Was looking at my original rear tire which has 5300 miles on it and its getting worn out (and very old). Rear wheel is at motorcycle shop getting the Duro power grip installed. Motorcycle shop owner looked at me like I was crazy but said they would do it. (his son will anyway....lol). Soooo trying to decide what sprocket to put on. I'm running a 47t now but from what I've read maybe a 55t might do the trick? I want to be able to go 55mph but will be mostly sticking to low speed in the dirt. I'm also thinking I'm gonna need a different length chain? I was going to pester twbrian with all these questions since he is running the same tire but wanted input from anyone on this forum who has done this mod.