The Problem Solvers Cassette Spacers are made of light and durable anodized aluminum and come in different thicknesses for correctly spacing various brand and model cassette cogs. Measure and match your spacers to choose the right width.

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.

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.

All Wheels Manufacturing replacement derailleur hangers are produced in their Colorado shop to exacting tolerances. - CNC machined 6061 aluminum - Black anodized finish - Includes (2) M3x10 Socket Head Cap Screws

This kit contains all the parts needed for scheduled maintenance and/or rebuild of B1 Stealth Reverb Seatposts. - Includes Blue 1-Piece U-Cup Seal Internal Floating Piston (IFP) - Rebuilds IFP, Poppet, Seal Head, Dust Seal, Piston, Brass Keys, and Bushing - Requires RockShox Specialty Tools to perform Service: Post Bleed Tool, Oil Height Tool, IFP Height Tool - B1 posts have a black return speed adjuster on the remote and "ROCKSHOX" laser-etched logos on stanchion by the saddle cradle

Problem Solvers' Braze-on Light mount threads into your fork or fender eyelets, allowing you to mount lights or accessories. It's lower position is great for getting your light closer to the ground for better visibility.

- Non-reusable joining pins for Gusset Chains

Saddle rail clamp outer-pieces to adapt Ritchey WCS Carbon 1-bolt posts to various saddle rail dimensions. - 8x8.5mm or 7x9.6mm available

The Problem Solvers Steerer Tube Shims are for installing 1-1/8-inch diameter threadless stems on 1-inch diameter threadless forks. The shim is made of light, durable anodized aluminum and is chamfered on the ends for easy stem installation.

If you're suffering from a slipping seatpost, Surly has the remedy. The Constrictor Seatpost Clamp grabs your post tight and hangs on for dear life. It's machined from anodized aluminum billet, uses an 8mm bolt for ultimate strength, and can accommodate a rear cantilever brake hanger.

Pair this kit with a cassette cog of your choosing (sold separately) and discover the joy and simplicity of a singlespeed without the cost of a new wheel. The Singlespeed Spacer Kit includes a variety of high quality aluminum spacers so you can dial your chainline and a stainless steel lockring to tighten everything down right.

Turn your geared bike into a singlespeed machine with Surly's Singleator. The Singleator mounts to your derailleur hanger and provides a smooth, quiet and adjustable means of tensioning the excess chain slack on any bike. It's made from strong forged steel and features a triple-sealed spring, large-cog capacity, chain guides, fully-adjustable chain line, floating pulley, and a stainless-steel pivot bushing. And, it works with both BMX and standard chains.

The 12mm slotted MDS dropout is the newest chip for Surly's MDS equipped trail frames. You like chips, don't you? The 12mm slotted dropout chip uses a standard derailleur mount for maximum compatibility and is made of cast and machined 6061-T6 aluminum, with a fender eyelet. What's the coolest part about the 12mm slotted MDS chip, you ask? The fact that it also has the capability to run a 12 x 142mm thru-axle in a single speed configuration. This is good news because single speeds are good news. When you get an MDS equipped frame you're getting the option to set it up however you want. You can run a 142 x 12mm thru-axle rear end with a direct mount Shimano hanger, standard 135mm QR or The Mighty Singlespeed. The way this will work is that Surly complete bikes that feature the MDS will ship with whatever chip is compatible with derailleur spec. For instance, the complete Instigator 2.0 ships with the 142 x 12mm thru-axle Shimano chip. If you want to change it to a singlespeed later (and why wouldn't you?), all you have to do is get the SS chip. Frames will ship with all three MDS chips so pick your poison. The 142 x 12mm and 135mm QR chips are made of cast and machined 6061-T6 aluminum and The Mighty Singlespeed chip is 304 stainless steel, because the two words 'aluminum' and 'singlespeed' should never be too close to each other. Bad things can happen…. As you can see, the MDS gives you not just different build options, it lets you use a more varied selection of parts for your frame up builds. The MDS is featured on most of our trail bikes. That's right: Krampus Ops, Karate Monkey Ops, Instigator 2.0 and Ice Cream Truck frames all sport these puppies.

Whether for derailleur clamp clearance, tire clearance, or personal preference, sometimes it can be advantageous to run the wheel further back in the dropouts. Monkey Nuts install into Surly horizontal dropouts to make spacing the wheel back easy. There are 3 different sets depending on the type of dropout and axle configuration the dropout is intended for. Simply select the correct version of Monkey Nut, install it into the frame, and slam the wheel all the way forward. Bang, done.

Surly Mr. Whirly Crank Arm Fixing Bolts - For use with Surly Mr. Whirly cranks only

Surly Mr. Whirly Spindles. - 100% CroMoly steel - Proprietary dimensions and spline for use only with Surly Mr. Whirly cranks

Surly OD Cups - Compatible with 24mm spindles

Surly Surly Big Dummy Frame Protective Plug Insert. - Notice the tapered end of each plug, if the end of a tube is dented, tap the protective plug into the tube with a soft hammer to round the tube out - Designed to prevent damage to the front bridge tube while frame is being shipped - Doubles as a tool to help round out any damaged bridge tubes or upright tubes during use of the bike - The diameter of the plug is designed to round it out to the correct diameter so that it receives accessories properly

Single chainring drive train setups are all the rage these days. With the introduction of exceedingly wide range 10- and 11-speed cassettes, the need for two chainrings has become a thing of the past. But when you only have one chainring, the only thing standing between you and a long walk back to the trailhead is you making sure you don't destroy your one chainring. That's why Surly made a chainring guard to fit O.D. cranks. It is made of aluminum and will take the hit for your chainring. It comes in 5 bolt, 94mm BCD and was designed to protect 22t – 30t rings.

Like some of Surly's other chain tensioning devices, Snuggnut keeps your rear wheel from slipping forward in the dropout under the pedal load of your powerful gams. It's specifically designed for bikes that feature 12mm horizontal, vertical-slotted dropouts and is particularly suited for singlespeed application. Snuggnut is CNC-machined for durability and good looks, and shares many design features found on Tuggnut and Hurdy Gurdy. Note: The Snuggnut is compatible with horizontal thru-axle dropouts only. If using 10/12 Adapter Washers and QR wheels use a Tuggnut instead. Snuggnut is not for use with MDS Chips. Compatible models listed below: - Wednesday - ECR 29+ - ECR 27.5+ - Ogre - Krampus - Karate Monkey SS - Karate Monkey 27.5

Rear disc brake adaptor specifically designed ONLY for the Surly Troll, Ogre and ECR. - For use with 160mm rotor only - Brake caliper must be 74mm post mount compatible

Hurdy Gurdy is another nifty device that keeps a rear wheel from slipping forward in the dropout under pedal load. It's designed for the Cross-Check's semi-horizontal front-loading dropouts, and will also work on many other similar dropouts. Hurdy Gurdy is investment cast of stainless steel for durability and good looks, and shares many of Tuggnut's design features. Its two axle holes allow for a wide variety of fore/aft wheel positions, it will work with standard QRs, bolted axles, and nutted axles up to 10mm.

Rated fully KICKASS by a very authoritative entity who will remain unnamed, Surly's cast and polished stainless steel clamps won't rust or chip paint because they can't (even the black ones!). They're shiny! They look good! And most importantly, they deliver the clampability seatposts crave.

Replacement bolt for Surly Constrictor seatpost clamp. - Size: 8mm

Surly's low-profile, bolted Thru-Axles are specifically designed for use with Surly thru-axle compatible frames. Not sure which one fits your bike? Get in touch, and we'll ensure you're choosing the correct axle for your application.

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.

This low-profile bolted Thru-Axle is specifically designed for use with Surly thru-axle compatible frames. - Earlier, two-bolt design offers secure wheel fixing and either-side removal

This fine pair of Surly 10/12 Adapter Washers is designed to adapt any 135, 170, or 190mm O.L.D. QR axle hub with a 142, 177 or 197mm spaced thru-axle frame. Make sure the QR axle on your wheel is the right length for the frame spacing. For instance: 190mm OLD QR goes with 197mm thru-axle spacing.

All Wheels Manufacturing replacement derailleur hangers are produced in their Colorado shop to exacting tolerances. - CNC machined 6061 aluminum - Black anodized finish - (2) M4x10 Flat head screw included - For Di2 shifting systems

- Includes 61803 bearings and one grease syringe - Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings - These 61803 bearings are not interchangable with the 88/188 hub 61803 bearings