bike wrench

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A place to ask bicycle repair questions, and for bike shop monkeys to share advanced non commercial wrenching resources (no YouTube self promotion). This is only for repair related topics.

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TIL that 27" tubes can work on a 29" rim. (pawb.social)

submitted 2 weeks ago by OwOarchist@pawb.social to c/bikewrench@lemmy.world

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When my girlfriend suggested we take the tubes off an old 27" bike to fix the flats on my 29", I thought she was being crazy and overly cheap. No way it would work. Surely I'd have to go out and buy some 29" tubes.

But fuck me sideways, it did work, and I'm currently riding just fine with 27" tubes in my 29" tires. Wasn't even that hard to get them on.

So I guess that's just a PSA for everybody ... apparently, tube sizes aren't really rules, they're more like guidelines.

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[–] fallaciousBasis@lemmy.world 3 points 2 weeks ago (1 children)

What's really crazy...

27" → 630 mm (old road standard)

29" / 700c / 28" → 622 mm (mainstream)

27.5" / 650B → 584 mm (had one of these, can also fit a 26" tires in some cases, which are typically 559 mm)

Now they're doing 32" with 686mm beads.

[–] ALiteralCabbage@feddit.uk 1 points 1 week ago

This is why ETRTO matters - everyone should know 622 is 29, 28, and 700c (and honestly, using the a, b, and c, "standards" is insane anyway.