SRAM XD or XDR Driver

I’m building a Salsa Warbird with Force 1x and a TRS 9-46 cassette. Which driver do I need?

Thanks

XDr is a road standard, it’s a couple of mm wider than XD. Means it can accomodate 12 speed SRAM XD road cassettes, or 11/12 speed MTB ones with a wee spacer in behind the cassette.

Basically, if all you ever plan to use is 11/12 speed MTB Cassettes, then XD

If you want the option of 12 speed road cassettes, XDr and use the wee spacer with your E13

I like the sound of your bike.

Thanks for that.

I’ve been waiting ages for the Warbird frame and it’s just arrived at Keep Pedalling. I’ll pick it up in a couple of weeks and now have the fun bit of working out components for the build