http://www.petitrc.com/setup/durango...210_GearChart/
Just cross reference the recommended ratio for your motor to the spur your running.
I currently race at Batley and run an 8.5 lrp x20 geared 25/81 that got me C6 at last weekends regional,
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----Cougar 2 team----Cougar 2 works----Cougar 2000---- ----Schumacher Bosscat---- ----Traxxas TRX1----Losi XXX CR----Losi XXX BK2---- ----AE B4 ft----Xfactory X6^----DEX210 V1---- ----TLR22 3.0----TLR22 4.0----TLR22t 4.0----TLR22 5.0AC---- ----AE B6.4----
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