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Look on the incomparable Sheldon Browns site for guidance, look under the heading "width considerations" about 3/4 down the page.
http://www.sheldonbrown.com/tire-sizing.html
freezing77
dancing james
Is there an easy way to predict tyre size?
Last year I ordered WTB resolute 650b tyres from Sigma and then forgot about them. Last week tyres suddenly arrived.
My Isen is specced to take 42mm tyres, the wtb tyres are allegedly 42mm but they do not state for what internal rim width.
I don’t want to remove the wtb tyres from their packaging and attempt to install them on my wheels if they are unlikely to fit as I doubt Sigma would accept them being returned.
So how do I predict the likely size of the tyres? I am using a light bicycle hookless rim with a 22mm internal width.