I love my 10/mm GOBS of torque. If you deside to go 10/mm start thinking about the tranny. Have the gears cyro treated. And install outer support bearing to the output shaft. I made the whole season on a stock tranny. The next time I split the cases I will have this done on mine. If your pushing sand around with paddle tires you probably with in time blow the tranny. The razer tires that I've got on my bike with a 10/mm suck for traction, but mite of saved my tranny this year. Keep this in mind if you deside to go 10 mill IT'S JUST CHEAP INSURANCE. The builder that builds your motor will help you out on this. good luck