Tire size affect speedomater much
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Junior Member
Joined: Dec 2003
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Tire size affect speedomater much
Just got a new f-150 with 18 rins on with tall tires i was told. the tire it self is not a full size and is like a 17 rim with normal 17 wheels. was wondering how much of a different to the speedomater it would be if i put normal 18 tires on the 18 rims.
Senior Member
Joined: Sep 2000
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From: Mpls, MN
Senior Member
Joined: Oct 2002
Posts: 5,358
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From: Commerce Twp, MI
There is a mathematical formula for calculating the tire diameter, which is multiplied by the circumfrence which is what proportionally affects your speedo and odo.
Check out this Tirerack page for some more info.
Check out this Tirerack page for some more info.
Senior Member
Joined: Nov 2002
Posts: 156
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From: SE Wisconsin
What's normal?All you want to know is how much different the new overall tire diameter is from the stock tire diameter programmed into the computer. Use the tire size calculator. Keep it simple.