rotor
the rotor can handle extreme braking and is a lot stronger then clamping the spokes that can stress the wheel out of shape, clamping the spokes can soon make them loose.
the exhaust has made a massive diffrence in torque and power. i run a 32 tooth sprocket and it pulls away better then the 44 tooth on a standard engine.
i have just bought a new carb that will give me more fueling and a booster bottle.
when i fit them i will do a utube video on the gps and see how quick it goes.