So this weekend we did some roll racing at the track and it’s a 1/4 mile roll race. This will give you a idea of how weight effects your mph at the track. Test bike was a stretched Gen 4 zx10r with quick shifter, slip on, filter, and ecu flash. We had a 140, 190, 240 pound rider ride the bike. All 30 mph rolls and we found out every 50 pounds added we lost about 3 mph in the quarter. Bike was being hot lapped so the runs were done in same conditions. Bike weighs 425 pounds wet and ready to ride.