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Want to put 235/85/16 tires on to replace 245/75/16 tires.

Tiny
STANDFIRM
  • MEMBER
  • 2004 FORD F-150
  • 141,335 MILES
I have a 2004 Ford F-150 XLT 4x4. I currently have 245/75/16 tires. I'm thinking of putting on 235/85/16 tires. Do you think there will be any problems? Will there be a problem?
Thursday, January 5th, 2012 AT 3:40 AM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Your speedometer will read about 7% slower than what you're actually going.
Total height of 245-75 tires = 245 * 75%=183.75
Total height of 235-85 tires = 235 * 85%=199.75
Taller tires have a larger circumference. Larger circumference means more distance traveled per revolution.
If you take it to a speedometer or driveline shop, they can recalibrate the speedo.
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Thursday, January 5th, 2012 AT 4:41 AM
Tiny
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Thank you for the info, very much appreciated. Have a great NEW YEAR.
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Thursday, January 5th, 2012 AT 5:16 AM
Tiny
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  • MECHANIC
  • 6,110 POSTS
My pleasure. You too.
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Thursday, January 5th, 2012 AT 5:29 AM

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