I know this question has been answered before but I couldn't find it. If I upgrade my tires from stock 255/70/16 to 265/75/16 how much will my speedo be off.thanks

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2001 Supercrew(1), XLT 4x4,5.4l,tow,3.55ls, captains chairs
Island Blue & Silver Frost.6 disc changer,keyless entry,bug shield,vent visors,expy console,duraliner bed liner,extang tonneau cover, more to come

 

Here's what I made for my truck:
Original Tires-------------New Tires
255/70/16 (30.1" Diameter) 265/75/16 (31.6" Diameter)

Speedometer Reading---------Actual Speed
10------------------------------10.5
15------------------------------15.7
20------------------------------21.0
25------------------------------26.2
30------------------------------31.5
35------------------------------36.7
40------------------------------42.0
45------------------------------47.2
50------------------------------52.5
55------------------------------57.7
60------------------------------63.0
65------------------------------68.2
70------------------------------73.5
75------------------------------78.7
80------------------------------84.0
85------------------------------89.2
90------------------------------94.5
95------------------------------99.7
100----------------------------105.0


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'97 F-150 Lariat SuperCab 4X4

• White/Silver, 4.6L, Auto., Open 3:55
• 265/75/16 BFGoodrich AT's on polished 16x8 AR-136's
• Cat-back Dual Exhaust (Straight pipes with big chrome tips)
• Black Polar Bear Grille Guard
• Stock '01 AM/FM/CD stereo
• Edelbrock Performer IAS Shock at Each Corner

[This message has been edited by Flatlander (edited 04-06-2001).]

 

Flatlander, thanks for the great info.I don't think I will worry about recalibration with those numbers. thanks again