#!markdown
You can do it with a mountain bike cassette, Wolf Tooth Tanpan, and a Shimano
Clutch derailleur.
The smallest XT/XTR 11-spd cassette that I know of is 11-40t which may not be
ideal jumps but I don't think it's terrible if you're building a custom from
scratch.
It's 11-13-15-17-19-21-24-27-31-35-40
I know it's a lot more complicated than just buying a freehub body but I'm
looking at a similar re-use of a 142×12 and 100×15 hubset (because it's not
Boost compatible) and that's currently my preferred solution.
Dec. 19, 2016, 10:40 p.m. - DrewM
#!markdown You can do it with a mountain bike cassette, Wolf Tooth Tanpan, and a Shimano Clutch derailleur. The smallest XT/XTR 11-spd cassette that I know of is 11-40t which may not be ideal jumps but I don't think it's terrible if you're building a custom from scratch. It's 11-13-15-17-19-21-24-27-31-35-40 I know it's a lot more complicated than just buying a freehub body but I'm looking at a similar re-use of a 142×12 and 100×15 hubset (because it's not Boost compatible) and that's currently my preferred solution.