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Just wondering re 650b. WTB state that their 47mm horizon tyre on a 650b wheel is equivalent diameter to a 30mm tyre on a 700 wheel. Is it the width at the chainstay limiting the tyre size to 42mm? If using 42mm tyres on 650b does this mean the bike will be effectively 5mm lower than if using 30mm tyres on a 700 rim?
dancing james
42 fits with room as a rule.