Hey All,

As we know, the Hypertech Speedo Calibrator isn't 100% accurate in the sense that you flash a 33" tire size when you install 33" tires. I'm starting this thread in hopes of consolidating what "flashed size" you used for your tire size.


Format: Hypertech = Tire Size (Tire Brand & Model)
example: 32.75" = 295/70R18 (Cooper A/T3)

 

Flashed 33" for a 35x12.50 Toy RT tire - speed verified by GPS

 

285/65/20 KO2's (34.6") with 33" plugged in to my Hypertech. It's bang on verified with hand held Garmin GPS, and I checked it and rechecked because I'm OCD.

 

Wrong Thread.

 

It's not a tune, nor is this the proper thread.

 

I was looking at the Hypertech #742501, is it worth it?

Surprised some say its not accurate

 

Wrong Thread.

 

Toyo Open County AT II Extreme LT295/60R20 Tires

Hypertech programmer set to 32.25 (speedometer is about 1/2 of a KMPH Fast)
Hypertech programmer set to 32.5 (speedometer is about 1/2 of a KMPH Slow)

Tony2

 

I am running 35x12.5x17 BFG K02's and my tire size is programmed to 33.5 and my speedometer is dead on with GPS.

 

The Hypertech calculation is going by actual measured diameter of the tire and not what the advertised size is on the side of your tire. That's why some people think it's "off".