I have been given a Stronglight 1" headset to replace my 'notchy' Omas one, however on trying to fit the bottom race to the steerer tube I found it was slightly too big, it is marked 26.4mm the Omas one isn't marked so what gives, can I shim it or are different size bottom races available. The Stronglight is an alloy taper roller model I believe A9.
Steve Chambers
Chesterfield
England