WK2 Off Road Tyres

[timbotrog]

You can increase your tyre diameter by up to 2" as well as lifting the vehicle through a suspension modification of up to 2" without an engineers report.

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prphoto

I have D697's in 265/60-18. I didn't go bigger because of the clearance from the upper front suspension.

Cheers
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[yoda42]

Originally Posted by timbotrog

You can increase your tyre diameter by up to 2" as well as lifting the vehicle through a suspension modification of up to 2" without an engineers report.

Not if the vehicle is fitted with electronic stability control, you need an engineering cert to say the ESC can operate normally with the changes or the vehicle manufacturer to say the changes are safe for use with the standard ESC

[callicom1]

I have a 2012 GC overland and are running falken wild peak 285/50 20's with no clearance issues at all.
My vehicle has quadra lift etc also.
Hope this helps you

[Kev.]

Originally Posted by yoda42

Not if the vehicle is fitted with electronic stability control, you need an engineering cert to say the ESC can operate normally with the changes or the vehicle manufacturer to say the changes are safe for use with the standard ESC

Hi Yoda,

You are correct - without an engineers report or a statement from the manufacturer you can't increase tyre size or have a suspension lift 'legally' (vehicles with ESP).

Due to this I sent an email to Jeep Australia (and USA) when I was getting my suspension done a while ago and received a reply as per below - I am aiming to have Jeep reprogram the tyre size now, but it seems as long as the suspension isn't higher than quadralift we'll be fine!

--
Hi Shona,

I have a MY2012 Jeep Grand Cherokee Laredo 3.6L V6 Petrol with standard suspension.

I am interested in performing the following modifications to the vehicle:

- Change tyres from 265/60/18 to 265/65/18. (Increase of 27mm outside diameter)
- Suspension lift of 40mm utilising new springs.

Now here comes the assistance required:
Due to the National Code of Practice here attached, section 2.6 stating any modifications must be approved by the Manufacturer or be tested to not intefere with the ESC, your assistance would be much appreciated -


I am after a specific answer to make this as easy as possible:

- Is the Electronic Stability Control provided with the optional "Quadralift" suspension any different than the Electronic Stability Control provided with the standard steel sprung suspension?

If the answer to the above is "No", then I can utilise the existing data and tests that have been completed by Jeep to perform my modifications, as the total lift I will be performing will be similar to that provided within the optional Air Suspension.

If the answer is "Yes", they are different, I need to have some further data from Jeep to say this lift and tyre upgrade doesn't affect the Electronic Stability Control.

Your urgent attention would be greatly appreciated (I have the tyres and suspension booked in this week!)

Please feel free to give me a call on xxxx xxx xxx at any time if you wish to discuss further.


Thanks,

Kevin

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Good Morning Kevin ,
Sorry for the delay in replying to your email . I have made some enquiries , below is the answer I received ,

I hope this helps .

It should not interfere with the ESP/ABS etc if the tyre size is programmed to the vehicle.

It could affect certain aspects of the vehicle's warranty where suspension or steering repairs may be required, depending on the circumstances.

once again Apologies for the late reply.
Kind regards
________________________________________


Tracey Perkins
Customer Relations Assistant
Fiat Chrysler Group

437 Plummer St
Port Melbourne, VIC 3207
Ph 1300 133 079
Fax. +61 3 8698 0250
Tp409@chrysler.com

[yoda42]

Hi Kev, I have the same size tires and the Murchison products lift, would you be willing to pm me a copy of your email and the response as that would really help me out with my local vehicle authority
Cheers Paul

[Kev.]

Originally Posted by yoda42

Hi Kev, I have the same size tires and the Murchison products lift, would you be willing to pm me a copy of your email and the response as that would really help me out with my local vehicle authority
Cheers Paul

Will do - after all, it's your fault I got these tyres and lift kit!

Kev.