DogT said:
Actually, I've got a 19 tooth counter tooth sprocket, which puts my total gear ratio at 4.84. That's kind of what I'm talking about, I don't need the taller ratio at all. On these back roads, I don't need the tall ratio, 50mph in 3rd gear is getting close to lugging. Since I don't have 3 teeth left, I'm not sure the Maney drive could get me there or can the primary ratios be adjusted to what I want?
Has anyone anything good or not to say about the Norvil belt kit which he will supply in nearly any ratio you want? Not that I wouldn't try to figure the Maney kit if I could make it work in my ratio. It sure looks good and has good reputation.
Just looking for information.
Dave
69S
Dave, it sounds like for the work you do you should be going down to at least an 18 tooth gearbox sprocket, even with your current primary ratio! Have you tried that? the sprocket from any AMC application will fit if it is not in the lists of Commando suppliers. Certainly the sprocket specialists should be able to help....and if you fit another primary set up the 17 might be needed if you end up with a ratio lower than 2:1
Do remember that I don't think changing the sprocket is a lot of work, but with the primary cases and alternator etc. you may think it is.
Or do you need to keep a higher ratio for occasional highway work? if so, live in 3rd
As for changing the ratio of a belt drive, drum size is fairly limited due to clutch plate size.....68, 70 and 72 seems to be it for Commandos. So its change the pulley...I think Maney only does one, but ask him. For your needs, which seems to be changing the front pulley for a smaller one, typical limitations are that for a road bike go to small and you will have clearance problems with the alternator rotor, for others, go too large and you will have clearance problems with the alternator support posts.....not a problem for a lot of racers, Norvils range are unlikely to have clearance problems in teh correct application!
Different suppliers use different belts and tooth profiles, but front pulleys can be had from around 30 teeth to 40 teeth, most seem to be 32 to 38. Different suppliers have different solutions for the keeper plate, some seem better than others, but very few seem to shed or shred belts....
I have a picture of a very shredded belt on an RGM setup, but very hard use and other set up problems were at the root of that....