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HOW TO UNDERSTAND GEAR RATIOS

PHOTOS HOPE McCALL Get more bite from your car's teeth This 90T spur gear and 20T pinion equal a 4.5:1 gear ratio. The pinion must turn 4.5 revolutions to turn the spur gear 1 revolution. Gears: every car and truck has 'em (yes, even the belt-driven ones), but not everyone understands themóor knows how to get the most out of them. Let's take a look at gear ratios, gear pitch and gearing your car or...

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