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Old 12-03-2012, 09:00 AM   #18
YamaGeek
Ancient trailbike padwan
 
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Joined: Jun 2007
Location: western oregon
Oddometer: 5,959
29" wheels on MTB's are actually used because they 'span over' dips and bumps that would possibly swallow a 26" wheel. There is little if any centrifugal advantage to using a slightly bigger diameter at the rotation speeds turned on these bikes. It's more about increasing your contact patch.

There is a downside to making spoked wheels bigger, they become weaker and are less able to hold their true when subjected to abuse.
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