[jhautz]

With heavy tires like that you will probably be better off with the 51/16 gearing. But you can feel it in once you get it set up. 18T is not out of the question depending on the voltage you run.

If you check the store Mike now has 17T and 19T pinion gears listed. I dont know where he found them, but I'm glad he did. (Just ordered me a set the other day) Sure makes gearing alot easier 1 tooth at a time.