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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 Cross Hanger is the perfect front brake cable hanger for your cyclocross bike with cantilever brakes. Designed for easy installation and maximum braking power, this light, durable aluminum piece comes in a version for headsets with standard spacers and another that's Interlok-compatible for Cane Creek headsets.

The Problem Solvers Seatpost Clamp with Rack Mounts is an ingenious adapter that gives you a super-secure and clean way to mount a rear rack on your bicycle. This light and durable aluminum piece simply takes the place of your seat tube collar. It includes a stainless-steel binder bolt and 2 5mm screws for rack attachment.

The Problem Solvers Seatpost Shim is what you need when your seatpost is a little too small-diameter to fit tightly into your frame. It's made of light, durable aluminum and has a lip on the top so it won't slide down inside the frame during installation.

The Problem Solvers Single Chainring Bolts include 5 chainring bolts and nuts that are 6mm wide. This is the right size for most single-chainring setups. These chainring bolts are made of either aluminum, stainless steel, or chromoly.