Ive been running 26 inch MT SR sportsman front runners for 6 years now on my 06 GT and want to swap to a 27 or 28. I am way TOO low to the ground. Driveways and speedbumps are a nightmare. I know the taller tire will slow my RT by .01 or so and that is fine. I know 27 inch fits but dont really know if 28s will as im lowered a half inch on FR P springs. I run Weld RTS wheels in 15s.