Rear derailleur at limit, chain still rubbing

If aligning the hanger doesn't work, it's not a tweaked derailleur, the guide pulley isn't slopped out, and it behaves the same with zero cable tension, the fix is then to put a spacer under the RD mounting bolt. In shops this would be a 1mm M10 axle spacer, but you can improvise with whatever.

It's unusual to need to do this on aluminum bikes, so I kind of suspect it's something else, but in a pinch the spacer may be a solution of sorts anyway.

Thanks for all your help, but there just can't be a solution to it when I am an idiot ;)

Somehow when setting the cable, the pinch bolt probably wasn't open fully, so I thought I was at the limit and when tightening, I must have pulled too hard on the cable so the derailleur was pulled in 1 or 2mm inwards without me noticing.

So I...

• unclamped the cable completely
• made it hand-tight
• clamped it
• put tension on it with the barrel adjuster until it started to move slightly

I am now able to reach the H limit. Well, lesson learned. At least I can install a derailleur now ;)

Thanks for all your suggestions!

Maybe there is an axle spacer missing on the drive side. Or maybe you need to move one spacer frome the non-drive side over to the drive side. Check if the wheel is centered in the frame.