if your getting a new chain might aswell pay an extra £7.45 for the 12mm sprocket nut
- just doing my chain and guess what it was the original 9mm job and the threads were nearly gone - in fact they were when i tightened it up to hold in place while i move shit around
- you might already have the new one on but mine has 90k on the clock and still the original nut so its previous owners have been lucky