With tall gearing that's a ton of speed. I'm not surprised you are burning tires. You'll need a harder compound to get more life out of them.
My gearing is not the stock trx4 sport gearing Im running a 13 pinion with a 45 spur. My guess would be it tops out at 4 maybe 5mph. Also I was wrong my motor is a 27 turn not a 21t.
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