Maxxi take offs?

65 is big rear for predator, curious what gearing does Sr clone use. ?
Think my buddy was on a 14 66 or something like that i ran at my local track worst is 3rd i been on a 16 64 but was only pushing 4700 rpm and was getting caught at end of straight aways so i wanted to add a tooth this week to get it to tach atleast 4800 i tried a couple weeks ago a 15 60 but went no where
 
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