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I wish someone said to me 13.5 rather than 6.5 in my 2wd as a beginner. You'll just spend longer on your roof and replacing parts with silly motors.
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I agree with this totally.
Indoors it's more about driveability not out and out speed.
I use a 6.5 in my 4wd, and a 7.5-8.5 in my 2wd depending on track and conditions
My sons use 10.5 in the 4wd and 13.5 in their 2wd's, with the right gearing the 13.5 is very good and plenty fast enough down the straights and has good jump launch speed