I have an 8.5t and I use 25/87 on carpet to move the motor forward. On astro and grass when it is wet or damp I use 23/81, the gearing is similar to 25/87 and it moves the motor further back for a bit more grip.
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Durango, Novarossi, Losi, Sanwa, Savox, AKA, Optifuel, Tamiya, Kyosho and lots of mods
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