Mouse...
I called QPD a couple weeks ago and they told me that the belt system for our bikes coould be suplied with a 24 or 25 tooth front pulley and a 59 tooth rear pulley. They told me that because of the center to center distance of the two pulleys that these were the only configurations that will work. The 25/59 combo gives you almost the exact ratio you would get if you have an 18 tooth sprocket on the front of the chain drive system.
