Functional bikes. Not Porn not Anti

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Jaap in reply to @Chak

what do you mean by rim width? outer, inner or bead seat?

If you meant inner, I agree but would maybe stretch it to 60% - 65%

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edscoble in reply to @Jaap

inner width, like 18mm inner, so a tyres 50% of that size would be a 36mm one (thus 32-38mm).

Personally, I agree with your measurment (60-65%), I did ride on 42mm with 17mm internal and work out surprisingly well because the tyres is already a good balloon shape.

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Jaap in reply to @edscoble

I was talking about it the other way, if you have a 18mm inner rim width I wouldn't mount any tyre smaller than 28/30mm (or else you're gonna run into trouble mounting them after a flat). Bigger is just fine!

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