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I'm trying to create two wheelsets that I can quickly swap out on the same bike for different conditions. My existing set has a Shimano 105 5800 series 11 speed cassette. They discontinued that so you pretty much can only find the newer Shimano 105 7000 series 11 speed cassette.

While reading a review of the newer series, it was mentioned that:

It's designed to also fit a mountain bike wheel, so you need the optional spacer if you're fitting it to an 11-speed road wheelset.

My question is, will the spacer requirement on the new cassette with my road bike force me to mess with my rear derailleur indexing/etc. when I swap the wheelset/cassette?

Shimano 7000 Cassette

  • Keep in mind that Shimano and SRAM cassettes are interchangeable where you might find a cassette of the desired range. – Carel Oct 29 '18 at 8:35
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    I'm guessing, but different model hubs may place the cassette in a slightly different position anyway, requiring a little rear derailleur tweaking when swapping wheels. – Argenti Apparatus Oct 29 '18 at 13:07
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The spacer is required for 11-34 cassette only, same story as CS-R8000 11-34. The 34t cog hangs over freehub body, which allows to use the good old 8-10 speed HG freehub body. For a note, Shimano MTB 11 speed cassettes do not require 11-speed specific freehub body either.

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My question is, will the spacer requirement on the new cassette with my road bike force me to mess with my rear derailleur indexing/etc. when I swap the wheelset/cassette?

To be honest, I did not run this cassette, but it would make no sense to change offset just because it uses a carrier spider instead of cogs riveted together. At worst, you'd have to put a thin spacer under the cassette when swapping it between 11-34 and smaller range options like 11-28.

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