• Sorry but no way a 40c tyre is faster than 23c in tarmac. Spent years commuting with big slicks but the days I was on the road bike was faster. Tried in group rides as a winter bike too, can hold with the fast boys but always was an extra effort

  • Is your winter bike as light as your summer bike? As aero?

    (No one is arguing that 40c is faster than 23c, which is why no one races on 40c. Rather pointing out that for a recreational rider the difference in speed, whilst there, is substantially psychological)

  • 23mm is a lots slower, I’d wager a good 40mm actually be better than the horrifically small 23mm that a lots of tyres manufacturers nowadays no longer make.

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