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I have an ultegra 10 speed on my trainer wheel. I couldn't be bothered to put the spacer in and now I really need to be careful of shifting too far to the right - the chain goes off into the gap. Fine on the trainer; would be a bit reluctant on the road.
I'm no mechanic but you'd probably know as above if the spacer was really required.
10 speed cassette is slightly wider and by not placing the spacer the derailer is forced very close and sometimes in to the spokes when shifting in to the low ratios. The spacer is to stop this from happening.
10 speed cassette is slightly wider
Do Easton`s require a spacer too?
Spacers are wheel specific, rather than cassette specific, are they not?
By that, I mean the spacer will have come with the wheelset (if you bought a wheelset), rather than the cassette.
As usual, when it comes to these things, I am often wrong however, but that has been my experience with road bikes thus far...