Parts

SRAM's CenterLine rotors are light-weight, quiet, smooth and robust, featuring a two-piece design with an aluminum center and steel brake track.

The original ergonomic grip. The GP1 sets the worldwide standard in ergonomic comfort, materials, and quality. The GP1 eliminates numb hands, aching fingers, and tired forearms. The uniquely shaped grip body is made from 100% German, TÜV-certified rubber compounds of the purest quality – with infused medical-grade white mineral oil for improved flexibility and durability. A forged aluminum clamp allows the grip to be adjusted for perfect fit, can be easily readjusted, and eliminates twisting once installed. - Carbon bar compatible - Uses: mountain biking, touring, commuting - Clamp: 100% recyclable aluminum

When it's time to replace your 9-speed cassette, check out SRAM's PG-950 cassette. It delivers solid shifting and durability ride in and ride out for your 9-speed rig.

Shimano's Tourney long cage rear derailleur incorporates advanced Shimano functions and styling that sets the standard for entry level components. - TY model comes with resin bracket and plate body for reduced weight - Zinc-plated adjustment screws for corrosion resistance - MegaRange compatible - Includes frame hanger - Maximum cog size: 34t - Total capacity: 43t

The Cascade dropper post pays homage to the Cascade mountain range, home to some of the best riding in the PNW. This post is a workhorse: it’s super reliable, loved by our customers, and now features multiple travel options. The Cascade provides dependable up and down service for the miles to come, and maintenance on the Cascade is easy (like all our droppers). Plus, external routing at the mid-cap ensures your cables are kept nice and tidy during up and down actuation. You can find sweet upgrades to the Cascade’s OG dropper design on the posts featuring 150/170mm of travel. These models have larger diameter stanchions, making them stiffer and lighter… which is sweet because who wants a bike part that’s heavy and too compliant? These longer travel models also come with an added DU bushing to combat seat wobble, because let's face it… the only thing that should be wobbly on your bike are your legs after a long ride. Levers: - Choose from our Loam Lever, Puget 1x or 2x drivetrain compatible levers, or Roadie/Drop Bar Lever Kit for road bars - 1x Lever - Designed to be used with bikes using a single front chainring, this is a "shifter style" lever - 2x lever - Designed to play nice with front shifters, this is a "vertical" lever that accommodates for the shifter on the left side of your handlebar Product Specs: - Choose any lever kit - 30.9 & 31.6mm Diameters - Weights: 125mm - 608g, 150mm - 613g, 170mm - 674g - 2-bolt Micro Adjust Head - Fixed External Routing at the Mid Cap for clean cable routing - 3-year warranty!

The Ergon GE1 Evo is the evolution of the GE1, a popular trail-oriented ergonomic grip for wide riser bars. Thanks to the feedback collected from countless Enduro World Series riders, the Ergon design team improved the GE1 by altering the compound to give a softer, more positive contact. It actively supports the correct torso/forearm position during downhill riding, offering greater control and protecting the sensitive ulnar nerve. Its forged inner clamp and fully integrated grip end connected to the inner core provides a soft, damping grip edge, comfortable right to the outer edge. These grips are compatible with carbon handlebars, so get a pair for race day and everyday. - Length: 135mm - Lock On: Yes - Weight: 105g

Whisky poured over every detail, pushed the limits, and broke new ground during the creation of the No.9 Fat Rigid Carbon Mountain Bike Fork. It eliminates uncomfortable chatter and vibration over rough terrain, so you experience an astoundingly plush ride with precise handling. They've accomplished this by using a delightfully stiff and compliant UD carbon fiber construction, a tapered steerer, and a 15 x 150mm thru-axle. It all results in an enhanced riding experience and adds up to performance that you can count on. - Post style brake mount - DT RWS Axle included - UD full carbon construction - Axle to Crown Length: 480mm - Brake Mount: Post Mount 160mm - Crown Race: 40 - Front Axle: 15 x 150mm - Material: Carbon - Offset: 51mm - S.H.I.S. Stem Clamp Diameter: 28.6 - Steerer Type: 1-1/8 – 1-1/2-inch tapered - Weight: 750 grams - Wheel Size: 26-inch

Shimano Altus M311 cranksets provide durability and reliable shifting for triple chainring drivetrains. - Hyperdrive SG-X chainrings - 7/8-speed compatible - Spindle interface type: Square Taper JIS

True competitors are always looking for a performance advantage — a relentless pursuit of equipment that is lighter, stiffer, stronger, and more durable. To create the best drivetrain possible, we re-examined and re-engineered our crankset design. Our all-new XX1 Eagle CARBON TUNED crankset is our lightest, stiffest, and strongest to date. DUB technology enhances this by simplifying the relationship of the spindle to the bottom bracket and redefining the measure of durability. DUB-powered cranksets mean simplicity, compatibility, and durability. Specifications: - CRANK ARM LENGTH: 165mm, 170mm, 175mm - BB SPINDLE INTERFACE: DUB - BB COMPATIBILITY: All SRAM MTB WIDE DUB BBs, DUB:BSA73, PF89.5, PF92, PF30 MTB73, BB30 MTB73, BSA MTB68SP - SPEEDS: 12 - CHAINRING MATERIAL: No rings - BOLT CIRCLE DIAMETER (BCD): Direct Mount (DM) - CHAINLINE: 55.0mm, n/a - CHAINRING SIZE: No rings

The Problem Solvers Handlebar Clamp Shim allows you to fit almost any handlebars in almost any stem. It's machined of light and durable aluminum and grooved on the inside to hold tightly.

- Economical resin pedals w/toe clips and straps - 9/16-inch Cr-Mo axles

- Compatible with 6 and 7-speed SIS Index Shifting drivetrains - Includes BMX/track frame hanger

The Shimano Claris ST-R2030 is a dual control brake/shift lever for Shimano 2x8 and 3x8 drivetrain applications. It features a reach adjust mechanism and Shimano's Super SLR friction-reducing technology. - Reach Adjust mechanism allows for the distance from the handlebar grip to the lever to be adjusted to suit any hand size or riding style - Super SLR technology improves braking response and modulation by reducing friction through the caliper, lever, and cable - The Dual Control Lever has both brake and shifting functions in the system to enable simple operation - Includes OT-SP41 cable housing to maximally reduce the inner cable friction for quick response to operations and effortless shifting

Shimano's In-Line Brake Cable Adjuster with quick release allows you to make changes to your road caliper brake's cable tension or open a brake caliper's arms to remove a wheel.

This mid-rise handlebar provides smooth lines and pure comfort - Black powder coat - 1"(25.4mm) clamp, 5.25" rise, 27" wide - Handmade in Maysville, Kentucky

• Washable surface • EVA integrated absorbs shock and increase comfort • Durable all conditions perforated surface for ventilation. • Includes Giant logo end-plugs and Giant finishing tape

Dimension Suspension Seatpost - Clamp Style: Std Rails - Diameter: 27.2mm - Length: 350mm - Material: Aluminum - Max Height: 255mm - Min Height: 130mm - Offset (mm): 0mm - Seatpost Type: Suspension - Travel (mm): 35mm - Weight: 450g

e*thirteen's Plus pedal features a lightweight aluminum pedal body and 22 traction pins. - Lightweight aluminum pedal body - 22 traction pins - 9/16"

The tool-free Maxle Lite brings exceptional stiffness and durability to your fork in a light, easiest-to-use expanding wedge thru-axle system. - Thread Length: 9mm - Thread Pitch: 15 x 1.5mm

A purpose built carbon fiber fork for gravel and cyclocross applications featuring internal hose routing, flat mount brake compatibility, and clearance for up to 50mm tires. This fork is perfect for gravel riders looking for more clearance, weight savings, compliance, and the versatility of fender mounts to enhance their gravel grinding experience. - Material: Carbon - Weight: 520g - Steer Tube Length: 350mm - Rake: 50mm - Axle To Crown: 395mm - Max Rotor Size: 140mm – 160mm - Max Tire Clearance: 700c x 50c, 27.5 x 2.25-inch - Crown Race Diameter: 1.5-inch - Torque Spec - Steer Tube: 5.5Nm - Torque Spec - Axle: 8Nm

SRAM's MRX Comp Twist Shifters are simple to use and offer solid shifting and reliable construction. Shifting one gear or the whole range is simple with just a twist of the wrist. They shift a 2:1 Shimano rear derailleur and a SRAM or Shimano derailleur up front.

SRAM's road chainrings are stamped from 7075 aluminum for low weight and excellent strength. The teeth are ramped for precision shifting, too.

- Compatible with Shimano, SRAM, Campagnolo and KMC 11 speed chains - DLC Coated - Non-reusable - Opening Tool Required - Card of 2 pairs

- Quarq D1 crank arm assembly - 8 bolt interface for use DZero DUB and DFour DUB power spiders

The pinnacle of cross-country cycling performance can be found in the SRAM XX SL T-Type Eagle AXS™ Transmission Groupset. Built to serve the most demanding rider’s needs in the lightest weight configuration, XX SL Transmission is the evolution of SRAM's World Champion, World Cup winning XX Eagle AXS™. - AXS™ Pod ULT features a “click and fire” two-button design that transforms the crucial act of rider inputs into a vastly more personal experience for all your AXS™ controls - Engineered as integrated, interdependent transmission components, the XX SL Eagle T-Type rear derailleur mounts around the wheel axle itself, contacting the cassette directly with a first-of-its-kind Hangerless Interface - XX SL T-Type derailleur offers the same intuitive pairing and set-up procedure as SRAM's Eagle AXS™ derailleur - To further its performance, the lower pulley called, "Magic Wheel", keeps spinning if an object becomes lodged - Features an overload clutch that accommodates common maintenance - Ultra-lightweight XX SL T-Type 10-52t cassette offers game-changing inboard and outboard shifting performance under load - One of the lightest ISO certified crank on the market, the XX SL T-Type carbon crank is maximized for title winning stiffness and features the remarkable XX SL Eagle T-Type direct mount chainring - XX SL Eagle T-Type Flattop Chain is specifically engineered to optimize Eagle Transmission and features a unique flat top that maximizes shifting performance and robustness

Long hours in the saddle? No problem with the SM Comp Men. This male-specific all-around MTB saddle is great for touring, trail and all-mountain riding. It offers the highest level of comfort through the anatomically optimized relief channel and orthopedic comfort padding. OrthoCell-Inlays in the seating area generate the best possible pressure distribution. The innovative OrthoCell material ensures maximum reset forces and is also more durable and lighter than gel. The flattened rear and the Y-shape guarantee full freedom of movement when in the typical MTB riding position. Sliding flanks help reduce friction when pedaling.

With a focus on reduced weight and cross-country tuned stopping power, Shimano SLX M7120 brakes provide intuitive modulation so that you can explore your limits with confidence. The BL-M7100 levers feature an optimized lever axle position, an additional handlebar contact point for greater stiffness, and refined ergonomics for rider comfort. At the caliper end, the BR-M7120 4-piston caliper is optimized for the toughest enduro trails. - 10% stiffer than previous generation M7000, even under high-temp conditions - Quicker brake engagement with shorter free stroke - Tool-free lever reach adjustment - I-SPEC EV Clamp Band enables optional integrated shifter setup - Includes finned metal pads

The tool-free Maxle Ultimate Front brings exceptional stiffness and durability to your ride in a high clamping force, easiest-to-use internal cam thru-axle system.

Choose from the many colors and add style to your ride with Origin-8's Compe-Lite Seat Post. It's crafted from light and durable 6000 aluminum, and features a single-bolt adjustable clamp for easy seat installation and fine-tuning.

The Crank Brothers Mallet E 11 is the premium version of the ideal enduro racing pedal. The specs say it all. - Titanium wings to reduce weight - Dual chamfered edges to reduce rock-strikes - Exclusive double-anodized black and gold colorway - Concave platform for secure foothold - 6 adjustable pins per side for grip - Traction pad technology to optimize the shoe/pedal interface - Ribbed body for better traction when unclipped - 52mm q-factor for maneuverability on tight trails - Hex alloy endcap for durability - 4-sided entry / superior mud shedding - Customizable float & release angle - Premium bearings & double seal system

Why We Make This: The simple answer is that many contemporary bicycle frame designs call for the headset bearings to ride inside the frame’s headtube. After decades of making press-in bearing headsets, we needed to make headsets that worked in these newer frames. From the beginning we understood that integrated headsets posed a unique challenge in that the bearings are not pressed into a cup and sit loosely in the frame. When bearings are not pressed securely into a cup they shift and move, rapidly losing preload. As preload drops, the bearings are more susceptible to creaking, damage, and failure. That’s a problem we know how to solve. Why You Want It: Enter, our patented GripLock™ bearing cap. The GripLock™ preloads the headset independently of clamping onto the steerer, so it retains preload far better than the competition and is impervious to the ill effects of load spikes from large hits and heavy braking. This means smoother steering, no more creaking, and a longer lasting headset. Our GripLock™ design also takes the guesswork out of preloading a headset, because the bearing preload force is independent of the clamping force. Our headsets can be preloaded to a torque spec. Compatible with Open, 3T, All City, Low, Cinelli, Lynskey, and more. - Engineered, manufactured and assembled in Portland, Oregon USA - King Lifetime Warranty - Legendary made-in-house bearings - Patented GripLock® retention design for dependable headset adjustment (US Patent 8662517) - 42mm 45x45 upper bearing for 2.8-3.0mm bearing ream depth. - 52mm 45x45 lower bearing - Compatible with our included baseplate and 45 degree integrated crown races

Replacement PowerGlide ring for 11 speed crankset. - Compatible with Asymmetrical Yaw front derailleurs - Bolt Circle Diameter (BCD): 110 BCD - Material: Aluminum

CenterLine X rotors are the lighter weight version of SRAM's quiet, smooth, and robust CenterLine rotors. The CenterLine X rotor features a two-piece design with an alloy center and steel brake track. Rounded edges make for easier wheel installs and are UCI-compliant. - Compatible with both road and mountain bike brakes - Lightweight, two-piece design - Rounded edges are UCI-compliant and allow for easier wheel installs - Hub interface: 6-bolt - Includes Steel rotor bolts

Shimano Deore XT RT-MT800 Center Lock disc brake rotors feature an advanced heat-dissipating design. - Rotor construction uses Shimano Freeza technology to boost heat dissipation and reduce fade - Quick and easy installation with spline mount and lock ring (included) - Compatible with metal and resin pads

- Powermeter Crank Arm Bolt Kit and AXS Cover Plug Drive Side M18/M30 Dub Steel Black Rival D1

SRAM's MRX Comp Twist Shifters are simple to use and offer solid shifting and reliable construction. They shift a 2:1 Shimano rear derailleur.

SRAM's PG-1030 10-Speed Cassette is a great choice. It's constructed of light and durable materials and boasts SRAM's PowerGlide tooth profiles and shift ramps for quick and positive gear changes every time. This trick cassette is available in four configurations perfect for riding off road, including one with a 36-tooth largest cog for super-easy climbing.

- MODEL NO: CS-HG400-9 - SERIES: SHIMANO ALIVIO M4000 Series - Compatible chain: HG 9-speed - Speeds: 9-speed - Type: HG

- Grade 10 chromium steel balls

Sometimes less is more. With the 10-speeds, an 11-48T range, and evenly spaced gear steps, the ADVENT X cassette allows riders to shift less often to find the right gear, while still having enough range to ride what they want. Fewer cogs also means less weight and a wider chain for better mud shedding. It even fits on standard 10-speed freehub bodies so you don't need to buy new wheels for no reason. In short, it's everything you want in a high-end drivetrain. - Two alloy large cogs and a full alloy spider eliminate unwanted weight - Ramped cogs aid in shifting under load - Continuously molded construction maintains straightness and durability - Compatible with standard HG freehub bodies and 10-speed chains - Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed - Cassette Cogs: 11-13-15-18-21-24-28-34-40-48

The pinnacle of cross-country cycling performance can be found in the SRAM XX SL T-Type Eagle AXS™ Transmission Power Meter Groupset. Built to serve the most demanding rider’s needs in the lightest weight configuration, XX SL Transmission is the evolution of SRAM's World Champion, World Cup winning XX Eagle AXS™. - AXS™ Pod ULT features a “click and fire” two-button design that transforms the crucial act of rider inputs into a vastly more personal experience for all your AXS™ controls - Engineered as integrated, interdependent transmission components, the XX SL Eagle T-Type rear derailleur mounts around the wheel axle itself, contacting the cassette directly with a first-of-its-kind Hangerless Interface - XX SL T-Type derailleur offers the same intuitive pairing and set-up procedure as SRAM's Eagle AXS™ derailleur - To further its performance, the lower pulley called, "Magic Wheel", keeps spinning if an object becomes lodged - Derailleur features an overload clutch that accommodates common maintenance - Ultra-lightweight XX SL T-Type 10-52t cassette offers game-changing inboard and outboard shifting performance under load - XX SL Eagle AXS™ T-Type Power Meter crankset boasts SRAMs XX SL carbon crankarm with an integrated power meter to record and deliver live, accurate power readings to your head unit - Power Meter spider-based design is highly accurate, high performing and boasts a long battery life

Odyssey JC/PC Pedals are designed with replaceable pedal bodies, pins, and nuts. - No bearings, adjustable bushing tension - Two-piece plastic bodies with replaceable metal pins and CroMoly spindles

- Allows quick chain removal without tools - MissingLink 410HD|~|1sp|~|BMX Heavy Duty chain|~|9.4mm|~|each|~| - MissingLink 410|~|1sp|~|BMX|~|8.6mm|~|each|~| - MissingLink II|~|8sp|~|all|~|7.1mm|~|6/card|~| - MissingLink-9|~|9sp|~|all|~|6.6mm|~|6/card|~| - MissingLink-10R|~|10sp|~|KMC, Shimano, SRAM|~|5.9mm|~|6/card|~| - MissingLink-10CR|~|10sp|~|Campagnolo only|~|5.9mm|~|6/card|~| - MissingLink-11|~|11sp|~|Campy, KMC, Shimano|~|5.5mm|~|6/card|~|

The STYLO 6K DUB crankset delivers consistent performance every time out. Featuring SRAM’s DUB technology, this design simplifies the relationship of the spindle to the bottom bracket. 6000-series forged aluminum arms support the X-SYNC 2 chainring to provide complete chain control. Now everyone can benefit from a new measure of durability. - SRAM DUB technology creates a lighter, stiffer and stronger crankset - 6003 series forged aluminum arms - Included direct mount X-SYNC 2 chainring provides significantly quieter performance, with better mud clearing and durability - Chainring is designed specifically for Eagle chains and drivetrains - DUB compatible bottom bracket sold separately - Boost Compatible - BB Included: No - Chainring BCD: SRAM Direct Mount - Crank Intended Use: Mountain - Number of Chainrings: Single - Drivetrain Speeds: 12, 11, 10 - Spindle Interface Type: SRAM DUB - Chainline/Hub Compatibility: 141/148 Boost Hubs

- Engineering-grade thermoplastic construction - SPD-SL compatible interface - Cleat Type: SPD-SL

Surly wants you to be able to set up you ride just the way you want it. This pair of adapter washers make it so you can throw your favorite 135, 170, or 190mm O.L.D. 10mm solid axle hub into the rear end of a 142, 177, or 197mm spaced thru-axle frame. Add the adapters, add the wheel, install and tighten the nuts and, bam, you're ready to rip. Make sure the solid axle on your wheel is the right length for the frame spacing. For instance: 190mm OLD QR goes with 197mm thru-axle spacing.

The Dagga is our brand new DH pedal. It was designed in collaboration with Chris Kovarik – one of the forefathers of downhill and flat pedal riding. Kovarik's unique and high-impact riding style inspired the Dagga's key features – our largest platform and widest stance ever. - Meant to be ridden with thick-soled shoes, the Dagga offers improved stability, power and articulation of the bike. - The Dagga features the same high strength chromoly axle system as other models with a double seal, inner bushing and outer cartridge bearing. - Largest Q-Factor, largest body, longest and largest amount of pins!

SRAM’s premier 10-speed chain features hollow pins and cut-out outer plates for accurate shifting in all conditions, light weight, strength and smoothness. Plus, it's compatible with all industry-standard 10-speed systems. And, with its great PowerLock connecting link, installation and removal is a snap.

- High Performance Brake Pads - Disc Pad Material: Organic

ENVE's Road Fork is the fork by which all others are judged, built for road cyclists looking for the optimal balance of weight, strength, and stiffness. When everyone was turning away from the fork aftermarket, we focused our efforts on creating the best aftermarket fork we could. By following our mantra of functional simplicity, we developed a manufacturing process that allows the fibers in an ENVE fork to run continuously from the top of the steerer to the bottom of the drop-outs. The ENVE forks feature a hollow one-piece design free of bonding or drilling, and the brake bolt hole is molded into the crown, allowing for additional weight savings and strength. You can literally put an ENVE fork on a bike within minutes of it leaving the mold. While this manner of construction is novel, the real win is that the majority of artisan frame builders and customers choose ENVE as their fork of choice due to its confident on-road performance and handling characteristics.

Liv's Contact Comfort+ Saddle is the perfect addition to your hybrid or commuter bike. It features a pressure-relieving base and center zone cut so you'll be comfortable while riding. And, with its lightweight, water-resistant synthetic cover and tough chromoly rails, this saddle is bound to last.

- Timeless, classically styled back swept touring bar - Bar end shifter and brake lever compatible - Outward grip angles for proper ergonomics - Material: Steel

Shimano's 105 10-Speed Cassette delivers excellent shifting and durability. The cogs are made of long-lasing, smooth-running steel. They have Shimano's engineered tooth shapes for precision shifting. And for lightness, the cassette has an aluminum carrier for the top cogs and nylon spacers.

Enjoy the ultimate advantage of freedom and adventure that Eagle provides combined with the Quarq power meter platform that delivers on accuracy and reliability. The SRAM Eagle XX1 power meter is built to pair with the SRAM Eagle drivetrains, providing a significantly quieter performance and extraordinary durability. Take it on the dirtiest, gnarliest trails while maintaining confidence in your cycling components. You came to perform; the Eagle XX1 power meter will perform with you. You are working hard, pushing yourself to new heights in some of the toughest conditions. Ride with confidence knowing that your power meter will not quit when you need it the most. Enjoy up to 200 hours of ride time in any weather or trail condition with its IPX7 waterproof rating and 10k temperature compensation; if harsh environments do not hold you back, then you need a product capable of rising to the occasion. The Eagle XX1 power meter is designed to be rough-and-tumble tough. Train harder, ride faster and unlock your ultimate potential. The Eagle XX1 power meter brings simplicity and ease-of-use to your training. With MagicZero automatic calibration, there is no need to worry about calibrating before you ride; just jump on your bike and go. The Eagle XX1 also features Bluetooth low energy and ANT+ wireless data transfer, delivering power output information directly to your cycling computer. - Speeds: 11/12 - BB Compatibility: DUB:BSA73, PF89.5, PF92, PF30 MTB73, BB30 MTB73, BSA MTB68SP - Bolt Circle Diameter (BCD): 104 BCD - Chainline: 52.0mm - BB Spindle Interface: DUB - Power Meter Type: ANT+ and BLE - Crank Arms/Chainrings not included

The Problem Solvers Locking Headset Spacer is handy during headset servicing for keeping the fork in place when the top cap and stem are removed. It's also great for keeping the fork in the frame when you're shipping your bike in a box, which usually requires removing the stem and bars. This quality piece is for 1 1/8-inch forks and is CNC machined of light, durable 6061 aluminum and has a stainless-steel bolt.

- AL6061-T6 crank with steel chainrings - 7/8sp compatible - 177mm Q-factor - 48.5mm chainline - Spindle Type: 120 SQR JIS

Ride comfortably on even hot days with Selle Royal's Respiro Moderate Women saddle. It boasts a Cool Cover that keeps the saddle up to 25 degrees cooler, and an innovative ventilation channel to keep the air flowing. Complementing these extraordinary features is Selle Royal's Royalgel that eliminates pressure points for awesome plushness. If you want the ultimate in breezy comfort, this is it!

- Reversible 6061 aluminum arms for left or right cable routing - Quick-release noodle is lined with Teflon for smooth action - High tension square wire springs - Thinline threaded pads with easy-to-adjust arm hardware - Made in USA

Crank Brothers' Eggbeaters are 4-sided, which makes them super easy to enter and exit. Their open design makes them shed mud and debris quickly, and these pedals feature 6-degrees of knee-friendly float. The Eggbeater 1s feature chromoly axles, stainless-steel springs, and steel bodies.

Shimano's Deore XT Rear Derailleur uses cold-forged construction and cutting edge technology to deliver crisp shifting, real-world reliability, and trademark precision. Plus-type derailleurs use a lever-actuated clutch spring to prevent chain slap, reduce noise while on the trail, and improve chain engagement when riding over rough terrain. Sealed pulley bearings keep things spinning smoothly, and wide plate construction prevents the derailleur from getting clogged with mud and debris.