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Ride a 299mi 12hr or lose a race by 1sec and ask me again about whether or not the gains are worthwhile :)
I was asking because I think I have a couple of race tyres here that I'll probably not use and you might be able to make use of them. Vittoria Corsa Speed TL in 23mm. I think they were the fastest things you could buy for a while.
Do you want a faster tyre?