....for a kickr core, which is sram flattop chain compatible and fits on the older splined driver (not microspline). I would replace the driver with a sram one, but I don't want to splash much cash at the moment.
So it’s a HG driver?
In the grand tradition of not answering the question you asked, would a Zwift Cog and Click work for you rather than a cassette? Totally depends on how you use the trainer
PG-1231? "Cheap" on Merlin.
....for a kickr core, which is sram flattop chain compatible and fits on the older splined driver (not microspline). I would replace the driver with a sram one, but I don't want to splash much cash at the moment.
If its a HyperGlide driver, best option is to go for a SRAM NX cassette I would think.
Currently £65 on Merlin which is a bargain, normally 80 is the cheapest you see them at
Does the flat top chain not mean that the cassette has a slightly different geometry? Larger rollers, I think? While chainrings are more tolerant of the difference, I don't know if cassettes are.
If not, you might be stuck with very expensive options only
....for a kickr core, which is sram flattop chain compatible and fits on the older splined driver (not microspline). I would replace the driver with a sram one, but I don't want to splash much cash at the moment.
If its a HyperGlide driver, best option is to go for a SRAM NX cassette I would think.
Currently £65 on Merlin which is a bargain, normally 80 is the cheapest you see them at
I don't think NX are compatible with the flat top chains. You need to move up the model range for that, but then you lose HG freehub compatibility.
The PG-1231 I mentioned above is HG and D1/E1 flat top compatible, but it's a gravel cassette so only 11-44t.
Personally I'd go NX with a normal chain.
Oh, good spot I didn't think about the flat top!
Yeah, I would go with the NX and a normal chain as well
Doesn't a flat top chain also indicate slightly different cassette spacing? T-Type only works with T-Type AFAIK due to the position of the cassette on the free hub.
T-Type cassette sits further outboard (out towards the spokes) by about 2.5mm due to its designed 55mm chainline, while standard Eagle uses a 52mm chainline,
The fact you say flat top chain makes me think your probably using a bike with T-type.
I think trying to mix T-type with a HG driver could put you on a hiding to nothing. I'd consider using a Zwift Cog as above. Especially if this is a bike you want to fit/remove from your trainer for indoor/outdoor riding.
Why are you splashing cash at all. Can't you use any old cassette in the shed (or that already attached to trainer) and just not change gear and use ERG mode? That's way cheaper. Don't know if you are using your best bike on the trainer or a different one. If using your best bike I'd be tempted to have some sacrificial chainrings or cranks and chain for indoor use if you're not taking that bike out all the time