Trying to help someone else so they can avoid the research and jump straight to it.
The answer you seek is in item #3 below!
For starters, I have a 2021 Specialized Fuse Expert. This isn’t my main bike, but I’m refreshing it to run single speed this summer.
What have I learned?
1) Shimano MTB drivetrains are absolute garbage – 2 bottom brackets trashed before moving it to SRAM DUB and SRAM Crank/Spindle – 2 derailleurs SLX and XT both trashed in about a year of riding
2) Specialized Fuse is a great candidate for Single Speed except for the wheels. More Shimano trash. The MT510 rear hub is Microspline only. Hyperglide (HG) is the most compatible with Single Speed Cogs. Wheels Manufacturing makes an adapter but it’s expensive and limited to three Cog tooth variations
3) Specialized Branded hubs appear to be Bear Pawls hubs. I upgraded my wife’s 2022 Epic EVO Comp with Zipp Carbon Wheels. This left a decent set of wheels (sans Shimano) available for the Fuse. The Specialized branded hubs fit perfectly (axle conversion up front needed due to Rockshox 30mm vs Fox 19mm). The Epic donor wheels have a SRAM XD freehub. But… I found a Bear Pawls Hyperglide (HG) freehub that slides right in place. I think you can buy Microspline freehubs for this hub as well (if you like running junk)
I’m sure this only applies to certain years and bikes, but it does work.
Specialized: S202100001
I bought mine from performance bike.com
by jetman581