Thread: MTB Commuter Sizing?
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Old 02-21-18 | 09:36 AM
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cyccommute
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Originally Posted by Wendell F
Sounds like the most important thing is to look for something with an effective TT length of 20.8" like my current road commuter (and ride before buying if possible).

Thanks!
The 0.8" part of that measurement is probably unimportant. Look for a top tube that is "around" 21". Varying by 1/2" to even 3/4" either way probably won't be all that noticeable.

Originally Posted by RubeRad
I have two mtb at home that are labeled as 20" (with a sticker on the seat tube), but different top tube angles and lengths make them vastly different size bikes.
I would doubt that they are "vastly different" enough that someone who rides a 16" mountain bike could use either one of them.

On the other hand, I have five 20" mountain bikes that aren't "vastly" different in the way that I fit on them. That's from a cruiser type mountain bike to two dual suspension bikes.
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