"Proline V2 wheels are Larger in diameter and width than previous wheels to give your car more traction and stability. The V2’s are 1.3mm wider and 3mm taller than the traditional size 1:8 wheels, which transfers into a stiffer side wall for less side wall flex enhancing stability and connectivity with your 1:8 buggy. This is achieved by using the same size 1:8 tires that you use now."
The v3 wheels rub on the front on RC8B, the v2's are wider but don't rub! I like both versions.