04 F150

Got pulled over last night by the ST in Bronte Tx at 3:30AM... Said i was going 84 in a 70 but my speedometer never left 75! My question is.... Do 24s and 305-35 tire really throw the odometer off by that much??

shadydice

That sounds about right.. Also the faster you go the more it is off by.

wrvond

Tirerack.com has a handy little tool. You can plug in your stock tire size and your current tire size and it'll tell you the percentage of error introduced by the non-stock tires. You can then apply that percentage to your indicated speed to see what you are "really" going. Of course, this doesn't account for any inherent inaccuracy in your particular speedometer.

04 F150

Ive checked and it says im actually going 2 miles slower then with stock rims and tires

mn_f150

Same here. With my stock tire size on my 2005 F150, I have been clocked at 2-3 miles below the speedometer reading. Is that common for this truck setup?

wrvond

Sounds like you should fight that ticket.

04 F150

Well what i think happend is that there was another truck infront of me that was going pretty fast maybe he got him in speed but pulled me over?