Thanks for that. Reason being is a 750SF sidecar outfit almost there (disabled rider).
I have a Honda 750F1 18" rear disc spoked wheel fitted. Cb650z 40T sprockets fit
straight on that, which gives standard 2.10/1 gearing. I can get a 45T 650z which will
give 2.36/1 using 530 chains. If that 1200 front spkt was for 530 chain I,d get 2.5/1
with the 40T rear which would be as far as I would,ve liked to go.