They slipped it under our noses inside an April Fool’s tease, but the UK-made Ratio Mech mechanical rear derailleur is real.

Derailleurs are the transmission of your bike. When you shift, they guide the chain to the correct gears. Whether you’re fixing a particular problem with your chain or simply giving the system a ...

There have been countless innovations to the rear derailleur over the years. These have included compatibility with an ever-increasing number of sprockets, the introduction of indexed shifting, STI ...

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