Name your wheel prims with the keyword spin
For bikes or non-turning vehicles , you do not need wheel scripts in the individual prims.
Reboot the bike after changing the prim names or any keywords.
For cars style turning front wheels, you will still need the Pivoting Sculpted Wheel scripts in the individual prims. In this case do not use the spin keyword.
Adding Burnout
Include the keyword word burn in one of your rear wheel components such as tire or rim for triggered skidding and burnout.
Wheel spin speed
There's a new variable at the top of the Settings script called Spin_Rate which is the speed multiplier for any scriptless (and scripted) v5.1 wheels. Now you can adjust the speed by editing this value. The spinning is a client-side viewer effect and may appear slightly differently on different viewers.
float Spin_Rate = 0.75;
If your wheels for some reason do not spin in the correct direction, unlink the prims, re-align them, and then link them back into the vehicle.