11 Speed SRAM cassette question
 

My daughter picked up a used 2016 Rhyme FSR Expert Carbon 650b a while ago. She rides pretty steep stuff in Idaho. Would like to to a 10/11 - 50T cassette.

I believe the rear set up is Roval Traverse 142+, SRAM XX1 driver body, 12mm thru-axle, 28h. With this drive body, is the only option staying with SRAM and limited to 10-42 cassette.

If I am correct, could she change the drive hub and get a Shimano cassette with 50T or other brand hub and stay 11 speed?
Are there other options, besides a 12 speed drive train upgrade?
Also, I would guess she could go from 30T to 28T on the crank?

The XD compatible 11 speed cassette is 10-42, as far as I’ve ever seen.

Wolf tooth used to (maybe still does) make a cog that you can replace the 42 with a 44, for a bit more range.

If a modern 29er is running 32 with a 10-52, she should be able to approximate that with a 10-42 and a smaller chainring. She’ll definitely lose higher gears, but that usually doesn’t matter much as she’ll be descending when going speeds to utilize those high gears.

Otherwise, yeah, get a new wheel for Shimano cassettes and there’s all sorts of generic ultra wide range option online. No clue if they’re well made. I’ve had good luck with Sunrace.

With the XX1 driver, you're not limited to 10-42T. SRAM makes an 11-speed 10-50T cassette (NX Eagle) that'll fit.