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Parts

Zipp Vuka Aero Integrated Aerobar
$840.00
Vuka Aero is an integrated aero bar that can be used with any stem to help you find your ideal position on the bike. This bar is stiff and streamlined while maintaining the UCI's 3:1 aspect ratio requirement. - Removable center cap, placed in front of the stem, adds 5 percent stiffness to the aero bar and integrates seamlessly with the airfoil - Ships with base bar, extension clamps, armrest clamps, risers (two each of 5mm, 10mm, 25mm and 50mm risers), Vuka armrest pads, Vuka armrest and steel hardware - Clamp hardware and riser kits for the Vuka Aero are modeled after Zipp's pro-proven Vuka Stealth aero cockpit - Rapid Routing cable exits are positioned for easy installation of brake cables - 22.2mm extensions and stem not included - Extensions sold separately - Clamp Width: 54mm
Shimano Dura-Ace 9120 11-Speed Dual Control Levers w/Hydraulic Brakes
$378.99 - $828.99
- Quick And Intuitive Rear Shifting Operation - Shorter Lever Stroke - Redesigned Internal Shifting Unit - Lighter Front Shifting Operation - Redesign Front System With New Front Derailleur - Comfortable Grip And Operation - More Customizable And Precise Lever Position - Expanded Reach Adjustment Range (14 Mm) Mechanical Brake - Consistent Braking Performance In Any Condition - Easy Brake Control Hydraulic Brake
RockShox Reverb AXS
$800.00
Our intention with Reverb AXS was inventive and pure: No hoses. No routing. No energy wasted. Not a single thing in the way of the experience. We created a reliable wireless-electronic dropper post and controller that actuates with drastically less effort and zero distraction. Expanding what's possible on a bike, Reverb AXS is enabled by SRAM AXS technology, a new level of interaction, personalization, and connectivity across all AXS-enabled components. - Effortless Electronic-Wireless actuation and infinite height adjustment with a single touch. - Clean, simple and fast to install. No hoses to route, no fishing required. - Updated internals for faster return speed in all conditions. - New Vent Valve Technology, a simple and reliable built in service solution without disassembly of the seatpost. - SRAM AXS technology, a new level of interaction, personalization, and connectivity across all AXS-enabled components. - Includes RockShox AXS handlebar controller, rechargeable SRAM battery, and charger.
Campagnolo Super Record EPS Rear Derailleur
$780.00
Campagnolo's Super Record EPS Rear Derailleur's arresting beauty is entwined with the pinnacle in rear shifting accuracy and precision. Campagnolo uses an advanced-parallelogram design and the extremely high-quality servo motors for precise, fast shifting of up to all 11 gears from a single push of a button. Or stop on any cog and the position sensor makes micro-adjustments to ensure perfect alignment. And this top-tier Italian bike jewelry is constructed from carbon and cold-forged aluminum to create an ultra strong and extremely light derailleur. Plus, the pulleys roll on super-efficient ceramic bearings and are made from a special rubber that renders the drivetrain virtually silent.
Quarq DFour Power Meter Spider
$779.00
When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the DFour measures power in the heart of the bicycle—the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DFour Spider represents the state of the art in power meter technology - The DFour Spider is a bolt-on upgrade for Shimano’s 11-speed Dura-Ace 9000, Ultegra 6800 and 105 5800 chainrings. - Bluetooth low energy technology and ANT+ wireless data transfer. - 10K Temperature Compensation. - Battery - CR2032, 200-hour battery life, change without tools. - OmniCal - swap chainrings without affecting accuracy. - IPX7 waterproof rating. - Accuracy within 1.5%
Quarq DZero Aluminum Power Meter Chassis BB30
$779.00
When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the new DZero measures power in the heart of the bicycle — the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DZero represents the state-of-the-art in power meter technology As Quarq’s next generation of power meters, the DZero combines 10 years of technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app. - 10K temperature compensation: Eliminates variables caused by heat and cold to provide an unwavering record of your performance through all conditions - Built to last: Features an IPX7 waterproof rating - Bluetooth low energy technology and ANT+ wireless data transfer - Battery: CR2032, 200-hour battery life, change without tools - OmniCal: swap chainrings without affecting accuracy - 2-year warranty - IPX7 waterproof rating - Accuracy within 1.5% - Bottom Bracket Compatibility: BB30 - Forged aluminum models do not work with BBright or BB386EVO bottom brackets
Quarq DZero Power Meter Spider for Specialized
$779.00
DZero is Quarq's next-generation power meter platform for those who live to be challenged, pushed, and tested in the toughest scenarios imaginable. Now Quarq has introduced a DZero spider designed to replace the factory spider on Specialized's S-Works carbon crankset. Quarq DZero for Specialized embodies 10 years of Quarq advances in power meter technology, plus new features such as dual Bluetooth low energy and ANT+ wireless data transfer, revised circuitry, a new strain gauge design and the Qalvin BLE app. You also get AxCad accelerometer cadence, the easy-to-replace CR2032 battery, an IPX7 waterproof rating and a 2-year warranty. Features & Benefits: - Bluetooth low energy technology and ANT+ wireless data transfer - AxCad – no cadence magnet required - 10K Temperature Compensation - Battery – CR2032, 200-hour battery life, change without tools - Power Balance - OmniCal – swap chainrings without affecting accuracy - 2-year warranty - IPX7 waterproof rating - Accuracy – within 1.5%, measuring both legs - Free firmware upgrades with the Qalvin app Essential Details: - Traditional 5-arm spider compatible with Specialized S-Works Carbon Road Crank Arms from 2013-Current. - Available in 130 BCD and 110 BCD. - Replaces the standard spider. - A Specialized lockring tool is required for installation.
Campagnolo Super Record EPS Braze-On Front Derailleur
$735.00
Campagnolo's Super Record EPS Braze-On Front Derailleur delivers electronic precision to your front shifts. Hammer into the big ring and surge forward with a mere touch of a button, under heavy load or out of the saddle it's still as smooth as a dream. An aluminum internal cage plate and external carbon cage is powered by a servo motor to provide the incredibly quick shifting. It's versatile too, working with both standard and compact cranksets and auto-trimming to eliminate chain rub. - Drivetrain speeds: 11 - Derailleur capacity: 16T - Max ring (teeth): 55T - Double or triple: Double - Waterproof to 1 meter for 30 minutes (IP67 rated) - Weight: 127g
Campagnolo H11 Crankset
$720.00
Designed specifically for use with H11 groupsets. Full Carbon crank arms and spider are hollow for maximum stiffness and minimal weight. Utilizes USB ceramic ball bearings. Light weight hard anodized alloy chainrings and alloy chainring bolts. Utilizes Campagnolo's Ultra-Torque crank system. - Ultra-Torque axles couple together in the middle of the BB shell via a Hirth Joint that self centers the crank. This results in a very light weight and stiff system that transfers power to the pedals without power loss - Features Campagnolo X.P.S.S. (eXtreme Performance Shifting System) featuring geometrically optimized chainring teeth. Optimized when mated to a full Campagnolo drivetrain - USB ceramic bearings increase smoothness and decrease rolling resistance, weight and the need for maintenance. USB bearings are 50% smoother than standard Campagnolo bearings - Ultra-Torque system have both drive and non-drive side bearings pre-installed - Double standardized bolt circle diameter allows for use of standard, mid-compact and compact chainrings - Required for use with H11 Ergopower shift levers, the crank spider is shifted outward to adjust for 135 and 142mm hub spacing while maintaining the Q-Factor - Requires use of Ultra-Torque bottom bracket cups
RockShox Vivid Air R2C Rear Shock
$719.00
The RockShox Vivid Air R2C combines the consistent, supple feel of a coil shock, with the adjustability, tuning, and unparalleled weight savings of an air shock - a full 400 grams lighter than the Vivid Coil. The Twin Tube Solo Air lets you add air to your shock through a single Schrader valve, filling both the positive and negative air spring chambers simultaneously. This gives you a plush, predictable ride you can set up in seconds, with the lightest weight air spring on the market. And, Rapid Recovery allows the shock to recover faster between consecutive bumps, letting the wheel track the ground with greater precision. - Intended Use: Enduro, Downhill - Counter Measure for zero force stroke initiation - Dual Flow Adjust absorbs big hits while staying active through small hits - Switch for on the fly toggle between full and open compression - Eyelet Diameter: 12.7mm - Positive Spring: Air - External Adjustments: Rebound Damping, High Speed Compression Damping, Low Speed Compression Damping
RockShox Vivid Air R2C Shock
$719.00
Tipping the scales 400 grams lighter than the Vivid Coil, the new Vivid Air is so obscenely light weight, its destined to give other downhill shocks a body image complex. But don’t let its trim waistline fool you. This is no lightweight. With an all-new air spring system, this shock was built to take on the toughest courses on the World Cup circuit, combining the consistent, supple feel of a coil shock with the adjustability, tuning, and unparalleled weight savings of an air shock. The result? A shock that sets a new standard for downhill performance. - WEIGHT: 530g - DAMPING: External beginning stroke rebound, ending stroke rebound, low speed compression - CONFIGURATIONS: 200x57mm, 216x63mm, 222x70mm, 240x76mm - SPRING: Twin Tube Solo Air - SPRING ADJUST: Air pressure via single Schrader valve - SHAFT MATERIAL: 7075 aluminum - BODY MATERIAL: Aluminum - BODY FINISH: Hard anodized - OPTIONS: Optional decal colors: White, Black - OTHER: *Weight based on a 216x63mm without hardware
RockShox Bluto Suspension Fork
$715.00
RockShox started with the features you’ve come to love from them: Fast Black aluminum upper tubes, stout 15mm Maxle, remote or crown adjustable damping, tapered steerer tube, and the infinitely tunable Solo Air spring. Then, the chassis got the fat treatment by re-engineering it to meet the unique needs of fat tires and wheels. Everything from crown, to arch, to axle has been optimized to tackle the increased torsional loads of its wide stance. With more traction and control than ever before, you’ll never be happier you went fat. - TRAVEL: 80/100/120mm - WHEELS: 26-inch - AXLE TO CROWN: 491mm - 80mm travel, 511mm - 100mm travel, 531mm - 120mm travel - WEIGHT: 1796g (3.96lb) - DAMPING: RL - AVAILABLE SPRINGS: Solo Air - ADJUSTMENTS: Crown or remote compression to lockout, rebound - STEERER OPTIONS: Tapered aluminum - CROWN: Forged AL66 TV aluminum - UPPER TUBES: 32mm aluminum, Fast Black - LOWERS: Magnesium - MAXIMUM ROTOR SIZE: 200mm - COLOR OPTIONS: Black, Diffusion Black (OEM only), White (OEM only) - REMOTES: OneLoc - OTHER: Axle: 15x150mm Maxle Lite, Offset: 51mm, Brake Type: Disc
SRAM RED eTap AXS Rear Derailleur
$710.00
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
RockShox Yari RC
$700.00
Yari is for riders who aren’t afraid to go for it. For the ones who don’t know where the limit is, but are prepared to find out. The climbs, jumps, vistas, and natural terrain these riders encounter might be new to them, but they want to experience them all. Yari has confidence inspiring strength and stiffness as well as trail fork-versatility. So riders who are constantly testing their own limits, can be confident they’re within Yari’s.
SRAM X01 Eagle AXS Rear Derailleur
$700.00
It's an all-new derailleur that's specifically designed and optimized to be motor-driven instead of cable-actuated. AXS powered components enable customization and scale to an individual rider's liking via the AXS App. 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. The Eagle AXS derailleur is smart enough to protect itself thanks to its incredibly resilient Overload Clutch. In the event of an impact, the motor gearbox disengages, giving the derailleur freedom to move, and instantly returns back to its position for a seamless experience for the rider. The system is tested to IP69K water and dust proofing standard for creek crossings, mud splatterings and the resulting post-ride pressure washings. - Enduro focus and trail ready - Forged aluminum cage - Stainless hardware - Black/Polar colorways - 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.
SRAM XX1 Eagle AXS Rear Derailleur
$700.00
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
Shimano Ultegra R785 Di2/Hydraulic Shifters w/BR-RS785 Brake Calipers
$699.99
• Comfortable And Natural Hand Position For All Day Riding Comfort • More Stopping Power, With Less Effort, Especially From The Hood Position • High Braking Power Ideal For Cyclocross And On-Road Riding • Fits A Wide Variety Of Hand Sizes From The Hood Position • Electronic 11-speed Shifting Function Based Shift / Brake Lever Allows For More Compact, More Ergonomic Hood And Lever Design • Reservoir Tank Provides Pad Clearance Auto-Adjust To Maintain Consistent Pad Clearance • Both Lever Reach Adjust And Free Stroke Adjust Possible • Includes Shimano RS785 hydraulic road brake calipers • Includes Shimano SM-BH-59 hydraulic line kit and Shimano Mineral Oil
Cane Creek DBair CS Rear Shock
$695.00
No one knows your ride better than you. The DBAIR was built upon the Double Barrel legacy to become the first air-sprung rear shock featuring Twin Tube technology and 4-way independent adjustability combined with an unrivaled level of quality. The DBAIR enables custom, rider-tuned damping performance, optimizing every bike for every rider. Cane Creek’s all new CS is the most innovative climbing feature available. Traditional climbing modes only address half of climbing dynamics, requiring the rider’s body to respond to the rest. Double Barrel CS provides climbing-specific damping in both compression and rebound. Keeping suspension fully active while you climb results in better connection to the trail and increased efficiency without annoying pedal-bob. When you’re ready to descend, it’s all Double Barrel. After all, what goes up MUST go down… DOUBLE BARREL TWIN TUBE TECHNOLOGY Exclusive Twin Tube Technology circulates oil continuously through the damping valving to achieve highly controllable, independent damping for both compression and rebound strokes. This unique design moves oil through externally adjustable valving instead of the main piston, allowing for superior tunability and eliminating the need for internal valving changes to achieve proper shock setup. CLIMBING SWITCH TECHNOLOGY CS is the most innovative climbing feature available. This proprietary climbing feature (patent-pending) for Double Barrel shocks alters the entire low frequency dynamic response of the shock to specifically address the demands of ascending on a bicycle. WEIGHT - ~509 grams (weight varies by size) DAMPING - Twin-tube independent compression and rebound in two high-speed and four low-speed damping circuits ADJUSTMENTS - 4-way independent adjustment: - High speed compression - Low speed compression - High speed rebound - Low speed rebound - Air spring rate SHAFT MATERIAL - Aluminum 7075 SHAFT DIAMETER - 8mm FINISH - Anodized and laser-etched MOUNTING INTERFACE - Norglide bushing 1/2" Universal Axle CAN SIZE - Standard (All Lengths), Extra Volume (200, 216, 222, 240)
SRAM RED 1x Crankset
$690.00
Triathlon. Time Trial. Cyclocross. Some disciplines are made for 1x. And while SRAM's X-Range 2x set up has integrated much of the simplicity of a 1x system, there are still times when a single ring is best. The SRAM RED 1 crankset offers the most demanding racers the right mix of features—aerodynamics, durability, and simplicity. - Single-ring drivetrain simplifies functionality and reduces weight - 48 and 50t variants feature direct mount aero chainrings for better aerodynamics - Non-aero chainrings can be installed with a single tool, making gearing changes a breeze - SRAM X-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain control - Laser-etched chainring finish is more durable - DUB bottom bracket adds durability and simplicity - Can be upgraded to a power meter - Version: D1
SRAM RED DUB Crankset
$690.00
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. - 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 - Can be upgraded to a power meter - Version: D1
Shimano Dura-Ace 9150 Di2 11-Speed Dual Control Levers
$334.99 - $685.99
- More Control And Confidence In Race Conditions - Optimally Balanced Hydraulic Brake System For Racing - Dedicated Brake Lever Shape, Stroke, Contact Point, Stiffness And Dedicated Shift Paddles - Light Weight - Carbon Composite Plastic Material Of Hood - More Intuitive, Quicker Shifting Operation - More Defined Click Feeling And Ergonomic Shift Lever Position - Customizable Function To Fit Any Riding Style - Each Switch Has The Option For Multi-Shift On Or Off - E-Tube Project - Optimum Power Transmitted With Grip Firmly - Ideal Ergonomic Cover Shape With Better Thickness & Tenderness - Openable Hood Cover - Simple Set Up And Maintenance - Easy Replace Hood Cover - Openable Hood Cover - Customizable The Function To Fit In Rider'S Riding Style
Shimano Dura-Ace Di2 Dual Control Levers
$339.99 - $684.99
Flawless shifting, superb ergonomics, and state of the art technology? Shimano's Dura-Ace Di2 Dual Control Levers embody all of these concepts. Utter simplicity and ease of use are the hallmarks of these shifters, with gracefully curved lever blades that offer two, easy-to-reach fingertip buttons. The shifting controls are easily accessible from either the hoods or the drops, so you'll have total control from any position on your handlebar. The E-Tube wiring harness is simple, clean, totally waterproof, and runs beneath the bar tape for a super clean look.
SRAM RED eTap Rear Derailleur
$649.00 - $670.00
The SRAM RED eTap rear derailleur executes shifts the instant you demand it, with military precision. Wirelessly. It’s easy to set up, clean in appearance and delightfully uncomplicated. Mechanical necessities such as a carbon pulley cage, ceramic pulley bearings, and anodized alloy artfully blend with proprietary electronic advancements to deliver a shifting wonder. - Compatible with SRAM RED eTap shift/brake controls - Max tooth size: short-cage - 28T; mid (WiFLi) cage - 32t - SRAM RED eTap shifting logic - Wireless connection via AIREA network for fast and clean installation - Exact Actuation provides precise gear selections - Designed to work with SRAM PowerGlide and PowerdomeX cassettes - Speeds: 11-speed - Weight: 239 grams (short cage with battery) - Outer Cage: Carbon - Compatibility: SRAM RED eTap, PowerdomeX & PowerGlide Cassette - Inner Cage: Carbon - Finish: Black - Pulleys: Ceramic - Pull: Exact Actuation
Shimano Dura-Ace 9150 Di2 11-Speed Rear Derailleur
$659.99
- Ergonomic Shifting Operation Without Stress - Shimano Synchronized Shift - Low Profile Rear Derailleur Design - Shimano Shadow Rd - Race Endurance For Less Damage In Crush - Maintains Compact And Smooth Appearance - Maximum Sprocket: 30T - Minimum Sprocket: 11T - Maximum Front Difference: 16T - Total Capacity: 35T
Pro Missile EVO Carbon Basebar
$649.99
The Missile EVO is a full UD Carbon aerodynamic design that meets UCI requirements. It's ideal for applications where optimizing aerodynamics is critical. - Perfectly match with Missile EVO clip-on aero extenders - Including 4 spacer adapters for under bar and top bar mounting - Ideally paired with the Missile EVO stem for optimal aerodynamics and optics - Weight: 295g
FSA PowerBox Alloy Road Crankset
$648.99
FSA’s Road PowerBox Alloy Crankset employs a P2M convertible spider design for multiple chainring options. FSA's alloy arms and BB386EVO spindle mated together produce a very lightweight, extremely versatile power meter crankset available with a double chaining configuration. Firmware upgrades available for more features. - Cold forged AL6061/T6 aluminum crank arms - BB386EVO 30mm AL 7050 alloy spindle fits every frame (purchase BB separately) - AL7075 CNC chainrings - Chromoly chainring bolts - Fits Shimano and SRAM 10-11 speed systems - Spider-based power sensors provide total power output measurement of both legs, with Left & Right leg output analysis available with system upgrade - Bluetooth connectivity available with system upgrade - Battery life is approximately 300-400 hours - Easy-to-replace CR2450 battery
Shimano XTR Di2 Rear Derailleur (Long Cage)
$630.99
Shimano's unbelievable Di2 technology has made the leap to the trails with their XTR Di2 drivetrain. This rear derailleur features all of the race-day performance you've come to expect from XTR, and the unrivaled stability, speed, and performance of an electronic drivetrain. Since there aren't any cables to stretch or housing to create friction, shift performance stays amazingly perfect, delivering flawless shifts any time, under any condition. System communication with the front derailleur eliminates chain rub and, if you prefer, the rear derailleur can be optimized to use Shimano's Synchronized Shift technology.
Shimano XTR Di2 Rear Derailleur (Medium Cage)
$630.99
Shimano's unbelievable Di2 technology has made the leap to the trails with their XTR Di2 drivetrain. This rear derailleur features all of the race-day performance you've come to expect from XTR, and the unrivaled stability, speed, and performance of an electronic drivetrain. Since there aren't any cables to stretch or housing to create friction, shift performance stays amazingly perfect, delivering flawless shifts any time, under any condition. System communication with the front derailleur eliminates chain rub and, if you prefer, the rear derailleur can be optimized to use Shimano's Synchronized Shift technology.
Pioneer Shimano Dura Ace 9000 Single Leg Power Meter
$629.99
Pioneer's Shimano Dura Ace 9000 Power Meter is a revolutionary power meter that attaches stealthily to the left crankarm. The Dura Ace 9000 left crank arm meter allows every rider power-based (also called watt-based) training performance, allowing you to fine-tune your pedaling to find race-winning form without breaking the bank. With advanced technology accurate to +/- 2%, ANT+ transmitting, active temperature compensation, and a mere 22 grams of weight, the Pioneer power meter is perfect for any cyclist. Additionally, installation is fast, simple, and clean with zero wires, magnets, or zip ties. If you find yourself addicted to the data and crave more, upgrade kits that retroactively add drive-side power are available (sold separately).
Campagnolo Record EPS Rear Derailleur
$625.00
Italian beauty meets electronic precision in Campagnolo's brilliant Record EPS Rear Derailleur. Campagnolo uses an advanced parallelogram design for impeccable, lightning-fast shifting of up to all 11 gears with a single button push. Stop on any gear in between and the position sensor makes micro-adjustments to ensure perfect alignment every time. The construction pairs carbon and cold-forged aluminum to create an ultra strong and extremely light derailleur. Plus, the pulleys roll on super-efficient ceramic bearings and are made from a special rubber that renders the drivetrain virtually silent.