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I'm rebuilding an old 10T with my boys(4 and 6). I want to go brushless with it and was wondering if a 21.5 turn would have too little power. They're both already driving RCs. They run a 17.5 now without problem in a buggy. I just came across a good deal on a 21.5 and thought it might be ok. Any thoughts?

21.5 is around RS-540 speed. I thought it was a good fit for my 4 year old. One thing I noticed (at least for my kids) is that if you reduce power, they don't seem to notice and have just as much fun and you won't have to fix the car as often.