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Old 02-12-18, 11:56 AM
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That chart is useless for the newer rims. These rims are wider because as HTupolev stated, it's for aerodynamic purpose, to reduce the transition from rim to tire. The bulbous shape of the tire is where most of the turbulance/aerodynamic issues occur on the wheel. That's why the rims are getting wider, 27mm rims with 28mm tires. Of course the wider tires have the added benefit of reduced pressure = comfort and wider surface area = reduced rolling resistance. For 28mm tires for example, I would definitely look at minimum 25mm wide rims.

Of course these are not set rules, if you want to ride 32mm tires on 21mm rims, and it works, go for it.
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