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Tires... How wide will my rims allow them to go?

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Tires... How wide will my rims allow them to go?

Old 05-05-15, 06:34 AM
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part_robot
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Tires... How wide will my rims allow them to go?

Hello

I have a 2010 Langster with what I believe to be Mavic rims (I can't tell the model as I stupidly removed the stickers a few months back). It currently has 23mm tires but I'd like to go up to 28mm to help with the pot holes in London. Is there a way to work out the maximum tire width they will allow? The rims are distinctly narrower than those on my Synapse (which takes 28mm easily) so I'm not sure.

Thank you!
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Old 05-05-15, 06:38 AM
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You're going to run into frame/fork/brake-caliper clearance issues before you need to worry about what the rim will handle.
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Old 05-05-15, 06:54 AM
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+1,

The limiting factor on tire width is almost always one or more of these three, and rarely the rim. You can increase tire width by the amount of vertical clearance, or twice the side clearance. However you need to allow for variance in tires, and the fact tha they tend to stretch a bit as they age. Also leave some room on the sides to allow for a wobbly wheel, though you can work very close to the brake. (one of my bikes has brake/tire clearance on less than 1mm)

BTW - since you asked about it, here's a chart showing optimal tire widths for various rim widths. Note there plenty of fudge room to either side.



Rim widths are inside width, tire widths are overall.
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Old 05-05-15, 07:14 AM
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Perfect, thank you both Really useful - especially the chart
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