Old 12-16-14, 03:20 AM
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Sixty Fiver
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Seating wider tyres on the widest rim possible improves their performance... using too narrow a rim pinches the tyre inwards at the bead and at lower pressures the tyre can become squirmy while running the same tyre on a wider rim allows for better performance at lower psi.

There was a trend when mtb rims were almost as narrow as road rims but ran wider tyres, although a narrower rim works well on a skinny road tyre to lower drag, mounting a fatter tyre on these skinnier rims eliminated that advantage due to the greater frontal area.

Although a wider tyre will increase drag by a small amount, a well designed tyre with better tread compounds and a well made casing can still roll out rather quickly.
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