I just bought fr. and rr. Shinko 712's about a week ago for my S-40 from bike bandit for $120 and change, shipped here to central PA. w/free shipping. Will be having them mounted and balanced in the next couple of days as I am starting a weeks vacation today.
They got generally positive reviews @ bikebandit.
Spent an hour yesterday installing the raptor. I was having fuel starvation problems 2 up under heavy loads(low vacuum) pulling the bigger hills around here. Also had an erratic idle. I thnk the vac. diaphram was leaking. Either way, It's easier to just eliminate the problem. It was very easy to do. Bought the raptor @ bikebandit too, for $28.