Quote Originally Posted by mudski View Post
Yeah of course they do. Sorry. I forgot about that. Not sure what rims you have, but I have aftermarket alloys using 19mm hex nuts and the rear carrier nuts still fit in mine fine. Its close, but the socket still gets in...
Yeh - so the wheels on the hubs we swapped to a 19mm hex head nut into the hub studs - plenty of clearance.

But as you said, the the ones into the spare carrier are still a 21 hex head. I ended up getting a socket designed for tapware, so a plumbers bit of kit which is much narrower and thin - worked really well for two of them which are very tight now - but the third was still a challenge as it seems like the head of the stud was a little offset in the hole of the wheel.