Backed out the rear caliper so that it would not touch the rotor (warped rotor test) - nope

Re-greased the axles with a Molly grease -not that either.

Must be the front tire.

'06 SM with T100/America Wheels (D&D's, 10.5 to 1 Wiseco pistons, TTP Igniter +3, K&N PODS, 150 x 40, FZ1 springs & TBS needles w/3 shims)