- Rim width V tyre width, and effect on seat tube clearance
I’ve a new bike and the rims are 19.5mm internal width, and the tyres are 2.35/60mm.
I’m definitely at the narrowest rim suitable for these tyres, and I’m running them fairly soft as the bike is rigid. I’m also running tubeless so there is a small worry that I will be able to roll/burp them off the wheel. Finally, the seat tube clearance is fairly tight, around 6mm.
It looks like the recommendation is that the rim sweet spot should 30-70% of the width of tyre, which would be 27-30mm. This will make a squarer tyre and be more stable at lower pressure, and going wider by 10mm would make the tyre about 4mm wider.
However, I’ve not seen anything that suggests how much (if at all) the tyre height (and therefore seat tube clearance) would reduce. The tyre will square off but will the overall diameter change much?
Wheels are a couple of years old but mint condition as the bike was never ridden, so I suppose the choice is sell now and buy wider rims, or save some pennies and stick with them.
Thoughts anyone?Posted 1 month agotjagainMember
damascus – you can use lower pressures without tyres rolling off the rim and squirming with wider rims
Big John – I agree with you on circumference – wider rims will make no difference – all you are going is moving the beads apart unless you put such wide rims on that you totally distort the shape of the tyre and they you would get wrinkled sidewallsPosted 1 month ago
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