I just installed a Sprocket Specialists 14 tooth sprocket on my 650L. It definately geared it down nicely and I really like my new gearing. However, I noticed that the stock sprocket had a rubber type material around the inside edge of it and my replacement does not. Is this a problem? Also, does anyone know the quality of Sprocket Specialists products - are they good quality products? Also, does using the smaller sprocket wear the chain faster? One last thing - what is the torgue setting for the 2 bolts that hold on the sprocket? Thanks in advance for your feedback.