I'm about to install some larger tires on my 2010 G55 and expecting to have ESP & Speedometer calibration issues.
Does anyone know of a shop in the Baltimore/Philly corridor, preferably close to Newark/Wilmington DE, that has experience in recalibrating the G wagon for bigger tires?

Thanks,
Tim

 

Can't the dealership do it?

 

You will need a shop with a STAR system to change the tire size settings. Keep in mind that there are only a certain number a pre-programmed tire sizes available to select. Which ones will be a function of the year and software for your particular truck. For my G, tire sizes as large as 33" were not an option.

 

Thanks Floobydust.... I've seen quite a few Gs with 33s, but you raise a good point. While I've seen several G55s on larger tires, most off-road builds are G500s or G550s. My 1st challenge is finding an indy shop with the STAR system, since I read most dealers won't entertain my ask. I at least need to find out what my options are.

Can anyone recommend an indy shop in the Wilmington, DE area that has the STAR diagnostic tools

 

Did you get your Speedo Calibrated?

 

I think the answer will be "no"

 

I have known several dealers that will at least put the truck on the SDS system and tell you what the pre-programmed size options are if you are willing to pay for the shop time. There are options for both the instrument cluster/electronics and the transfer case (both must be set). Some people I have read have owned one of the Chinese bootleg STAR systems and done it themselves.
.

 

I have not put the new wheels and tires on my G yet but when I had 33's on my JK Wrangler Rubicon UL
I just used an App that told me the speed I was going (Waze does that now) and kept in mind the difference when I was driving.
It really was not a big difference.
Not sure what it will be on the G, I will be putting 295's on mine as soon as they arrive.

 

Are you getting G550 or G63? Are you gonna use spacer? I plan to put 295/55/20 on mine (2020 G63) when it gets here, but still debating between the new Toyo open country AT3 and Nitto ridge grappler

 

I went with the same size and the Ridge Grappler.
No spacers, custom wheels.