20" is usually stock on most Buggies , although I think the Helix are smaller . Not more than 2" larger is my rule of thumb . Larger decreases your gear ratio , higher top speed / less bottom end torque . Limited choices for 8" tires . Duro used to make a nice 20 x 8 , 22 x 8 Balloon knobby like you used to see on 3 wheelers from the 80's . I put 23" Bear Claws on my King Cobra with no noticeable lack of bottom end , but it has 10" rims .
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2011 BMS KING COBRA 150 Sold
YERF DOG SPIDERBOX's Sold
YERF DOG 3203's. Sold
MANCO SILVER FOX. Sold
2009 POLARIS 500 HO SPORTSMAN 4X4
2002 POLARIS 500 HO SPORTSMAN 4X4
2000 POLARIS MAGNUM 2X4
HALF A DOZEN CHEVY 4X4's
NEED-MO-BUGGY 
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