Quote Originally Posted by nigzcurran
I think it's an 86mm? Think 32 is for the 6 pots although I'm usually wrong on these things!
On the 540 it is a bit too small, probably need 34-38
The 3 series I am pretty sure it is 32.
You don't need the big one 86, that goes all around.
Feel free to drop by to try the 32