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I have a pair of these, have done for a month, and despite getting a puncture every ride I did on my Pagri Roubaixs so being slight hesitant about Challenge's puncture resistance claims, these have been fantastic. Including riding The Hell of North London, and commuting daily for a month, I've had 1 puncture, which I don't think is too bad for tyres that are this comfy
they're a great pro-muter tyre...
I meant the SCs I think.
I have the clearance for the Stradas. The main thing putting me off if the cost and this review where they look a bit delicate:
http://smutpedaller.blogspot.co.uk/2014/06/tyre-review-challenge-strada-bianca.html
They look comfy though...