Tire size and RPM reduction
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Joined: Sep 2005
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From: Smithers, BC
Tire size and RPM reduction
I would like to get lower RPM at highway speeds. I am looking at changing tire sizes from the stock 225/70R16 to 235/85R16. In looking at the Michelin site (for example sizes only) the 225/70 are 738 revolutions per mile and the 235/85 are 655 revolutions per mile. This translates to approximately 11% reduction in revolutions per mile.
Now here is where I can't figure the logic of the problem. If my engine is turning 2100 RPM at 110KM per hour, can I expect an 11% reduction in RPM with the larger tires? Something in me says that there is no direct correlation here. What say you. Can the RPM drop be calculated?
Now here is where I can't figure the logic of the problem. If my engine is turning 2100 RPM at 110KM per hour, can I expect an 11% reduction in RPM with the larger tires? Something in me says that there is no direct correlation here. What say you. Can the RPM drop be calculated?
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Joined: Jun 2005
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From: Southern IL
http://www.4lo.com/calc/geartable.htm
this chart will show you an approximate change in rpm when changing geae/tires etc
this chart will show you an approximate change in rpm when changing geae/tires etc
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Joined: Dec 2003
Posts: 595
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From: College Station, TX
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