The GYTR flywheel that I got from a fellow TTer (thank you very much!!) has no marks on it to time the bike?!?!?!? So I guess I have to use the stock flywheel to time it then put the 8 oz on to ride? Or?! I'm not sure, doesn't seem to be a way around this. Oh well- I guess it is a 12 pack job instead of a 6 pack job!