Thanks, I have the hexes for the rear. The buggy came with 6 sets of pin style rear tires so I may hold off until they wear out. Do you run the hexes on the fronts like the SC10 (with the conversion), or is it just for the rear. Is there a certain offset for the wheels or are all buggies the same? The SC10 front springs work on the B4 rear correct? What are the part numbers to convert to the Losi or Kyosho springs?