The answer for our customers

700 C lightest carbon bike wheels-XBIKE provide you the best carbon wheels

Now one of our customers just bought a used 21 speed mountain bike that he want to kind of customize and wanted to know is there such a bike or a series of parts to allow him to build one past 21 speeds and if there is, what is the highest speed bike, or He would guess the largest geared bike that I could build ?


I answer him, " The only way you will be able to get more speeds is to change your rear end. Bikes have been made with 8, 9, 10, and 11 gear cassettes for a few decades now. The issue for you is whether they will fit inside the bike's rear triangle. If you have access to a suitable measuring tool (micrometer is best), measure inside the rear wheel dropouts.

If the measurement is 130 mm or more, you can fit more than 7 gears. Then you'll need to determine if your rear wheel can handle a cassette with more than 7 speeds. If it can, THEN you will need to get a new rear derailleur and shifter that matches the number of gears you choose. If it cannot take more than 7 speeds, you'll need a new hub and spokes at the least, or a new wheel."

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