I’m thinking of getting a new bike and a direct driver trainer. If I get a 12 speed SRAM I know I will need an xdr freehub, but will I be able to fit a 11 speed shimano cassette with a spacer so I can also run my current bike on it? Will the rear hub now be too wide for the 11 speed? I have a trek domane sl5, am looking at getting a speedmax axs when available, and a kickr direct drive.
freehubs are totally different so the cassettes arent interchangeable.
I use erg mode almost exclusively, which means I dont need to change gear. Because of that, I use my sram axs 12 speed bike with a shimano 11spd cassette and freehub on the trainer. For the odd occasion that I race on zwift then I take the axs cassette off my bike and fit it to the trainer with the xdr freehub that I also have.
What do you mean by “standard”? All freehubs are specific to a certain manufacturer(s). You’d buy a wahoo xdr driver for your kickr in the same way that you’d need a mavic xdr driver for your carbon cosmics
I didn’t know they weren’t cross-compatible from wheel hub to wheel hub. Never tried putting one from the Enves to the Rovals. I just know that the Roval XDR hub wouldn’t fit the trainer. Good info. Thanks.
They aren’t as specific as you think they are. The Roval one is likely just a DT Swiss one. There aren’t that many different variations out there in mainstream hubs. As long as the freehub axle is the right size (15mm / 17mm) and the mechanism (pawl, ratchet, etc) is about the same, the dimensions of the freehub body really dictate everything else.
If it fits on the axle snugly, the pawls go in, the end cap goes together right, and it works smoothly - it works.
If you’ve got a free hub sitting there and a trainer sitting there, it’s $300 saved for 2min of trying.
Pawl hubs are 80% of hubs, the Kickr has the more common axle size. It’s probably a 60% chance it props on and seems to work and a 95% chance after that. It’s not like it’s going to seem to work and then destroy everything.