Picture an imaginary lever arm between the center of your wheel and the ground.
The engineers of your car have carefully calculated the torque of your engine, the gear ratios of your transmission, the gear ratios of your transfer case, and the gear ratio of your differentials in relation to vehicle weight and tire size (they care only about the radius - the "lever arm" in our example here). The engineers did all this to give you pleasing acceleration and good off-road performance with a low crawl ratio. If you would later put large tires on your vehicle and the radius/lever arm increases (in the image below twice as long as before) your moving force decreases proportional to the increase of the radius/lever arm (in this example creating only half the moving force power). This results in sluggish acceleration and a fast crawl speed plus less torque to climb obstacles. . |
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