I bought the Primary Drive 13t sprocket from Rocky Mountain and went to replace the stock last weekend. I didn't put the 13t on because it didn't seem right without a spacer.Is that little amount of space between the chain and the lower end right? It seems really close and the stock one seemed thinker to bring the chain out more.I know everyone asked about the rubber bushing on the stock sprocket but it also looks like a spacer more then a bushing.Has anyone had the issue of the chain rubbing with the 13t?

 

DO NOT US THE SPROCKET WITHOUT THE SPACER IT WILL RUB ON THE CASE!! I went to a machine shop and for a box of donuts my buddy made me a 105 spacer, but if I can find the time to sort through all of the threads about sprockets, I'm going to replace the two piece with a solid. I don't like having to stick something in there that wasn't meant to be there.

 

I'm running the 13/42 combo till I figure what I want didn't care about chain wear there cheap anyway... My bike runs the same numbers if I'm going 65 mph its running 6500 rpms in 6 th gear 70 its running 7000 and so on