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First you need to figure out what kid of gearing it is, and what's important is the number of sprockets at the rear wheel. I'm assuming that you're talking about a 6 speed rear for the 18-speed and a 7-speed rear for the 21-speed. If that is the case there is a risk that the 6-speed rear has a narrower hub than the 21-speed. This can make it awkward. But the biggest issue is probably the shifters. a shifter intended for 7 rear sprockets will not shift cleanly over 6 sprockets.

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Q: What would it hurt to put a rear wheel from an 18 speed on a 21 speed bike?
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What would it hurt to put a rear wheel from an 18 speed bike on a 21 speed bike?

First you need to figure out what kid of gearing it is, and what's important is the number of sprockets at the rear wheel. I'm assuming that you're talking about a 6 speed rear for the 18-speed and a 7-speed rear for the 21-speed. If that is the case there is a risk that the 6-speed rear has a narrower hub than the 21-speed. This can make it awkward. But the biggest issue is probably the shifters. a shifter intended for 7 rear sprockets will not shift cleanly over 6 sprockets.


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