SLX cassette fouling on Trek rail 9 drop out - whats going on??

[Sofaboy73]

converting my rail 9 from sram GX drive train to shimano XT / SLX mix (not getting on with eagle). have had a new wheel built up with microspline free hub (hope pro 4 boost / 148) as had virtually destroyed the soft as cheese bontrager rear rim anyhow. however once the cassette is fitted the lock ring fouls / sticks on the all in one dropout / mech hanger as the hanger protrudes quite a lot.

cassette is deff seated correctly. lock ring is tightened as much as i dare before stripping the thread and the dropout / mech hanger is seated correctly in the frame, however it fouls that badly that you cant easily turn the cassette once the thru axle is tightened??

i'm at a bit of a loss, i can see the problem but i dont know what the solution is. the sram XD drive with GX cassette doesn't have a lock ring that sits proud, but the tight tolerances of 12 spd means the SLX cassette wont turn. its almost like the hub end cap is a few mm too short, however its a brand new hope pro 4 boost / 148 mm hub.

any ideas? its almost like it needs a different drop out to run shimano 12 spd, but surely not??

 

[Frankenbetty]

End caps on the hub the wrong way round possibly? They might be sided and fitted the wrong way round. It only takes a mm or two to screw things up and it’s not always visually obvious
ive no idea about the new Hope stuff but I’ve seen similar infuriating things over the years.

 

[Jackware]

Was the original cassette 10-50 while the SLX/XT is 11-50, so the smallest cog is a larger diameter?

On other bikes I've had the Sram and Shimano hangers were different as well, are you just changing the cassette or derailleur as well?

 

[Doomanic]

The hanger on the Rail is the same for Shimano and SRAM according to the parts diagrams.

 

[Gazzaaitken]

I thought sram and shimano mech hangers were different as well, could be that 12 speed is the same though?
Get a picture from a rail with shimano fitted?

 

[Sofaboy73]

problem solved, the freehub came with the wrong end cap. swapped at the LBS and now all works fine.

yes, the hanger on the rail is a sram universal hanger, designed to fit shimano and sram