12 speed cassettes on direct drive trainers

Do you need to use the 1.8mm spacer with the NX Eagle 11-50 cassette?

The NX is same width as Shimano 11-sp cassettes so no spacer needed.

I have a Shimano 12 speed cassette on my mtb. My Kickr arrives today and I already received a SunRace MZ800 12 speed cassette that I’ve been advised will fit right onto the Kickr. I’m a bit worried now as there’s no mention of SunRace in this thread/forum. Will the SunRace cassette fit right onto the Kickr?
TIA, Mark

Shimano 12 speed uses the micro-spline freehub standard and is not not backward compatible with 11-speed freehubs, including the Kickr freehub.

Sunrace do cassettes for pretty much all hub standards - let me know the model number and I can check.

Note that I cant see that Wahoo have released a Shimano 12-speed freehub yet but it cant be far away if they havent.

The NX is a bit different - its specifically designed to mount to Shimano 11-speed in the same way SRAM 12speed cassettes were designed to work with SRAM 11speed freehubs. This was just SRAM’s cunning way to eat into Shimano’s market - SRAM NX doesn’t mount to SRAM’s freehub for this reason.

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Just re-read your post (missed the model # you posted) and it looks like the cassette you have ordered will be fine on the Kickr. The “HG Freehub” is the Shimano non-microspline standard.


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Thanks @Dean. I’ll be fitting it tomorrow or Sunday at the latest so it’s good to have it confirmed that this should fit. Appreciate you taking the time to check this out. Have a great weekend :+1:t2:

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