According to the info I have read the TU 250 is maxed out at 76 MPH, so it will not be a good choice if you need to average 80 MPH. I haven't tried for max speed on mine, expecailly if I tucked to reduce my aero drag. Mine also has 1 more tooth in the front sprocket. My best guess with the TU 250X would be that you would need some aero to get to that speed, without any grades to deal with. With some gearing and aero work you could probably get to 90 MPH on level ground. Drafting on my Kawasaki 125 Eliminator, I have seen 70 MPH, so I would think the TU would do significantly better than that but for sustained 75-80 MPH I doubt the Suzuki would be a good choice. Even the CBR 250R would be fairly hard pressed at 80 MPH sustained for considerable distances expecially with any grades.
regards
Mech
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