lockups aren't a problem (310lb rider) stopping distance doesn't suffer that bad but i guess the 98" thunder manufacturing big bore kit and barnett super clutch and spring are to blame for any decrease , on a side note it is fun to see sportbikers jaws drop on a good hot day when the tire is real sticky and doesn't just smoke when the clutch is dumped it'll wheelie!!!!!!!Also a 170/60/16 rear tire really helps with braking and acceleration , all you have to do is lace the vulcan hub to an american wire 5"wide hoop then notch the shaft housing and weld plate over the notch also gusseted top and bottom of swingarm for stability this mod also worked to put a car tire on the rear of my buddies bike and laced the rear hoop to the front hub and now he runs a 150 up front , he wanted that exile choppers look.