Does anyone know of a source for a 21 or 22 tooth primary sprocket? I have a heavy duty countershaft. I have not been able to find a source - it seems they stop making them at 20 tooth. I am using my Hayabusa engine to build a completely custom race bike, and it would make fitting the engine better if I had a 21 or 22 tooth so I could use a larger rear sprocket.
Thanks
Don