you need to get a set of tubular-to-clincher shims. get the right size for your rims though -- make sure it's a tight fit. and then go one size up with the tubes and tyres.
@teddy started
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you need to get a set of tubular-to-clincher shims. get the right size for your rims though -- make sure it's a tight fit. and then go one size up with the tubes and tyres.