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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.
edscoble-
IMO 'real world' comparisons for me would also include me coasting, lifting my bum, and holding my breath on every other pothole on 23, vs gently shifting weight and still pedalling on 42.
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There is a compromise. You're only considering rolling resistance. 42mm tyres are significantly less aero than 23mm and this will be a not insignificant drag at higher speeds.
And if one's using aero rims, there's none optimized for such fat tyres.
kvragu
Netakure
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