265/75R16 Speedometer calibration?

Recently I upgraded tire size from 265/70R16 stock size tires to 265/75R16 Wrangler Duratracs (about an inch taller). The guy I purchased them from bought a Hypertech In-line Speedometer Calibrator Module which he gave to me when I bought the wheels and tires from him. He never had it installed and I'm wondering if I should. Speedometer appears to be about 1 to 2 mph slow now so it seems it may help. Just wondering if others think it's necessary with this tire diameter increase. Any help would be appreciated. Thanks!

 

If you go to the Tire Size Calculator on the left side of the Home Page you’ll see that 265-75-16 tires are 3% taller than 265-70-16. At 65 MPH indicated the taller tire will going 67. Too close to worry about.

 

check it with your GPS

not gonna make didly squat diff......

1-2 over

UR in MT ?

SO not gonna give you a 2nd look......

 

That is what I was thinking. Thanks for the confirmation. I’ll post it up for sale

 

Interested.
Sent PM