I have been running RAZR's on my YFZ450 and Banshee for over 10 years riding MX and trails with zero flats or problems. Always wanted a RAZR2 that was smaller, lighter with wider spacing between the knobs. The 19x10x9 RAZR Ballance radial is the tire for me. The traction is so good and predictable. This really is a 19in. and is 2-3 pounds lighter than the RAZR2 20in. I can now do a sprocket and chain change to compensate for the lower gearing and increased torque.