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@gbj_tester
20s are going out of fashion, for the reasons discussed on the "Fat Tyres are Faster" thread. The Conti GP Supersonic is good for racing, get the current black ones not the old anthracite. The only reason for buying a 20mm tyre is an old track frame with ridiculously tight clearances or a Hed 3 used for racing, as it's about the only fast wheel which is definitively quicker with a skinny tyre.