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Old 12-06-18, 09:05 AM
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The critical spacing is between the inside of the dropout and the first cog. If it is too wide you should add a spacer to the back of the cassette so that it is moved closer to the frame when the locknut is tightened. If it is already too close, you'll have to swap the last spacer with a narrower one. I would look to increments of .2mm either way. You could also add the spacer to the wheel if the trainer cassette is closer to make the wheel line up with the trainer instead. .2mm doesn't sound like much but it could be the difference between perfect and noisy. I'm assuming that you have like to like cassettes, 11sp to 11sp or 10sp to 10sp. And if you have 10sp you will need a much larger spacer in the back of the cassette. I think it was 1.8mm to make up for the missing cog and space.

I use my carbon bike on my Kickr, I never gave it a thought. There is less stress on a trainer than on the road.
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