Tire size change

[Shawn Smith]

Hello, just put 275/55/20 tires on the Adrenalin and so far so good ! no rubbing. What i would like to know is if I have to recalibrate with a SCT X3 3000 or other to adjust for larger tire ? I realize that the speedo will be off just want to know if it will damage anything if I don't do it for the time being.



Thanks

 

[swshawaii]

 

[swshawaii]

For 4WD or AWD no problem providing ALLtires are the same diameter. Here's another calculator to compare speeds for different tire sizes.

 

[Henry Suarez]

I put P275/55 20's on mine too. The Goodyear Eagle GT's grip great, however I think they are little too wide. The wheel well gap is a lot less though...

 

[Shawn Smith]

Thanks for the help ! will have to get the tuner next ???.

 

[swshawaii]

UltraGauge may be worth looking into. GL

Speed calibration for wheel, tire, and/or differential changes

 

[Brett Stoner]

You can run it with the tire size off. No noticeable difference in the past 20k of mine being 8% off.



Dealer can change it. Or you can with a tuner.



Ultragauge will not correct your speedometer. You can correct the speed on the Ultragauge so it reads accurate but it will not change the vehicle programming. Only a tuner or dealer tuning can program the vehicle.

 

[Yardsale]

If you desire to "correct" for the tire size and weight consider regearing the differential.

 

[swshawaii]

Thanks for clarifying Brett. Another option is the TruSpeed calibrator, but that's $150 you could apply to a new XCal4 that does SO much more.

 

[Shawn Smith]

Would It be better to purchase a Xcal4 then a Superchips flashpaq ?

 

[swshawaii]

Do some research. SCT products appear to be the preferred choice on Ford forums, and Torrie the MyST dealer of choice.

 

[Chris Tafoya]

Hello,

So are the fender wells bigger on the Adrenalin as opposed to the wells on regular ST's?

Because i was told to run around 255/65/R16's on mine and that is stock without a lift.

Thanks

 

[blksn8k]

I have been running BFG 265/65/18 All-Terrains on the factory wheels on my 2007 Limited since the day I drove it off the dealer's lot. They are over an inch larger in diameter than the stock Michelins. The truck has over 93k miles and I am on my second set of BFGs. I used an Xcal to recalibrate the speedo along with adding a performance tune from Torrie. No worries.

 

[Shawn Smith]

Purchased a SCT X3 from Torrie !