Buy Q-Tubes 20 x 1-1/8 - 1-3/8 (451 ISO) 60mm PRESTA Valve

Customer Ratings:

I don't know if they don't know how to measure in inches in Taiwan or what, but I've had a couple of these tubes (the only thing the local bike store carries in this size, unfortunately) and they're uniformly too long. It's nearly impossible to get these in a 20" tire without the things kinking all to hell. They just don't fit. It's like they're designed for a 21" or 22" wheel.

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I have a Pacific Reach folding bike which uses these offsize tubes. These are perfectly adequate basic tubes for this wheel/tire size. I have no complaints. It's a bike tube, after all!