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“It’s ridiculous” we hear you say — “You couldn’t possibly need that many.When I started cycling we only had three…” So what’s the deal?

So, I planned on reinstalling a BB dynamo hooked up to a friction shifter on the seat tube.

English threading is designated by the frequency of how many threads are counted along one inch. Metric threading uses the direct pitch measurement in millimeters, measuring between two adjacent thread crests. Unfortunately, some fasteners are “mix and match”, with both a TPI and a metric size, such as Italian bottom bracket threads labeled “36mm x 24 tpi”.

There are standard coarse metric threads which are designated with the letter “M” followed by the thread pitch.

If you haven’t a clue how many gears your bike has, how many you actually need or even how to use them properly, don’t worry — you’re not alone.

We demystify derailleurs and sprockets and explain why in cycling STIs are a good thing to have We’ve all heard it; most of us have probably said it, or at least thought it — why on earth do I need 33 bike gears?