[Dmc1]

Folks,
I need some help or opinions/suggestions. I have a 2013 JKUS with the small 225/75/16 steel wheels and tires. I am going to install Rubi takes offs with the 255/75/17 tires. How bad is my speedo going to be off? Will this small increment in tire size change cause me to have to re-flash my computer for the shift points? If so, what do I need to buy or do?

The JKU has limited slip and 3:73 gears.

Thanks.

 

[dawhitesJKU]

for the stock rubi, go to ur dealer to have it flashed. perhaps free with your next oil change.

 

[pocono jeep]

put in your current size and your new size- this thing is amazing!

265/75-R16 vs 285/75-R16 Tire Comparison - Tire Size Calculator

 

[Sixtyplus]

From what I can tell from the same swap on my JK, you're looking at about 7-8 mph slow with the new tires at 70mph. About 5mph at 55mph. Just enough to draw attention from the law! :nonono:

 

[Dmc1]

Thanks for the information folks. Everyone should check out the tire size calculator. It is good!

put in your current size and your new size- this thing is amazing!

265/75-R16 vs 285/75-R16 Tire Comparison - Tire Size Calculator

 

[VBWrangler12]

Just upgraded and lifted my 2012 JKU. Can you recalibrate the spedo for the new tires? Wouldn't that fix the problem?

 

[dawhitesJKU]

^your gonna need some sort of instrument to do that. AEV procal does the trick.

 

[ahsumtoy]

My Jeep Dealer

My Jeep dealership said they can flash the chip up to 285's. Since I went bigger, I got a Procal.

 

[tupper]

love my procal!!!!!

 

[4DoorCrush]

I just got a faslhcal

 

[Dmc1]

Can a person whose has a flashcal or a procal do more than one Jeep or is it specific to only one once it has been used? Can a friend flash his and another?

 

[4DoorCrush]

Can a person whose has a flashcal or a procal do more than one Jeep or is it specific to only one once it has been used? Can a friend flash his and another?

Only one

 

[Dmc1]

Thanks, that is what I figured. Wonder if Discount Tire can do it when they sell you bigger tires and wheels?

 

[4DoorCrush]

Thanks, that is what I figured. Wonder if Discount Tire can do it when they sell you bigger tires and wheels?

I'm sure they can. For a price!