I usually run the .21 race tuned in my Losi truggy,

I like it, but alot of guys seem to prefer a bigger motor (.24-.28) around where I run. I like having the runtime vs. extra power. Then again that will all depend on your area, track size, clutch setup, and pipe choice. All play a part in the overall performance of the motor in a truggy.

My best runtime on a small track was about 15:30 with the tank bone dry, using a big boy pipe. On the largest track that I run on, the run time with the same pipe was 8:00-9:30. I was a little under geared for the track and was running harder.

The .24 is nice in a truggy and either would do well.