To my knowledge, LRP only makes a .28 and .12 line of engines. In the US 1/8 buggy and truggy most often use a .21, and LRP just recently released a .12 with rotary carb for 1/10 truck. However with the lack of popularity in 1/10 truck, until LRP releases a .21 buggy/truggy motor, they don't really have anything to suit the masses.