Thread: 25s vs. 23s
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Old 02-14-19, 08:47 PM
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Once you start dropping the pressure the wider tires are going to have higher rolling resistance, not less. You've still got to maintain the pressure to reduce rolling resistance. And aerodynamically, the narrower tires are faster.

I ride and race 23s. I do time trials (very infrequently) with 21s.
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