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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!

The Problem Solvers BB30/Press-Fit 30 Adapter Kit consists of DuPont Delrin (a tough, light type of plastic) pieces that allow you to use your external bottom bracket-style crankarms (24mm spindles, such as a Shimano Hollowtech II crank) with newer BB30 and Press-Fit 30 bottom brackets. Please contact us if you have any questions about compatibility.

The Problem Solvers Chain Tensioner is a handy device when you're building a singlespeed bike and need to remove slack in the chain and keep it running smoothly. It's made of light and durable CNC-machined 6061 aluminum with steel hardware and has efficient, long-lasting nylon pulleys. It simply screws onto your frame's derailleur hanger. It even lets you adjust your chainline, too.

ReMatch adapters are designed to integrate different generations of Shimano Brakes to Shimano Shifters. Rematch Adapter 1.1 connects Shimano I-Spec A/B shifter to I-Spec II brake. - Made from CNC Machined T6061 Aluminum - Anodized Black - No additional hardware needed ReMatch 1.1 is NOT compatible with Deore M610 or SLX M670 shifters

ReMatch adapters are designed to integrate different generations of Shimano Brakes to Shimano Shifters. Rematch Adapter 1.2 connects Shimano I-Spec A/B brake to I-Spec II Shifter. - Made from CNC Machined T6061 Aluminum - Anodized Black - Includes all necessary hardware for both I-Spec A and I-Spec B brake - No additional hardware needed

• Allows the use of downtube shifters on bikes without downtube shifter braze-ons • Compatible with 9/10-speed Shimano shifters • 31.8mm clamp with shims for 28.6mm tubes • Shifters not included

The Problem Solvers Direct Mount Adapter gives you a place to install direct-mount Shimano and SRAM derailleurs. It was initially developed for standard mountain bike frames with 68/73mm wide bottom bracket shells, and is equally suited to fat/snow bikes, where their 100mm wide bottom brackets make front derailleur applications a little difficult. The adapter is made of light and durable 6061 aluminum.

The Problem Solvers Head Tube Reducers resize your head tube to accommodate different size forks. These fine aluminum reducers are designed for traditional, external-cup headsets. Please contact us for any questions about compatibility with your bicycle.

MisMatch adapters allow users to mount Shimano & SRAM brakes and shifters on one clamp. MisMatch Adapter 1.0/1.1 attaches SRAM shifters to Shimano I-Spec-A or I-Spec-B brake lever clamps. MisMatch adapters and the ever evolving “standards” it attempts to integrate between SRAM and Shimano is a confusing subject. Shimano brake and shifter mounting options have changed a lot, going through four mounting systems from 2011-2016. Shimano components have a model number printed somewhere on the brake and/or shifter, and this is the best way to determine what you own and what adapter you need. MisMatch 1.0/1.1 fits Shimano brake levers:BL-M985, BL-M988, BL-M820, BL-M785, BL-T785, BL-M675, BL-T675, BL-M640, BL-M596, BL-M820-B, BL-M785-B, BL-M675-B, BL-M640-B, BL-M615, BL-M506 - Annodized Black

I-SpecBar Clamps are a one-piece hinged clamp adapter that allows users to mount I-Spec compatible shifters or dropper levers onto the handlebar, without requiring an I-Spec brake lever. - Sold individually, the clamp can be mounted to the right or left side - Hinged clamp for easy installation without removing other components - Black Anodized, CNC AL-6061 Aluminum - Compatible only with Shimano I-Spec II compatible shifters or dropper post remotes - 23g

The Problem Solvers GXP Spindle Adapter Kit lets you adapt a GXP crankset to a BB30 or Press-Fit 30 bottom bracket. It's used with the Problem Solvers BB30/Press-Fit 30 Adapter Kit, which is sold separately.

Problem Solvers' Chain Spy is a chain retention device that keeps a watchful eye on your chain while you focus on blasting along the path ahead. Choose between the 31.8mm clamp model, or the Direct Mount model, depending on your bike's needs.

The Problem Solvers Chain Tensioner is a handy device that lets you cleanly install a derailleur on frames without a derailleur hanger. It's made of light and durable CNC-machined 6061 aluminum with steel hardware. It's designed for use with rear-facing horizontal dropouts and 10mm rear axles.

Mounting electronic shifting systems challenges the most prolific of bike mechanics. When small frames, recumbents, or adaptive cycles are involved, the standard battery mounts don't accommodate. This mount accepts the small Di2 or EPS battery mounts and comes with zip ties to attach that battery anywhere on the frame you need it. Tech Details: Machined AL-6061 main body Includes: four zip ties, rubber shim and two M4 bolts

The Problem Solvers Handlebar Accessory Mount comes in handy when you don't have enough room on your handlebars for mounting all your accessories. It fits onto all handlebars, holds tightly and gives you 80mm of width for mounting more of your essential devices where they're easy to see and use (photo).

Technical Details: • Spaces rotor outboard for mounting 135mm REAR spaced hubs on 135mm FRONT spaced forks • 4.8mm thick, includes longer mounting bolts • One-piece alloy spacer, anodized black

Downtube cable adjusters from Problem Solvers. - Braze-on downtube adjusters for road shifters - Contoured to fit traditional sized steel downtubes - Black Finish

Problem Solvers' Cassette Cog Carrier (CCC) bolts on to a splineless single-speed cog to give you a wide, Shimano-splined cog to run on your freehub body. The wide profile won't damage your freehub body. Tech Details: Aluminum carrier with steel cogs

The Problem Solvers Travel Agent amplifies your braking power so that you can mix road, mountain and cyclocross brakes and brake levers. Instead of buying new levers or brakes, just install a Travel Agent and you're good to go. This trick gizmo is made of quality 6061 aluminum and is available with and without a built-in adjustment barrel. It works with cantilever brakes, road dropped handlebars, and Shimano STI and Campagnolo Ergopower levers.

The Problem Solvers Center Lock Rotor Adapters are CNC-machined aluminum adapters that allow the use of 6-bolt rotors on Shimano's Center Lock hubs. There's a model for standard Center-Lock lockrings and one with a pinch-bolt for hubs that have damaged threads.

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 Problem Solvers Micro-Adjustable Headset Spacer goes on the fork (it requires 10mm of clearance on the steerer) and locks in place to retain your headset bearing adjustment. This makes it possible to run your fork and headset without a star nut or compression plug. This 2-part threaded component is made of CNC-machined aluminum with a small bolt for tightening, so it's light and durable.

The Problem Solvers Double Chainring Bolts include 5 chainring bolts and nuts that are 8mm wide. This is the right size for most double-chainring setups. These chainring bolts are made of aluminum and feature dual-hex heads for easy, secure installation.

Available in the most common sizes and thicknesses-in small or bulk quantities, Problem Solvers headset spacers help riders get their stack height just right. - Made from Aluminum, anodized or polished finish, without logos - 1-1/8" Diameter - S.H.I.S. Stem Clamp Diameter: 28.6mm

Available in the most common sizes and thicknesses-in small or bulk quantities, Problem Solvers headset spacers help riders get their stack height just right. - Made from Aluminum, anodized or polished finish, without logos - S.H.I.S. Stem Clamp Diameter: 25.4mm

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.

Problem Solvers Pog top caps are machined aluminum with a 5 or 10mm spacer integrated as one piece. This makes for a clean, finished look when mounting a stem below the top of the steerer tube. - Bolt not included - 10mm available with or without logo - 5mm available without logo only

The Problem Solvers Quick-Release Nut Light Mount is an ingenious solution when your handlebars are too crowded to accept a light. This fine CNC-machined aluminum post simply screws on in place of your left, front quick-release nut to provide a great place to mount your light. Lower light mounting improves your depth perception and shows more details of the road condition ahead, too.

The Problem Solvers Shifter Boss Covers are perfect for covering up the down-tube shifter bosses when you're converting a frame with them to a singlespeed/fixie setup. They're made of light, durable aluminum and sport a nice polished finish.

The Super Booster rear hub spacer kit is designed to give your 148mm rear thru-axle hubs the extra boost they need to fit any 157mm frame.