Accessories

- Shatter-Proof aluminized glass mirror, Resists discoloration - Mounts on either side of helmet offering a wide range of adjustment - Mirror and/Or arm can be detached from helmet mount - Adhesive backed plastic fan-Plate fits most helmets

Topeak's DeFender RX rear fender offers durable rain and mud protection on wet and sloppy rides. It's incredibly light and easy-to-use, too. The quick-release seatpost attachment allows the DeFender to be installed and removed in seconds.

The Mirrycle Road Mirror was developed exclusively to fit Shimano STI shifter/brake levers without interfering in any way. The Road Mirror fits almost all the different shift/brake combos. It goes on quickly and easily with the included tools. Just a flick of your eyes allows for a quick view behind. And, it can be attached to either the left or right side lever. Let's be careful out there.

Need more carrying capacity for running errands? Then check out Topeak's Front Basket. It easily attaches to you bike's handlebars and holds all your groceries or whatever else you pick up. And, the handle makes this basket extremely portable.

Kryptonite's Keeper 785 Integrated Chain features a 7mm-thick, four-sided link chain perfect for use in low- to moderate-risk locations. The triple heat-treated manganese steel chain has a durable nylon cover to protect your bike from scratches. Plus, it uses an integrated hardened deadbolt that is pick and drill resistant, and it thwarts most leverage attacks as well.

The KryptoLok Combo U-lock is like a tough nut: you just can't crack it. Thanks to the 13mm hardened Performance steel shackle that resists cutting and leverage attacks, you get peace of mind while you run into the grocery store or lock up outside the coffee shop. A built-in four-digit resettable combination gives you easy unlocking and locking capabilities--no keys necessary! You can also take advantage of the Transit Flex Frame bracket for plenty of convenient mounting options. The KryptoLok Combo is 4 x 8-inches and has an anti-theft protection offer.

The Wald 582 sets the standard for ingenuity when it comes to rear baskets. Mounting to the side of many rear racks, this nimble basket is the perfect size for packing 1-2 bags of groceries while balancing your load. When not in use, the base of the basket pivots up allowing the side walls to collapse. A simple clamp at the top keeps the basket out of your way when not in use. - Made in U.S.A. (Maysville, KY) - Baskets clamp to most rear racks up to 1/2" diameter - When not in use the base of the basket pivots up allowing the side walls to collapse making the collapsed basket 1" thick - A simple clamp at the top keeps the basket out of your way when collapsed - Extended basket is 12 3/4" front to back x 7 1/4" side to side x 8 1/2" deep - 582 Baskets have a Zinc Plated Finish; 582BL and 582WH Baskets have a Powder Coat Finish - Complete basket weighs 2.8 lbs.

- Easy-Click Locking - Ergonomic dials for ease of use - New easy to use reset design - Included bracket to easily carry on a bike (-03, -06)

Giant's Gateway Bottle Cages use 5mm-thick tubular aluminum for a safe, secure, and rattle-free hold on your bottles.

Topeak's Handlebar DryBag withstands the toughest commutes and longest tours. Fully seam-sealed 420/840-denier polyester, plus a weatherproof zipper ensure your stuff stays clean and dry. The EVA-foam, divided main compartment protects your gear from road vibration and the padded shoulder strap provides convenience. Plus, the Handlebar DryBag comes equipped with a quick-release mounting bracket and reflective accents for visibility.

This is the rebirth of Blackburn's successful Camber Cage. Built tough to withstand MTB abuse, yet elegant enough to pop on your road bike, the Camber Cage pulls double duty, and looks good doing it. - Different color and finish options lets you pick a cage to match your bike - UD Carbon layup provides a smooth finish that reflects current carbon frame designs - "Rib cage" retention design hugs your bottles securely - Flared top opening assists with aligning your bottle to the cage while on the fly - 30 grams

Tri-Flow Superior Lubricant is a light viscosity lube that allows for deep penetration into hard to reach moving parts. - Ideal for all conditions - wet, dry, road and trail - High grade petroleum oils provide optimum lubrication under extreme temperatures (-60 to 475F) and humidity

• Chrome plated tools • Includes key holder • 2/2.5/3/4/5/6/8/10mm

Buzzy's Slick Honey has a superior ability to reduce sliding friction, making it ideal for lubricating o-rings, seals, bushings, and any other sliding or pivoting parts. Try it on your bike and you'll see why major suspension fork manufacturers like Rock Shox, Fox Racing and White Brothers use Slick Honey in their service departments.

Jagwire's Pro Internal Routing Tool simplifies routing through a frame, using powerful magnets to safely and easily guide cables, housing, and e-shift wires. - A retractable, flexible magnet can be inserted into the receiving end of an internal cable run to find the magnetic adapter and easily pull it through - Adapters for inner cables, hydraulic hose, and Di2 e-Tube wires are included - The adapters nest neatly inside tool body when not in use

Park's Crank Puller is for removing crankarms on Shimano's splined, oversize, pipe-billet bottom brackets. It employs a long handle and a fine thread for the leverage and torque needed to remove tight arms. Park's unique rotating tip ensures smooth operation and long life. (The CCP-44 does not fit standard square or tapered bottom brackets.)

- Integrated top plate for quick-mount MTX 1.0, 2.0, and RX trunk bags - Integrated fender top - 6061-T6 alloy construction - Spring clip for additional cargo security - Designed for compatibility with disc brakes - 800g - 55lb weight capacity

Rain, sleet, hail, snow, no matter what form it comes in, water can reek havoc on your drivetrain. Fortunately, White Lightning's Wet Ride is designed to meet the demands of riders who traverse soggy terrain and ultra-long distances. This heavy bodied lube is made of premium synthetic oils and water-repelling polymers so it's 100% waterproof and unwaveringly durable. Dirt loving riders will appreciate how well it counteracts the effects of mud and every cyclist will appreciate the anti-corrosion additives that even protect during wet, winter commuting.

• Updated to fit better in the hand with a more rounded, smoother shape • The precision sized SW-7.2 fits the three most popular spoke nipple sizes on the market • Nickel plated for years of service • Designed for the home mechanic. FIts the following size spoke nipples: • .127" (3.23mm) • .130" (3.30mm) • .136" (3.45mm)

Made from high precision, hardened Cro-Moly steel, Park's Bottom Bracket Tool (External Bearing) can be turned with a 3/8" drive wrench, 1" wrench, or Park Tool FRW-1 Freewheel Remover Wrench (each sold separately).

- Innovative chain retention hook locks tool onto cassette, ensuring full chain wrap and eliminating slippage. - Tool geometry offers maximum effective leverage and compact 270mm length. - Compatible with all multi-gear cassettes including 12-Speed. Chain retention hook fits cogs up to 18 teeth. - Integrated fixed gear lockring wrench optimized for 41-42mm OD lockrings. Pedro's new Pro Chain Whip takes inspiration from our beloved Vise Whip, applying many of the same functional principles to a more traditional chain whip design. The Pro Chain Whip design focuses on functionality, practicality, and safety. The innovative chain retention hook offers multiple benefits. First it keeps the chain secured to the tool during storage. Secondly, it improves user safety by locking the tool onto the cassette, ensuring full chain wrap and eliminating slippage. An added bonus of this feature is that the tool stays in place on its own. No more fumbling with your cassette lockring tool with one hand while trying to keep your chain whip in place. Being attached to the cassette, the Pro Chain Whip can also be used to slide the cassette off the hub. A nice option when dealing with grimy gears. Keeping traveling mechanics and portability in mind, the Pro Chain Whip geometry maximizes effective leverage while keeping the tool length to a compact 270mm and 225g weight. The integrated fixed gear lockring wrench, optimized for 41-42mm OD lockrings, adds versatility and is one less tool to carry. The Pro Chain Whip is compatible with all multi-gear cassettes including 12-speed, and the chain retention hook fits cogs up to 18 teeth.

Air Force Tier Three floor pump - Premium Rubber Overmolded Ergonomic Handle - Top Mounted 2.5" Analog Pressure Gauge (PSI/BAR) - Larger More Stable Pump Base - Simple Valve Head (Presta/Schrader) - Integrated Hose Keeper - All Metal Barrel and Pump Base - 28 1/2" Pump Height

- Includes everything for a quick fix while on or off-road - Giant seat bag - 12 glueless patches - 2 tire levers - Mini pump - 9 function multi-tool

Stan's Dual Action Repair for Tubeless (DART) fixes damaged tires faster, easier, and better than existing plug tools. While traditional tire plugs try to wedge rubber strips into a puncture, the DART creates a chemical reaction with your Stan's sealant to quickly form a permanent airtight bond. The DART's plastic tip is barbed to anchor firmly in place and stay put during even the most aggressive riding while being safer for rims, rim tape, and your hands. The material of the DART is also more flexible, and its laser-cut shape is optimized to contour to the shape of different punctures, maximizing surface area to increase the sealing reaction. Because the DART anchors to your tire and creates an instant bond with your sealant, it also won't pull out while riding the way a conventional plug can. One of the best features of the DART's design is that it doesn't require trimming once inserted, and excess material won't get in the way of your ride. DARTs can't be felt while riding, even on road tires, and they wear smooth naturally. - Repairs large punctures and slices - Reacts with Stan's sealant to form an instant, airtight seal - Barbed plastic tip anchors into tire and will not pull out when riding - Flexible material and laser-cut shape conforms to puncture and bonds with sealant - Wears off clean, no trimming needed, and can not be felt while riding, even on road tires - Lightweight, compact tool fits the shape of your hand for more precise use and includes built-in valve core remover - Includes two pre-loaded DARTs for sealing multiple and larger punctures - Clear caps keep DARTs clean and unthread quickly for fast deployment - Simple and easy to refill

- Constructed using a 6mm aluminum rod - Embossed MSW logo

They always say, the right tool for the right job. Park's P-handled Torx Wrenches are available in T6, T8, T10, T15, T20, T25, T30 and T40 sizes. They feature offset handles made from durable nylon with a comfortable, ergonomic design. The wrenches are made of high-torque industrial steel for excellent durability.

Park Cone Wrenches are made of durable tool steel to fit the low-clearance adjusting nuts and cone flats on hubs and other bearing assemblies. Park's special Y-heads put more material where it's needed for excellent durability and strength. The 28mm size fits newer Shimano 20mm through-axles, as found on XT, XTR and Saint hubs. Most applications require at least 2 cone wrenches. Call or stop by. We can recommend the correct sizes for your needs.

The Serfas E-Lume Series light line was developed to be the best on the market at the very best value. These headlights will meet and exceed their expected lumen output while offering you all the features you've come to enjoy from Serfas lighting. - Compact Lightweight Aluminum Design - Super Bright (900 Lumens) Output - Water Resistant Rating: IPX6 - 3 Level Battery Life Indicator - Last Mode Memory - Max Charges Rate of 1.5A - Charges from Dead to Fully Charge in 2 hours (Using 1.5A Rated Charger) - Solid Modes: Overdrive (900 Lumens): 1.5 hrs, High (450 Lumens): 3 hrs, Medium (300 Lumens): 3.5 hrs, Low (150 Lumens): 9 hrs - Flash Modes: Daytime Flash (900 Lumens): 50 hrs, Low Flash (200 Lumens): 30 hrs - Weight: 162 Grams with Bracket - Battery: LG 1-Cell Li-Ion, 2600mAh Includes: - Micro USB Cord - Handlebar Mount

Topeak's MondoPack features a unique, positive locking mount that makes attaching and removing the pack a snap. Its streamlined design prevents thigh rub, even when fully loaded and the large main compartment offers plenty of room for carrying tubes, a C02 pump, wallet, keys and whatever else you need. For low-light conditions, 3M reflective strips on three sides add safety and its 1200-denier construction makes the MondoPack durable and tough.

Jandd Bicycle Mounted Rack Clamps are for mounting racks with no braze-on points. - Stainless Steel Coated Clamp - Sold as a Pair

- Precision laser-cut tool steel. - Features 7mm & 8mm flare wrenches plus rotor truing slot. Driven by a request from mechanics in the pits every day, and sure to become a favorite, the Disc Wrench features 7mm and 8mm flare style box wrenches needed for the delicate hose fittings found on hydraulic disc brakes. The compact wrench also features a disc rotor truing slot and is made from precision laser cut tool steel.

Mounts on handlebars higher than standard bells. Sits close to your fingers and doesn't interfere with other handlebar-mounted devices. - Dome Diameter: 40mm (1.57") - Fits handlebars with 22.2mm (.87-inch) outside diameters

- Mini torque wrench preset to 5 newton meters - Includes 3, 4, 5, and 6mm hex bits, T20 and T25 torx bits

Our Trainer Axle is designed to adapt your thru-axle equipped bike to on-wheel trainers, such as a 1up, Blackburn, Cyclops, Kinetic, Tacx, Wahoo, and many others. Our goal is to fit the thru-axle to your bike perfectly to minimize spacers and extra parts, providing a clean, high-performance axle for your bike. Train, warm up, and be race ready and fit for the season. - When it’s time for your race or time to head outside, simply remove your bike from the trainer, remove the drive side axle end and go. Our axle is suitable for use on or off the trainer, indoors or out. - The axle shaft and axle ends are precision CNC-machined from 7075 aluminum and hard-anodized for rugged durability. - No special tools required. Design allows for installation or wheel removal using your standard 5mm hex wrench. - Designed, built, and quality tested in the USA. Proven around the world. Important: Before you order, make sure your specific trainer will accommodate the width of your modern thru-axle-equipped bike. Measure your trainer at the widest setting and measure the outside width of your bike frame. Our the trainer axle ends will extend past your frame on each side.

This handy shop aid is ideal for sizing spokes, ball bearings, and crank cotters. To use, just hang the head of the spoke in the oblong hole and read its length on the scale. For crank cotters and ball bearings it works just like a gauge for drill bits. • Has both metric and fractional spoke length markings • Anodized aluminum with embossed markings to allow easy reading and long life

Park's Cone Wrenches are made of durable tool steel and are nice and thin to fit on the small-clearance cones found on hubs and other bearing assemblies. Plus, they work as regular wrenches, too. They feature Park's special Y heads that put more material where it's needed for excellent durability and strength. This 23mm size fits Shimano 15mm through-axle hubs. Some applications require at least 2 cone wrenches. If you have questions please contact us and we can recommend the correct sizes for your needs.

Service kits include dust seals, foam rings, oil seals, air and damper o-rings needed for basic service.

Whether you're fine-tuning your new full-suspension rig or tuning a fork you've ridden for years, Finish Line's Max Suspension Spray is a pro-grade stiction-fighting stanchion lubricant that maximizes the performance of your suspension. It smooths suspensions that have become dry or dirty and restores full travel and eliminates noise, too. Use Max before rides to ensure maximum responsiveness over the smallest of bumps, and the longest possible travel over extreme terrain. And, use Max to break in new forks or bring old ones back to life. It also conditions and protects rubber seals and O-rings and improves the surface slip of coated stanchions. - Helps suspension forks run more smoothly and quietly - Made with polysiloxane and advanced fluoropolymers

Take the guesswork out of installing cables, wires and housing inside the frame. The IR-1.2 speeds the internal frame routing of electric wires, shift cable/housing, brake cable/housing and hydraulic tubing on carbon fiber, titanium, and aluminum frames. Kit includes four plastic-coated 250cm cables with attached magnets and unique fittings plus an external guide magnet to speed operation. Newly updated to include a dedicated E-tube Di2 cable connector that easily pulls through a 6mm frame hole. Opposite polarity magnets on cables seek and attach inside frame tubes, making it easy to route through frame entrances and exits. Works with any size frame including tandems. A true time and frustration saver!

- Includes basket holder - Carrying handle for off bike use - Polyester powder coating - 11.75" x 8" x 9"

Y-Style Hex Wrench - Perfect for common hex hardware found on modern bicycles and components. - New improved ergonomic Y-style handle design. - Features refined body shape, quick-spin bit sleeves, longer bits, and bit-size indication. - Designed to stand up to the harsh conditions of professional use. - Pedro's popular Y-Wrenches feature heat-treated tool steel construction and durable plastic body designed to stand up to the harsh conditions of professional use. - The new improved ergonomic design features a refined body shape for improved fit and comfort, new quick-spin bit sleeves for speed and versatility, and bit-size indication for quick tool identification. - Backed by Pedro's lifetime warranty.

The Folder Compact offers all of the safety and durability of the Folder One in a slightly smaller package. The patented easy-store folding frame fits into your trunk for easy transport and accommodates kids with up to 2" shorter inseams than the Folder One. Like all Trail-A-Bikes, the Compact is backed by a lifetime warranty so your family can ride with confidence. - Steel frame, designed for children aged 3-5 - Shorter reach and cranks, smaller chainring, and narrow handlebar - Simple single-speed is easy to pedal and ride - Patented, folding frame for easy storage and transport - Compatible with most 26" and 700c lead bicycles - Low center of gravity offers increased stability to parents and children - Best-in-class steel hitch + 4 adapters will fit almost any seatpost - Full chainguard and bashguard for enhanced durability - Includes safety flag for maximum visibility on the road

• L-shaped hex set with holder • Rounded head on one end • 2,2.5, 3-6mm Hex keys with 8mm hex adapter

Upgrades any pump to a SmartHead pump head. Includes hardware, 40-inch hose, and SmartHead pump head.

The All New 2021 Serfas® E-Lume Series Headlight New for 2021 our E-Lume Series Headlights feature a redesigned extruded aluminum housing, new optical lens with excellent side visibility, and improved battery capacity and LED performance. We made not only increased performance a priority but also improved rider visibility, so we designed an all new optical lens and housing with front corner cutouts to allow drastically more light be visible when viewed from either side – and this all without any reduction in quality of forward illumination or beam pattern. Constructed of aluminum the E-Lume housing is strong and lightweight as well as an efficient thermal conductor which effectively reduces heat buildup thus helping maintain cooler temperatures for optimal battery performance and consistent light output. Light output of the E-Lume 1750 is sent through dual optical lenses creating a broad powerful beam with strong front illumination and excellent side visibility. Limited Lifetime Warranty Serfas® warrants to the original purchaser that the product is free of defects in material, construction, and/or workmanship for the lifetime of the product. Battery Warranty – One Year Coverage Serfas® batteries are covered by a 1 year warranty from the original date of purchase. Features: - All-In-One Design - High Output Dual LEDs - Extruded Aluminum Body - Press and Hold Button Lock - Daytime Flash Mode - Up To 50 Hrs Runtime - Integrated USB Rechargeable Li-Ion Battery - Backlit Button Indicates Charge Status and Low Battery - Handlebar Bracket - USB Charging Cable Specs: Solid Mode: - Overdrive 1750 Lumens – 2 hrs - High 1000 Lumens – 3.5 hrs - Medium 700 Lumens – 6.5 hrs - Low 400 Lumens – 9 hrs Flash Mode: - Daytime Flash 1750 Lumens – 50 hrs - Low Flash 200 Lumens – 35 hrs Weight : 265g w/ Bracket Battery: 2-Cell Li-Ion 5200 mah Charge Time: 3.5 hrs To Full At 2A Using USB Wall Charger Color: Black

Boost the carrying capacity of your Topeak MTX BeamRack (sold separately) with their Dual-Side Frame. It enables you to attach panniers and other Topeak MTX bags to your BeamRack.

Heat treated alloy tool steel, one inch base fits wrench or bench vise. Thin wall construction allows use without removal of cones and locknuts. The FR-5.2G has 12 splines that are approximately 23.4mm across. - Fits Shimano, SRAM, SunRace, SunTour, Chris King and other cassette lockrings - Fits the SRAM XX1 11-speed cassettes - Also Fits Shimano disc brake lockrings - Guide pin stabilizes tool

Park Tool introduced the bicycle world to the 3-way hex wrench set over 30 years ago. Our 3-way wrenches fit perfectly in the palm of the hand and provide excellent leverage, making them a favorite of countless shop mechanics worldwide. AWS-3 FEATURES - 2mm, 2.5mm, and 3mm hex set - Wrenches made from industrial tool steel, through hardened and tempered for long life - Chamfered tips for a perfect fit

The ultimate clip-on mudguard set for road and cyclocross bikes for tire widths between 25 and 32mm. Its smart, double-hinged quick release fitting system also fits aero forks and is also compatible with disc brakes, direct mount brakes, and thru axles. Mudguards can be perfectly adapted to the radius of the wheel by adjusting the length of the stays. Its superlight extra long mud flaps give additional spray protection. In addition to using the quick release rubber straps it can also be fixed in place with zip ties. Includes adhesive protection kit to avoid damaging the paintwork. Disc brake compatible: Please be mindful of the brake wire.

Replacement Part – Headlight Bracket - Fits all Serfas headlights - Long silicone strap allows endless mounting options - No tools needed - Cannot be used with: TST-70, TST-100, TST-150 & TBT-50R

• Fits 8-11 speed chains • One piece die-casting • Double-sided replaceable pins • Integrated bottle cap opener • Chain clip

Topeak's DeFender FX front fender offers durable rain and mud protection on wet and sloppy rides. It's incredibly light and easy-to-use, too. The FX installs easily to your fork and features quick-release attachments that allow it to be installed and removed in seconds.

The KryptoFlex 1030 Looped Cable is a 10mm braided steel cable providing increased cut resistance. The double loops are for use with U-locks, disc locks and padlocks (sold separately). The vinyl coating protects bikes and equipment from scratches and it includes a Hook-n-Loop strap for easy carrying. The KryptoFlex 1030 Looped Cable is 0.4-inch x 30-feet.

Park's Torx Wrench Set is just what you need to make repairs on many of your bike parts that use Torx (star-shaped) fittings, such as disc brakes, pedals, chainring bolts, and others. It offers the common bicycle wrench sizes (T7, T9, T10, T15, T20, T25, T27, T30 and T40) in a convenient fold-up set. Its composite handle is super strong, comfortable to use and slip resistant.

Quick Overview - 270 Degree High Visibility Design - Highly Adjustable Mounting System - 30 Lumens - Daytime Flash Mode - 5 Modes: 2 Solid / 3 Flash - Micro USB Rechargeable Limited Lifetime Warranty Serfas® warrants to the original purchaser that the product is free of defects in material, construction, and/or workmanship for the lifetime of the product. Battery Warranty – One Year Coverage Serfas® batteries are covered by a 1 year warranty from the original date of purchase. Features: - 30 Lumen Max Output - 4 LED Chip - Finned Lens Design Provides 270 Degree Visibility - Blue LED Charge Indicator - Daytime Flash Mode - Up To 34 Hours Runtime - Micro USB Rechargeable Specs: Solid Modes: - High – 15 Lumens / 2 hrs - Low – 6 Lumens / 6 hrs Flash Modes: - Daytime Flash – 30 Lumens / 34 hrs - High Flash – 15 Lumens / 19 hrs - Low Flash – 6 Lumens / 34 hrs - Weight: 26 Grams w/ Bracket Size: - Overall Height – 56.3mm (2.22?) - Main Cylindrical Body Width – 21.7mm (0.86?) - Widest Fin Width – 32.3mm (1.27?) - Charge Time: 2 hrs Using 500mA USB Wall Charger Product Package Contents: - (1) UTM-30 Cosmo 30 Lumen Tail Light - (1) Micro USB Charging Cable - (3 Sizes) Rubber Mounting Inserts - (3 Sizes) Rubber O-Ring Mounting Straps *Please note, flickering or pulsating observed in video is due to, “strobe effect,” a video capture phenomenon and is not representative of what is seen by the naked eye (steady shining light)*

The Torx-style fastener is becoming the new standard for modern bicycles and components. Pedro's led the way offering the first Y-style Torx wrench to meet the demand. Recently named VeloNews Editor's Pick for Best 3-Way Wrench, Pedro's popular Y-Wrenches feature heat-treated tool steel construction and a durable plastic body designed to stand up to the harsh conditions of professional use. The new, improved ergonomic design features a refined body shape for improved fit and comfort, new quick-spin bit sleeves for speed and versatility, and bit-size indication for quick tool identification. Includes T10,T25, and T30 sizes, perfect for the most common Torx hardware sizes found on modern bicycles and components. - New improved ergonomic y-style handle design - Features refined body shape, quick-spin bit sleeves, longer bits, and bit-size indication - Designed to stand up to the harsh conditions of professional use - Backed by Pedro's lifetime warranty.

The Park FR-2 Freewheel Remover fits SunTour two-notch freewheels. It's built thin so that removing axle parts is unnecessary. And, it's constructed of durable heat-treated steel. (Not recommended for use with SunTour 4- and 6-notch freewheels.)

This item contains 10 replacement plugs for the Blackburn Plugger Tubeless tool (sold separately), a one-shot tire plugging system for tubeless tires. It deploys in seconds to give a permanent fix for your flat.

The Saris Leveling Block keeps your bike level with your trainer. - Adds stability to your training ride. - For use with any rear wheel-mounted trainer. - Raises front bicycle tire 1.1 inches (2.8 cm) off the ground

The CC-4 is a drop-in style gauge that measures bicycle chain wear. The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of knowing when chain replacement is necessary. A worn chain will cause poor shifting as well as accelerate drivetrain wear. The tool works on any 5 to 12-speed derailleur chain (including SRAM AXS) and is designed to accurately indicate when a chain reaches .5% and .75% wear, the points at which most chain manufacturers suggest replacement.