4000s. 25s
I've used them a lot in the past, quite like em. Easy to get on and off, not too bad for punctures. Fast. Worried about them doing 4000km though - guess I can always get some new ones half way through. Will probably go for 28s though.
I wouldn't recommend something I haven't used and abused, to success.
@gillies started
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4000s. 25s