IMO it' about the outside diameter of the wheel. you can have 12" rims with low profile which maybe the same as 10" rims with regular tires or 10" rims with low profile tires close to the same as 8" rims with regular tires. AS said about the taller the tires the more speed, less torque and in some cases more tippy it makes the cart. IMO the best combinations would be wide tire, more grip and less tippy. IF I wanted faster cart then taller tire would eek out couple MPH at the cost of low speed torque.
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