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Brommers
I picked up some new 11 speed wheels for my 7 speed. Right now its cassette is on some wheels from a 9 speed donor bike, so I believe it should have a 4.5 mm spacer on the freehub at the moment. To go from 9 to 11 how much extra spacing do I need? Sheldon Brown seems to suggest 0.85 mm but I've seen 1.85 mm elsewhere. My new wheels did come with a 1.85 mm spacer so it would be helpful if it were the latter. (don't have a cassette tool to hand to try it yet)