That's correct, shims down a 1 1/4 pace crown to allow the use of a 1 inch steerer.markjohnson76":cl1qu5kz said:ishaw, am I right in thinking that shim will allow a set of pace forks with a 1" 1/4 crown to use a 1" steerer? I have a set of RC35 on an orange with a 1 1/4 head tube and want to use them on a roberts with a 1" head tube. I have the steerer.