as far i can tell there are only a couple options
sato( really don't like the bar outside the frame just looks sloppy)
vortex( dont mind cutting the sprocket cover ran my r1 without so looks much cleaner)
if anybody has used either of these with gp shift would love your review. thank you ryan
this how i thought for longest time more rubber on the ground the better the wear. this is wrong for best millage put highest recommend psi. because when you run less air you have more rubber on the ground getting more heat into tires and putting wear on them faster