Senior Member
Join Date: Mar 2015
Location: New Zealand
Posts: 1,053
Bikes: Gunnar, Shogun, Concorde, F Moser, Pete Tansley, Rocky Mtn, Diamant, Krapf, Marin, Avanti, Winora, Emmelle, Ken Evans
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the recent switch to 'wider' tyres on road bikes is semantics
I went from '25mm' gp4k to '28mm' gp5k and both measure 27mm on 19mm rims. Nothing changed.