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 
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Hi @Pablo_Hernandez1 welcome to Zwift forums.
Thanks for the information. I’ll update the original post. Also - Elite offers a Microspline freehub body now. It’s taken a while, but they’re getting caught up to more recent drivetrain developments.
Hey,
Hope somebody might be able to help.
I have a 12-speed SRAM force groupset on my bike.
I bought an elite direto xr -t smart trainer and the elite sram xr-xdr freehub but if I try to put this on it only goes halfway.
Thanks in advance!
I didn’t see an Elite document relating to installation, but the advice from Wahoo is exactly what I was going to say (see step 4). Slowly rotate the freehub in the anti-clockwise direction while pushing on it. The purpose of this is to depress the pawls while installing it. I have not done this with the Elite trainer so this is sort of generic advice.