tire size change speedo correction calculator

Joined
Mar 17, 2006
Messages
1,656
Location
Pacifica CA
Tire size speedo correction without gps. Using the calculator so I can program the yellow box.
U.S And Metric Tire Size Information Calculator
The calculator allows you to fudge the numbers on metric tire size value input until you arrive at actual tire size as published in inches. Going from stock Michelin M+S tires (31.3") to Toyo mt (34.9") with stock gears should result in speedo correction of 11.6%. Sound about right?
 
Joined
Mar 17, 2006
Messages
1,656
Location
Pacifica CA
Use the % to calculate how many miles you really drove and then do the usual math. 315s on stock gears is approximately 10% which should be easy. But do really want to know? With the tires and other mods it will simply be worse. But you already knew that
 
Joined
Feb 25, 2009
Messages
3,575
Location
Richmond, VA
I know it already sucks
I only track it every now and then to make sure everything is good
Just wanted to make sure I had it right
Thought maybe by some chance my math was wrong and my MPG's would get better:doh:

11%+/- does sound correct from the last time I checked with a tire calculator
 

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