For asphalt, do you recommend running a spool or one way? This is on a low grip asphalt parking lot. The car came with a one way. If I do change out to a spool do I need to purchase just a spool or are there other parts needed? I believe I read that the one way has a center one way and I'm not sure if a spool runs with a center one way as well.

Any suggestion on a starting point for a 64 P spur gear for a 17.5?