My Katana would top out at 70mph. No transmission so its just a single ratio between the front sprocket to the rear. Other specs, 430lbs, 40HP, 80mile range, ok acceleration. I will probably gear the R6 to a similar top speed. Aiming for 360lbs, 100mile range and will upgrade to 80HP+ down the road. I'll get a better pic of the R6 soon