Hey all I've got a 1991 Honda CB250FM (MC23) and it's time to change the sprockets and chain. Currently it is running 14 teeth on the front and 42 on the rear. The problem I'm having is that at 100km/h it is revving at 9,000rpm in 6th gear. It has a 16,000rpm red-line but I'd prefer to to gear it down so that it is pulling less revs at open road speeds. I don't mind scarifying some acceleration performance to achieve this. I also have no idea what the standard sprocket sizes are. I have found a couple of options that will fit and they are: Front - 14 or 15 teeth Rear - 40, 42 or 44 teeth It is also running a 140/70-17 rear tyre (I've added this as it seems to matter with the online gearing charts I've had a go with). What do you guys think I should run with?