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Originally Posted by PhilD
Just going from experience, nearly every popped bead I've seen is when the rim is at the narrow end of the recommended rim width. Obviously going too wide will give you problems too.
I really don't know the science behind it, but while you are putting more force on the seat area with narrower rims, when aired down you have to counter that with the pull from the sidewall bulge and the fact you now have a sharper angle between the sidewall and bead, causing the tire to deform away from the bead.
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You're blinding me with science! Makes sense though.