Re: **important Questions**
I too had used the stock set up and never had a problem. Here are two tips above what had been mentioned. Your chain stay is typically not parallel to the chain. This would suggest that you need to twist the roller so it runs in line with the chain and not sideways. The other tip is to have the chain run on the bottom instead of the top side of the roller. That way if it slips it will slip to the outside of the bike and not into your spokes.