For the FGX: Pit Shimizu 561 fronts, 565 rears. I did a lot of testing last winter with my two. If you do get the FGX, wait and get the new Exotek conversion with IFS to go with it. Both of mine are McKune conversions, but Troy stopped making them almost as fast as he started. As far as time comparison on a small track, 12th scale was running around 7 seconds for 17.5. WGT was 7.4 for 13.5. TC 17.5 was around 7.6. 21.5 F1 was 8.3. TA was right around 9.5 running 25.5. I probably can't race Sunday, but will bring them by for a demo between rounds.