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It’s probably the alignment or dish of the wheel. Any way you can shift the hub over to make it reach? May have to fiddle with spacers and adjust the spokes so the rim is centred in the frame.
Using a spacer would be the easy option if possible but you say you tried that
Dogtemple-
Hmmm that had come to my mind but then if the dishing was radically different surely the disc caliper would have also required quite a bit of moving and it barely had any rub (used the same rotor as well.). The problem with the spacer behind the cassette was that when I tightened the thru-axle up it restricted the movement of the free hub itself.
SoYaap
Mechanical problem that’s got me stumped. Fitted a new wheelset with an 11-42 cassette I was using on the old wheelset along with a
sram Force 1 derailleur to replace a Rival 1 one and a new chain. As far as I can tell the free hub body is a regular sram/Shimano one. Problem is I can’t get the chain to stay up in the 42t cog. Tried all the usual possibilities: low/high limit screws, cable tension, b-adjustment screw and no luck. The old derailleur had no problem using the same cassette so I assume that it’s not the mech hanger that’s the problem and both derailleurs are long cage models. From what I can see with the chain off it looks the derailleur doesn’t have enough swing to line up underneath the largest cog even with the limit screw wound right out. I’m pretty certain that the cassette doesn’t need a spacer but I also tried that and no dice. Any suggestions?