.21 will give you crazy power and a 28 will give you pretty much uncontrollable power . and you will need every up grade you can get your hands on .
I find that a SH .18 works well for me and I did a full RRP tranny ,
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Thanks new to the hobby so dont know a whole lot just yet got the rc10 and a thunder quake for a hundred bucks i know they stopped making the truck but its in like new condition is it worth anything