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I'm torn between the 4.56 or 4.88, where were your rpms at running 70mph?
This is a good tool to compare gear ratios and tire sizes. Gear Ratio Calculator Or you can use the actual formula RPM= mph X transmission gear ratio X axle gear ratio X 336 divided by tire height in inches.
This is a good tool to compare gear ratios and tire sizes. Gear Ratio Calculator Or you can use the actual formula RPM= mph X transmission gear ratio X axle gear ratio X 336 divided by tire height in inches.
That's correct, also keep in mind most tires don't actually measure as tall as the printed size.
True. You can did the actual diameter on the manufacturers website. If you measure one in person, you may be even more disappointed...depending on pressure, the tire will likely measure even shorter when it's bearing the vehicles weight, but the calculation remains the same as circumference is unchanged.
True. You can did the actual diameter on the manufacturers website. If you measure one in person, you may be even more disappointed...depending on pressure, the tire will likely measure even shorter when it's bearing the vehicles weight, but the calculation remains the same as circumference is unchanged.
I think you'll find that the effective circumference does reduce with the weight-bearing radius.
I put 4.56 on my 16 F-150 and it really woke it up. Actually, with my 22 inch wheels I think 4.88 would of been better. I got my 4.88 for my 6.2 F-250, cant wait to get them on. I will be running 24 inch wheels on it, 38 inch tires perhaps.
True. You can did the actual diameter on the manufacturers website. If you measure one in person, you may be even more disappointed...depending on pressure, the tire will likely measure even shorter when it's bearing the vehicles weight, but the calculation remains the same as circumference is unchanged.
The revs per mile on the tire manufacturer's site is best. Loaded radius is quite a bit smaller than unloaded radius. Spinning radius is a little larger than loaded.
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