Help how do i measure rims

[biggs682]

please help i am trying to buy some tubs for a pair of wolber super continetal rims i have been given , but there are no markings on the old tubs or rims , how do you work out what size is required ?? maritn

 

[MartinC]

There isn't much choice with tubs. They're mostly 700c (ERTRO 622). Some are for the smaller front wheels (650) that you see on TT bikes sometimes - but I doubt you've got one of these.

Width is mostly 22/23 mm for RR or 19/20 mm for TT. You'll get some specialist Paris Roubaix tubs that are fatter and cyclo cross ones that are fatter and treaded.