This may not fit in with the topic too much but, I've used the scotts on the dirt bike for about 8 years and would never ride without one again. Probb. makes more of a diff. off road but I'am going to try the 90w mod on the stock one first.When the front end gets light when it comes down they shake a little sometimes, anything would help. The scotts has low and high speed adj. and a sweep adj.Not too sure about the gpr.