Skip to main content

Filter By:

  • Show More Brands

  • Show Fewer Brands
  • Show More Sizes
  • Show Fewer Sizes
  • Show More Model Years
  • Show Fewer Model Years

Parts

$1,099.99
Rally RK200 is tested to the extreme, so you can ride there too. This dual-sensing power meter delivers reliable power measurements and is easy to transfer between bikes, no matter what bike you're on or where you're riding. - Impeccably Designed Pedal—Rally power meters have undergone rigorous testing to ensure total reliability. Featuring a superior design with sensors housed inside, these sleek pedals install like any pedal. And they're quick to transfer between bikes. - Advanced Cycling Dynamics—In addition to total power and cadence, Rally RK200 measures much more. These metrics help you tailor your training around your specific weaknesses and strengths to help you improve. - Left/Right Balance—Measure power from your left leg versus power from your right leg to get a better look at how symmetrically you're producing power. - Seated vs. Standing—Track the amount of time you spend in each position and gauge position effectiveness. - Power Phase—Get a clear look at where you're producing power in the pedal stroke. - Platform Center Offset—Ensure proper cleat position by keeping track of where power is applied on the pedal. - Cleat Compatibility—For a comfortable ride, these pedals are designed with your favorite LOOK KEO cleats in mind. - Transferable Spindle—From road to gravel to cyclocross and much more, keep riding year-round. A transferable spindle can be installed in Rally RS road or Rally XC off-road pedal body kits (each sold separately). - Battery Life—Make sure you're ready for those long rides and training sessions with up to 120 hours of battery life. Specs: - Battery type: LR44/SR44 (x4) or CR1/3N (x2) - Battery life: up to 120 hours - Maximum rider weight: 105kg - Accuracy: +/- 1% - Field calibration - Adjustable release tension - Measurement location: spindle - Communication: ANT+ and BLUETOOTH - Weight: 326g - Water resistance: IPX7 - Cleat type: KEO - Q-factor: 53mm (55mm with provided 2mm washer) - Stack height: 12.2mm In the Box: - Rally RK200 pedals - Cleat hardware - 55mm Q-factor washers - Documentation
$1,099.99
Rally RS200 is tested to the extreme, so you can ride there too. This dual-sensing power meter delivers reliable power measurements and is easy to transfer between bikes, no matter what bike you're on or where you're riding. - Impeccably Designed Pedal—Rally power meters have undergone rigorous testing to ensure total reliability. Featuring a superior design with sensors housed inside, these sleek pedals install like any pedal. And they're quick to transfer between bikes. - Advanced Cycling Dynamics—In addition to total power and cadence, Rally RS200 measures much more. These metrics help you tailor your training around your specific weaknesses and strengths to help you improve. - Left/Right Balance—Measure power from your left leg versus power from your right leg to get a better look at how symmetrically you're producing power. - Seated vs. Standing—Track the amount of time you spend in each position and gauge position effectiveness. - Power Phase—Get a clear look at where you're producing power in the pedal stroke. - Platform Center Offset—Ensure proper cleat position by keeping track of where power is applied on the pedal. - Cleat Compatibility—For a comfortable ride, these pedals are designed with your favorite Shimano SPD-SL cleats in mind. - Transferable Spindle—From road to gravel to cyclocross and much more, keep riding year-round. A transferable spindle can be installed in Rally RS road or Rally XC off-road pedal body kits (each sold separately). - Battery Life—Make sure you're ready for those long rides and training sessions with up to 120 hours of battery life. Specs: - Battery type: LR44/SR44 (x4) or CR1/3N (x2) - Battery life: up to 120 hours - Maximum rider weight: 105kg - Accuracy: +/- 1% - Field calibration - Adjustable release tension - Measurement location: spindle - Communication: ANT+ and BLUETOOTH - Weight: 320g - Water resistance: IPX7 - Cleat type: SPD-SL - Q-factor: 53mm (55mm with provided 2mm washer) - Stack height: 12.2mm In the Box: - Rally RS200 pedals - Cleat hardware - 55mm Q-factor washers - Documentation
$1,099.00
The drivetrain embraced by core riders as the All Day best friend is now available in Transmission. The no-compromise, budget minded ethos remains built into the system but is modernized for a new generation of bikes. The GX Eagle Transmission derailleur every bit as crisp and precise as the other derailleurs in the transmission family, but features things like removable skid plates for better protection and serviceability. Shifting under load is made possible on the GX cassette due to a combination of X-SYNC technology and cassette mapping, creating seamless shifts even during your hardest power output. The GX Eagle Transmission DUB crankset stands apart and gives no-nonsense riders a no-compromise balance of form and function. It’s the crankset where pure performance meets optimal value. Its unique shape has been forged out of aluminum for strength without bulk. Its available composite removable bashguards add functionality and lets riders manage scuffs and scrapes that come with the territory. The GX Eagle Transmission (T-Type) chain is the strongest we have ever made. Specifically engineered to optimize Eagle Transmission, this all-new T-Type design features a unique flat top, and is developed specifically for the added torque loads of E-MTB thanks to its solid pins that give it incredible strength. - Available with 165, 170, 175mm crankarm and 32T chainring - Bashguard compatible - GX Eagle Transmission derailleur - 10-52T GX Eagle Transmission cassette - GX Transmission Flattop chain - Pod controller - AXS battery/charger
$1,089.00
The 34 Step-Cast Factory is the choice for riders who want an all-round fork that performs in a vast range of applications: lightweight for climbs and highly capable for demanding terrain with enough travel to instill confidence when the trail gets rough. Weight savings are attributed to external lower casting steps, hollow lower section, and shortened shaft lengths. - Step-Cast chassis - Genuine Kashima Coating on upper tubes - FIT4 damper and FLOAT EVOL air spring - Dedicated air spring and damper tune are specific for this travel range, with a lighter tune at mid and higher velocities
$1,089.00
The 34 Step-Cast Factory is the choice for riders who want an all-round fork that performs in a vast range of applications: lightweight for climbs and highly capable for demanding terrain with enough travel to instill confidence when the trail gets rough. Weight savings are attributed to external lower casting steps, hollow lower section, and shortened shaft lengths. - Step-Cast chassis - Genuine Kashima Coating on upper tubes - FIT4 damper and FLOAT EVOL air spring - Dedicated air spring and damper tune are specific for this travel range, with a lighter tune at mid and higher velocities - Kabolt Thru Axle
$1,079.00
Own the mountain with the award-winning 36 Factory, featuring high- and low-speed rebound adjuster, improved compression damping and reduced friction for unmatched performance and adjustability. - Genuine Kashima Coating on upper tubes - FIT damper and FLOAT EVOL air spring - Low friction seals for improved performance - Lower Leg Bleeders and Bypass Channels - Floating axles for perfect alignment - Updated Crown Design saves up to 20 grams, and offers significant structural improvements
$1,055.00
XC spec and ready for the trail. XX1 Eagle AXS utilizes the proven backbone of SRAM 1X. With the lightest weight materials and a 520-percent gear range. More secure and longer wearing X-SYNC 2 chainring. The pinnacle of performance, paired with the connected components of Eagle AXS. Ready for the new gen of super bikes. - XC focus - Carbon cage - Ti hardware Includes: - Rear Derailleur with Battery and Battery Protector - Rocker Paddle Controller with Clamp - Charger/Cord - Chain Gap Tool
$700.00 - $1,033.95 $1,033.95 - $1,200.00 Up to 42% Off
The new Super Record 12x2 Speed crankset: an intense concentration of innovation that results in the greatest possible stiffness and precision in derailing, whilst providing a dedicated aerodynamic “super design." The new carbon fiber Super Record 12x2 Speed crankset has been made lighter on the inside through Campagnolo Hollow Technology, which uses the Ultra-Torque bracket system with a titanium axle to transfer all of the force the athlete applies to the pedal to the drivetrain. The new Super Record 12x2 Speed crankset can be installed on any type of frame, whether or not it is being used with disc brakes because it optimizes the chain line on the frame with a rear hub flange measuring 130, 135 or 142 millimeters, without affecting the Q factor, which remains constant at 145.5 millimeters thanks to the new hand crank design. The use of ceramic Cult bearings leads to obtaining the smooth ride that the Campagnolo brand is known for. The innovative design of the outer chainring ensures faster, quieter derailing owing to the contoured pin. The symmetrical design of the inner chainring teeth allows improved stability with chain crossovers. The double wheel sizing standards (112 and 145 millimeters) combined with the eight fixing screws, optimize weight and stiffness through the increased use of carbon fiber. The varying number of pins for each of the three chainring combinations (34/50, 36/52, 39/53) facilitates upshifting due to the optimized free strokes associated with each combination. The special drains on the inside of the outer chainrings optimize performance when downshifting in dead spots.
$989.00
The 38 Performance Series forks retain the same black anodized 7000 series aluminum upper tubes as Performance Elite, except paired with a GRIP damper. Push-button bleeders are not included but can be purchased separately. - Black anodized upper tubes - FIT GRIP damper and FLOAT EVOL air spring - Three on-the-fly compression damping positions: Open, Medium, Firm - Performance Series black-on-black graphics package
$968.00
Zipp’s Vuka Aero redefines aero handlebar conventions while being compatible with modern-day aero bikes. The current redesigned Vuka Aero builds on the technological foundation of aero excellence set by the original version. Vuka Aero is an integrated aero bar that features market-leading adjustability; it can be used with any stem to help you find your ideal position on the bike. The airfoil used in the Vuka Aero is based on the shape of the SL-70 Aero road bar. The result is an aero bar that’s stiff and streamlined while maintaining the UCI’s 3:1 aspect ratio requirement. - Market-leading adjustability in pad fore-aft, width, height, and angle - Integrated Carbon Aerobar works with any 31.8mm clamp stem - Integrated SRAM eTap AXS Blip box mount in the Center Cap - Rapid Routing cable exits are positioned for easy installation of brake cables - Vuka Aero ships with base bar, extension clamp, and armrest clamp - Extensions sold separately
$950.00
The XX Eagle T-Type AXS™ Power Meter Wide carbon crankset boasts SRAM's XX T-Type crank arm with an integrated power meter to record and deliver live, accurate power readings to your head unit. Utilizing an all-new spider-based design, this is SRAM's most accurate, high performing power meter. The new spider design uses a proprietary chainring mount system which allows reduced weight without compromising reliability. A dual sided power measurement system calculates total watts - it’s subtle, lightweight, and boasts an extra long battery life. It is also compatible with the RockShox Flight Attendant system, allowing for total connectivity between all AXS™ enabled components. No-compromise, high-performance data delivery giving you an edge over the competition.
$949.00
Competition drives innovation, and as cross-country athletes and course designers push the boundaries of lightweight components, 32 Step-Cast Factory rises to meet the demand. A redesigned crown for 2020 increases stiffness to the same level as the trail-proven 34. The distinct shape of the Step-Cast chassis uses a narrow stance to save weight and the step design makes room for the spokes and brake rotor. - Genuine Kashima Coating on upper tubes - 32 mm upper tubes and ample bushing overlap for a quality ride - Hollowed out lower legs provide even more weight savings - FIT4 damper and FLOAT air spring
$930.00
The RockShox SID SL Ultimate BRAIN incorporates a race-tuned Brain Inertia Valve with Position-Sensitive technology into the all-new RockShox SID SL chassis. New Position-Sensitive Brain technology provides more platform support while maintaining small bump compliance and chassis balance, making this the most efficient BRAIN yet. Position-Sensitive technology allows riders to sag into the fork 15mm for a balanced ride, providing supple small bump compliance and a firm pedaling platform without the need for a remote lockout or levers to flip. All new SID SL Ultimate Chassis features a machined alloy crown to shed even more weight while increasing stiffness. - New Position-Sensitive tune provides an increase in platform support. - New SID SL Ultimate chassis features increased stiffness, lighter weight, and reduced friction. - Torque cap compatible for stiff dropout/hub interface. - 100mm travel, 44mm offset, 110mmx15mm hub spacing.
$919.00
THE HARD CHARGING DO IT ALL TRAIL FORK Smoother, lighter, more tunable, and more capable than ever before; when it comes to a do-it-all trail fork the 34 is in a class of its own. - LOWER LEG BYPASS CHANNELS As a fork compresses, the air volume within the lower legs decreases, increasing air pressure. The more the fork compresses, the more pressure increases. This effect can have the unintended consequence of preventing full travel from being achieved. Our lower leg channels help alleviate this issue by dramatically increasing air volume within the lower legs and thereby reducing the amount of additional unintended pressure ramping. - LOWER LEG ARCH Stiffness-to-weight is the ultimate metric for bicycle design. Engineers invest countless hours poring over every ounce of material in an effort to optimize this critical ratio. The all-new 34 pulls out all the stops, shaving every possible gram while making sure not to compromise the stiffness or strength requirements of modern trail riding. - GRIP2 Our GRIP2 damper is the benchmark for unparalleled ride quality and ultra-precise adjustability. GRIP2 includes our patented Variable Valve Control (VVC) technology which allows for external fine-tuning of suspension performance. GRIP2 achieves with the twist of a knob what typically requires the time consuming and complicated task of completely disassembling and reassembling the fork. -FLOAT EVOL Returning with the same legendary suppleness and longevity, the EVOL air spring in 34’s now has an enlarged negative air spring to assist with mid-stroke support. - Performance-Elite series with black anodized stanchions - Step Cast (SC) legs with narrow stance and stepped design to saves weight, decrease frontal area, and provide clearance for the spokes and brake rotor - FIT4 damper with 3-position damper control - 160mm to 203mm rotor compatible post mount - Lightweight Kabolt thru-axle - Tapered threadless steerer
$881.00
- AXS enabled for easy monitoring and firmware upgrades - Fully integrated power meter into a direct mount chainring - Power readings are accurate within +/-1.5% and aren't affected by climate conditions during a ride - Power balance measures left and right legs separately - SRAM X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain control - Laser-etched chainring finish is more durable - 8-bolt direct mount compatibility only to RED and Force eTap AXS cranks. - Speeds: 12 - Chainring material: Aluminum - Power Meter Type: ANT USB
$849.00
The 34 Step-Cast Performance is the choice for riders who want an all-round fork that performs in a vast range of applications: lightweight for climbs and highly capable for demanding terrain with enough travel to instill confidence when the trail gets rough. Weight savings are attributed to external lower casting steps, hollow lower section, and shortened shaft lengths. - Step-Cast chassis - Black anodized upper tubes - FIT GRIP damper and FLOAT EVOL air spring - Dedicated air spring and damper tune are specific for this travel range, with a lighter tune at mid and higher velocities - Performance Series black-on-black graphics package
$844.00
X01 Eagle is the drivetrain for riders and racers who push for the purpose of gaining elevation. Whether having fun, progressing skills, or taking the win, X01 Eagle is designed and refined to support riders with the power of expanded capability. Includes: - Rear Derailleur with Battery and Battery Protector - Rocker Paddle Controller with Clamp - Charger/Cord - Chain Gap Tool
$814.99
The Shimano Dura-Ace RD-R9250 rear derailleur integrates the system charging port and a wireless connectivity unit all while delivering super fast, precise shifting worthy of any podium. A single cage length shifts cassettes from 11-28 to 11-34, offering exceptional versatility. - Ultra-fast rear Di2 shifting - Compact design includes an integrated wireless unit, charger, switch - Wider range capacity - Max. low sprocket: 34t - CFRP rear derailleur plate - LED status indicator - Battery indicator, pairing, adjust mode etc.
$729.99 - $779.99
The DB Kitsuma shock was designed to be very intuitive and easy to use for the rider, on and off the trail. It boasts a wider range of damping adjustment on the compression circuit and increased range of rebound control over any other major shock on the market today. - Three Position Climb Switch provides three distinct modes, drastically affecting the shock's feel and character. The new three position climb switch retains the "Descend" and patented "CS" mode, while adding a new "Firm" mode - Tool-Free adjustments are ergonomically designed to be easily accessible and adjustable trail-side—giving riders the power of a pro-tune at their fingertips - The rebound range has been shifted downward for more rebound damping to accommodate the larger spring rates needed for more modern bikes
$779.99
The DB Kitsuma shock was designed to be very intuitive and easy to use for the rider, on and off the trail. It boasts a wider range of damping adjustment on the compression circuit and increased range of rebound control over any other major shock on the market today. - Three Position Climb Switch provides three distinct modes, drastically affecting the shock's feel and character. The new three position climb switch retains the "Descend" and patented "CS" mode, while adding a new "Firm" mode - Tool-Free adjustments are ergonomically designed to be easily accessible and adjustable trail-side—giving riders the power of a pro-tune at their fingertips - The rebound range has been shifted downward for more rebound damping to accommodate the larger spring rates needed for more modern bikes - Trunnion Mount
$779.00
Riders have been asking for it, and Marzocchi heard the call and has proudly delivered. The new Z1 Coil builds on the legacy of the single-crown fork that started the revolution way back in the '90s – the O.G. Bomber Z1 Coil. Starting with the stout and proven 36mm chassis of the modern day Bomber Z1, the new Z1 Coil retains the renowned Grip damper but swaps out the air spring assembly for the most advanced coil spring system Marzocchi has ever made. At the heart of this new coil system is an ultra-lightweight tempered silicon-chromium steel spring (available in 4 spring rates to suit a wide range of riders) coupled with a noise management system for near silent performance, an integrated air assist for progressivity and bottom-out control, and an external preload adjuster to dial in sag and firmness off the top. Travel can easily be changed in 10mm increments from 150-180mm (depending on wheel size) via included reconfigurable internal spacers. - Ultra-lightweight tempered silicon-chromium steel spring (Medium Spring included) - Noise management system for near silent performance - Integrated air assist for progressivity and bottom-out control - External preload adjuster to dial-in sag and firmness off the top - Travel can easily be changed in 10mm increments from 150-180mm (depending on wheel size) via included reconfigurable internal spacers - Additional springs sold separately to fine-tune and adjust for rider preference - Rake: 44mm
$769.00
Competition drives innovation, and as cross-country athletes and course designers push the boundaries of lightweight components, 32 Step-Cast Performance rises to meet the demand. A redesigned crown for 2020 increases stiffness to the same level as the trail-proven 34. The distinct shape of the Step-Cast chassis uses a narrow stance to save weight and the step design makes room for the spokes and brake rotor. - Black anodized upper tubes - 32 mm upper tubes and ample bushing overlap for a quality ride - Hollowed out lower legs provide even more weight savings - FIT GRIP damper and FLOAT air spring - Performance Series black-on-black graphics package
$769.00
Competition drives innovation, and as cross-country athletes and course designers push the boundaries of lightweight components, 32 Step-Cast Performance rises to meet the demand. A redesigned crown for 2020 increases stiffness to the same level as the trail-proven 34. The distinct shape of the Step-Cast chassis uses a narrow stance to save weight and the step design makes room for the spokes and brake rotor. - Black anodized upper tubes - 32 mm upper tubes and ample bushing overlap for a quality ride - Hollowed out lower legs provide even more weight savings - FIT GRIP damper and FLOAT air spring - Performance Series black-on-black graphics package
$768.99
The ergonomics on the Shimano Dura-Ace ST-R9270 dual control levers bring new levels of comfort and control to road cycling. With fast wireless shifting and precise brake modulation, Dura-Ace redefines performance. The Dura-Ace BR-R9270 hydraulic 2-piston calipers are sleek and compact. Mono-body construction ensures light weight and rigidity, proving that good things can come in small packages. - The wireless connection provides a clean cockpit, enhancing the aesthetic of your bike while keeping shifting lightning fast - 1.5 to 2 years of battery life with easy-to-change CR1632 shifter batteries - Wider pad clearance decreases the chance of rotor rub - Raised hood peak improves ergonomics, while a longer hood body increases hand support - Compatible with satellite shifters - Maintenance-friendly bleeding process
$753.00
More than a mechanical derailleur with a battery and a motor bolted on, the Eagle AXS derailleur is the heart of the whole AXS system. It features a shorter cage for 10mm more ground clearance, with more chain wrap on the cassette to sit slightly further forward, and further inboard from mechanical Eagle. Instantaneous shifts from a single touch even while under World Cup-winning chain loads recorded in the heat of racing and affirmed in the test lab. Tested to IP69K water and dust proofing standard so whatever race day brings, you’re ready. - XC focus and trail ready - Carbon cage - Ti hardware - Rainbow colorway - Eagle technology - Overload Clutch protection - AXS enabled componentry software that makes it possible to both program and personalize new SRAM and RockShox components - System is completely water and dust proof to IP69K - Eagle AXS is designed to work with X-DOME Eagle cassettes only, providing the most precise, silent, and reliable shift performance available. - Battery sold separately
$750.00
The Campagnolo Super Record EPS 12 speed rear derailleur offers improved shifting performance with a trajectory curve that is optimized for 11-29 and 11-32 cassettes. - Using 3D Embrace technology the inner mechanism embraces more teeth per sprocket thanks to the advanced position of the upper pulley - The 12-tooth pulley wheels allow for the integration of larger cassette range while keeping chain length the same - Upper body adjustments allow you to set the perfect position whether you're riding an 11-29 or 11-32 tooth cassette - An upper body return spring absorbs the energy of any bumps, preserving the hanger, and bringing the derailleur back to position - An aluminum upper body provides high resistance to impacts and greater stiffness - The lower part of the body is made of ultra-light technopolymer, reinforced with long carbon fibers Specifications: - Largest Cog: 32 - Rear Derailleur Mount Type: 10x1 Standard - Chain Wrap Capacity (teeth): 37 - Cage Length: Medium - Rear Der/Shifter Compatibility: Campy Record/Super Record EPS - Drivetrain Speeds: 12 - Weight: 234g
$750.00
If your ride doesn't feel complete until you get a little dirt on your tires, you know the importance of capable components that can tackle anything. The RED XPLR eTap AXS rear derailleur is a dedicated 1x-specific unit designed for use with the XPLR 10-44 cassette. It makes for an uncluttered drivetrain that takes on pavement and singletrack with equal aplomb. Wireless and proven eTap shift logic, AXS connectivity and advanced chain management mean this derailleur does exactly what you want when you need it. - Wireless electronic eTap shift logic for intuitive shifting, easy setup, and reliability - 1x specific for use with 10-44T XPLR and 10-36T cassettes - SRAM AXS enabled, allowing easy personalization - Chain management keeps the drivetrain quiet and secure - Large X-SYNC pulleys for increased durability and efficiency - Compatible with existing eTap batteries - Cage Material (RD): Aluminum - Pulley Bearings Material: Ceramic - Max Tooth: 44 NOTE: Does not include eTap battery. Compatible with existing eTap batteries.
$750.00
The heart of the connected cadre. The SRAM RED eTap AXS rear derailleur is AXS enabled for easy personalization and designed for both 1x and 2x systems. Advanced chain management keeps it silent and secure no matter the terrain. The derailleur also comes with faster pulleys, bearings, motors, and signals, improving speed in every way. - SRAM AXS-enabled for easy personalization - Orbit chain management technology keeps drivetrain quiet and secure - A single rear derailleur for all gearing combinations, including 1x and 2x - Improved motor and signal travel for faster shifting - Larger X-SYNC pulleys and ceramic bearings for increased durability and efficiency - Compatible with existing eTap batteries - Battery sold separately
$743.00
The SRAM RED crankset leverages a pivotal design innovation: smaller chainrings and a wider cassette range. This leads to smoother and faster shifting up front and more useful gearing for today's riders. The new configurations improve cadence and efficiency while also delivering shifts that are crisp, clean and quick-every time. Features - X-Range gearing technology gives you more range and a smoother gear progression, so you're always in the right gear - Improved front shifting performance for crisp and accurate front shifts - Unique chainring design results in a lighter weight, stiffer, more durable crankset - DUB bottom bracket adds durability, simplicity and broad compatibility - Power upgradeable Specifications - Speeds: 12 - BB Compatibility: All SRAM Road DUB BBs, GXP/PF GXP 68mm - Chainring Size: 46/33, 48/35, 50/37 - Crank arm length: 165mm, 167.5mm, 170mm, 172.5mm, 175mm - Chainline: 45.0mm - BB Spindle Interface: 24mm, DUB - Chainring material: Aluminum - Guard: No Guard - Bolt Circle Diameter (BCD): Direct Mount (DM) - Crank arm material: Carbon
$729.99
The DB Kitsuma shock was designed to be very intuitive and easy to use for the rider, on and off the trail. It boasts a wider range of damping adjustment on the compression circuit and increased range of rebound control over any other major shock on the market today. - Three Position Climb Switch provides three distinct modes, drastically affecting the shock's feel and character. The new three position climb switch retains the "Descend" and patented "CS" mode, while adding a new "Firm" mode - Tool-Free adjustments are ergonomically designed to be easily accessible and adjustable trail-side—giving riders the power of a pro-tune at their fingertips - The rebound range has been shifted downward for more rebound damping to accommodate the larger spring rates needed for more modern bikes