Im in the process of putting my new Mavic cross rides onto my Trek fuel ex 9.0. So ive taken the sram casette of the bontrager wheel and fitted it to the Mavic wheel and tightened it up! Heres where the problem is…The casette is loose and when ive measured the two free wheel bodies ive found the bontrager one to be 2mm shorter than the mavic one. In effect, the smallest gear wont pull up tight against the rest of the casette as it only sits on the free wheel body about 75%.
What do i do??
Is there spacers available for this??

Some mavic wheels come with a spacer that sits behind the cassette.

That sounds like what i dont have but need!

Thanks for the quick reply!