I believe the RT6's (at least the ones Wormgod has) are 0 offset. The ST6's I would get are 20 mm offset. That would reduce the amount the the wheels stick out by 20 mm (0.8"). That should also require slightly less trimming of the front cladding. My one concern is whether or not the 108 mm center bore goes completely through the rim or not. I have read a thread here where someone purchased a set of wheels that weren't bored deep enough (not all the way through) and didn't learn this until they tried to mount them.