I cant figure out how to get those size wheels on my gt. If you could tell me I would be so appreciative!!
It was actually quite easy. Just pick up a set of Traxxas Slash 17mm hex adapters, re-tap the retaining nut to #8-32, and drill the pin hole in your axle stubs to accept the slightly larger cross pins (not 100% necessary, but advisable).
Those adapters are no longer on my car, as it now has an OFNA Ultra complete rear diff & suspension assembly, but it did in the pics in the beginning of this thread.
Handling was actually quite good, excellent stability. The downside is reduced braking power and weight; those HPI Phaltlines wheels/tires weigh .59 lbs EACH.