Smaller tube - 19' to 21' rim?

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Rooikat

Race Dog
Joined
Feb 21, 2010
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Pretoria
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Honda XR500
A niggling question for those dawgs that have tried this. Can you fit a 19" tube to a rim meant for 21"? Has someone done this successfully and for how long will it last?

I am still waiting for a 23" tube from my son in Belgium, but I want to get going and ride until at least middle June. Will a 21" tube work, and for how long?
 
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