I have run a TC4 in my clubs VTA class as well in our Sportsman class. Both use 21.5 motors on blinky ESC. i have also run mine in 17.5 blinky, but made a change to Tamiya TRF shocks for this class. This chassis works well, but needs some simple mods to allow clearance for large pinion gears and the new rectangular lipo packs.