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Keep your seatpost right where you left it. Upgrade to a quick release seatpost clamp for easy seat height adjustments. - Follow laser-etched torque listing on collar

In the race against the clock, Bontrager's Race Lite Clip-On Aerobars S-Bend give you the advantage you need. Adjustable arm rests and extensions allow you to dial in your profile position so you can comfortably stay in a wind-slicing tuck. And the internal cable routing keeps everything out of the wind, nice and neat.

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.

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.

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.

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.

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.

- Clamps to a threadless steerer, offers up to 3-1/4" stem height increase - Forged 6061 aluminum - Threaded alloy top cap

Clean up your Bontrager Elite stem cockpit with Blendr Elite bases. Blendr works with this simple formula: Stem + Base + Mount. Add accessory. Key features: - Bases for use with Elite stem - Add any XXX accessory mount for an elegant integrated look

- Quiets chain slap and protects chainstays from nicks and scratches - Standard protector fits most chainstays - Universal kits come with circle protectors to eliminate frame damage due to cable rub

The SRL lever gives riders with 1x drivetrains the option to control their Command Post with lever option that mounts beneath the bar in place of a front shifter. - Command Post lever for the modern 1x drivetrain systems. - Adjustable lever position allows for the perfect set up. - Sealed cartridge bearing pivot for smooth action. - Ideal pull ratio for easy lever activation. - Requires additional mounting hardware (SRAM MatchMaker or equivalent is recommended).

The SRL LE lever gives riders with one-by drivetrains an affordable option to control their Command Post with a lightweight lever option that mounts beneath the bar in place of a front shifter. - Command Post lever for the modern one-by drivetrain systems. - Injection molded lever is light, durable, and features a textured design for added grip. - High quality bushing design provides smooth lever action. - Ideal pull ratio for easy lever activation. - Requires additional mounting hardware (SRAM MatchMaker or equivalent is recommended).

The Problem Solvers Cable Doublers are made of light, durable machined and anodized aluminum and they are Teflon coated for a super-smooth cable pull every time. They come in two models. The first allows you to control two brakes with one lever. The second allows you to control one brake with two levers. Why? Well, there are myriad applications: tandems, cyclocross bikes, fixies, tricycles, recumbents, cycles for those with special needs, bike polo bicycles, those 4-person bikes you see on beach boulevards, and so on. You could even link both models of Cable Doublers together for the ultimate in redundancy!

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.

Power Links provide tool free chain assembly. - 8-speed width: 7.1mm - 9-speed width: 6.8mm - Chain Compatibility: SRAM - Reusable: Yes

These are the correct connecting links for SRAM's 12-speed Eagle chains. They are great for installing new chains and fixing chains on the road and trail, too. They come in a four pack, for use with four chains.

Key features: - Blendr works with this simple formula: Stem + Base + Mount. Add accessory. - Bases for use with Bontrager Pro Blendr stem - Add any XXX accessory mount (sold seperately) for an elegant, integrated look

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.

The VukaClip is all about providing the ultimate in fit, security, and adjustability for you to be faster and more efficient in your triathlon or time-trial aero position at an affordable price. Redesigned to be easier to set up and adjust. The VukaClip is available with an above-bar or below-bar mounting system for achieving an optimized aero position. The VukaClip also has a large, redesigned armrest to reduce pressure points and increase comfort. The VukaClip is made with the industry-standard 22.2mm clamp diameter for maximum versatility, making it compatible with Vuka Alumina extensions, the Vuka Carbon Extensions as well as most extensions on the market. Features - Fit, security, and adjustability - Above-bar or below-bar mounting system - Compatible with most extensions

Zipp's Vuka Alumina Clip Risers are designed for use with the Vuka Alumina Clip’s above-bar option. The risers are designed to offer a wider range of adjustability within the Vuka Alumina aero-cockpit system. - Sold in pairs - Risers cannot be stacked - Includes hardware

Wheels Manufacturing Wide Chainstay Protector w/ Alcohol Prep Pad keeps your frame's paint looking good and helps quiet any chain slap on the chainstay. Wide design offers extra coverage for larger chainstays.

The Problem Solvers Cross Clamp mounts to the seat tube on your frame so that you can make your top-routed shift cables work with a bottom-pull front road derailleurs. This is a common setup on cyclocross bicycles. Choose the diameter that matches your frame.

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.

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.

- Bolt-On design uses single bolt split collar for clamping - Built in housing guide system for dropper posts - Ingenious ball mounted guide to prevent kinked housing as the saddle height moves up and down - 17Mm collar height with internal stop-Ring, Aluminium and stainless steel hardware: 35G

Replacement microSHIFT bar end shifter mounts allow you to replace broken units or convert microSHIFT thumb lever shifters to bar-end mount. - Compatible with microSHIFT road-pull 8, 9, and 10-speed shifters only - Expander plug compatible with handlebars with internal diameter of 19-21mm

For 3rd generation road shifters: SB-R5XX

Surly Thru-Axles are low-profile, bolted Thru-Axles are specifically designed for use with Surly thru-axle compatible frames. Offered in several sizes, for both front and rear wheels. 12x142 Rear Thru Axle: - Fits: Midnight Special and MDS Dropout bikes including Instigator, Legacy Karate Monkey & Legacy Krampus. 12x142/148 Rear Thru Axle: - Designed for frames with Surly Gnot Boost spacing (145mm), capable of working with 142 or 148mm rear hubs - Fits: Karate Monkey, Krampus, Troll, Ogre, ECR 12x177 Rear Thru Axle: - Fits: Wednesday 12x197 Rear Thru Axle: - Fits: Ice Cream Truck, Big Fat Dummy 12x100 Front Thru Axle: - Fits: Midnight Special 15x110 Front Thru Axle: - Fits: Karate Monkey, Krampus 15x150 Front Thru Axle: - Fits: Wednesday, Ice Cream Truck, Big Fat Dummy

Rack-Locks are one part form, two parts function. Sure, they still look great and do a great job of keeping your seatpost in place, but they also provide a mounting position for the front struts of a rack. - Max torque 3–5Nm - AL-6061 Aluminum - Strong rack attachment points - 34mm-wide rack mount threaded for M5 bolts - Stainless steel pivot and bolt - Available in 30.0, 32.0, 35.0, and 35.4 mm sizes - Black anodized with laser-etched logo - 45g for a 32.0mm collar

All Wheels Manufacturing replacement derailleur hangers are produced in their Colorado shop to exacting tolerances. - CNC machined 6061 aluminum - Black anodized finish - Includes (1) M8 Chainring Bolt, (1) M4x8 Flat Head Screw