Speedo error with 285's...
Member
Joined: Dec 2010
Posts: 31
Likes: 0
From: Salem, Or
well i put 285 70 R17's and my speedo is off... about 1mile an hour slow at 55 and about 5 mile an hour slow at 65. I just use my gps if im in doubt. anyways, I just give the old truck a chance... 
Last edited by Black '97 4x4; Mar 6, 2011 at 12:33 AM.
Junior Member
Joined: Oct 2010
Posts: 15
Likes: 0
From: Riverton, Utah
tire size and mph
I have the exact size tires/wheels on my 97 reg cab long bed and when the speedo reads 65, I am going 75! I got this info off of Discount Tires web site: tires.com They let you enter any size tires and compare them to what you were running before. Gives exact difference in mph. Very helpful. Good luck.
Junior Member
Joined: Oct 2010
Posts: 15
Likes: 0
From: Riverton, Utah
I have the exact size tires/wheels on my 97 reg cab long bed and when the speedo reads 65, I am going 75! I got this info off of Discount Tires web site: tires.com They let you enter any size tires and compare them to what you were running before. Gives exact difference in mph. Very helpful. Good luck.
P.S. when looking at tires.com, click on "info center" and then "tire calculator"