I just discovered that the default setting for the wheel size on the TrailTech computer is wrong for the Predator standard front wheel. I finally measured and calculated like the instructions state from TrailTech and the standard is off by a lot. The standard setting is 2155. If you use the B method to figure out you measure the wheel height, which on the predator is acutally 20 inches. It's really like 19 and 7/8ths. But 20 is close enough for me. The tire states 21 inches but that must be at full tire pressure or something. from the ground to top of mine is 20inches. Then you convert that number to MM, I used http://www.sciencemadesimple.com/conversions.html web site to convert from Inches to Millemeters. Then take that number times PI or 3.14. The resulting number is what you need to set the WS parameter on the TrailTech Computer. The number I got was 1595. I can't wait to go riding now with the right number to see the differences. I think the speeds will be faster due to the faster rotation times for a smaller number. I'm also kind of mad at TrailTech for not setting the thing from the factory for the Quad or bike you purchase it for. I just assumed it was correct. And was wrong.