Largest Tire on Stock Suspension Z71

[Theiobot]

So im looking to get Nitto Ridge Grappler tires but wondering how tall I can go without major rubbing and even width. I have the 20' OEM rims. Can i get away with say 285x65x20? I dont mind a little rubbing or if i have to do very minor trimming. Ideally no trimming lol.

 

[olyelr]

You go through this thread yet?..

AT4 XL - Largest Tires?

I just picked up a 2021 AT4 Yukon XL. Ive got 275/60/20 stock wranglers on there but want to max it out with an all terrain and dont plan on leveling. I assume its similar to the denali threads with air suspension but I couldnt find one specific to the AT4.. any tried bigger tires on the AT4 yet?

www.tahoeyukonforum.com

I think 285/65/20’s would definitely be a tight fit stock. No doubt doable with some trimming.




This guy claims his 33x12.5 graps fit, no rub…

 

[Polo08816]

The real question is what is the largest tire that can fit in the spare tire location.

 

[Theiobot]

The real question is what is the largest tire that can fit in the spare tire location.

Im not buying 5 lol, spare will be just that, good enough to get me home.

 

[Polo08816]

Im not buying 5 lol, spare will be just that, good enough to get me home.

Will the drivetrain be able to cope or remain undamaged with a spare that has a significantly different diameter and circumference?

 

[Theiobot]

Will the drivetrain be able to cope or remain undamaged with a spare that has a significantly different diameter and circumference?

Are you implying that a stock full size spare on an OEM spare rim vs a lightly oversized tire is going to make any difference in the drivability of the truck or performance? Because last time i checked 80lbs of groceries in my trunk didnt effect a damn thing just like whats hanging off the rear undercarriage.

 

[Theiobot]

Will the drivetrain be able to cope or remain undamaged with a spare that has a significantly different diameter and circumference?

Didnt have my coffee... let me try this again. Most cars have donuts not full sized spares. The OEM spare rim is also different than my 20" black so weight difference there also. With TC off im sure limping it home will be of zero issue and do no damage to the drivetrain but I see your point. Then again I am far from a gear head so I am sure someone smarter than me can chime in.

 

[Theiobot]

You go through this thread yet?..

AT4 XL - Largest Tires?

I just picked up a 2021 AT4 Yukon XL. Ive got 275/60/20 stock wranglers on there but want to max it out with an all terrain and dont plan on leveling. I assume its similar to the denali threads with air suspension but I couldnt find one specific to the AT4.. any tried bigger tires on the AT4 yet?

www.tahoeyukonforum.com

I think 285/65/20’s would definitely be a tight fit stock. No doubt doable with some trimming.




This guy claims his 33x12.5 graps fit, no rub…

View attachment 387505

Can you link me to his thread or profile so i can ask?

 

[Polo08816]

Are you implying that a stock full size spare on an OEM spare rim vs a lightly oversized tire is going to make any difference in the drivability of the truck or performance? Because last time i checked 80lbs of groceries in my trunk didnt effect a damn thing just like whats hanging off the rear undercarriage.

Didnt have my coffee... let me try this again. Most cars have donuts not full sized spares. The OEM spare rim is also different than my 20" black so weight difference there also. With TC off im sure limping it home will be of zero issue and do no damage to the drivetrain but I see your point. Then again I am far from a gear head so I am sure someone smarter than me can chime in.

I think there are quite a few spare tire configurations:
1. No spare tire at all.
2. "Skinnier" spare tire - same overall diameter as regular factory tire/wheel but different width (different capacities, speed limits, etc.)
3. Full size spare


Different size left/right tire on rear axle:

I think if you were in 2HI and had a completely open rear differential, there isn't too much to worry about. At most, traction control would engage earlier due to the innate difference in rotational speeds. Other than slightly increased rear brake pad wear, I don't really see an issue.

I'd be interested in seeing how a truck with the eLSD would handle this situation and if there's any significant wear for the clutches in that LSD.


Now keep in mind that OEMs develop these LSDs, AWD/4WD drive trains to tolerate some differences in diameter. For example, I don't think a worn tire vs a new tire of the same factory size is going to damage the system - I would imagine the system can tolerate these very minor differences in diameters.

I think it could be an issue if you have tires that are significantly different in diameters (and this rolling circumference). What exactly threshold is - I don't know.

 

[olyelr]

Are you implying that a stock full size spare on an OEM spare rim vs a lightly oversized tire is going to make any difference in the drivability of the truck or performance? Because last time i checked 80lbs of groceries in my trunk didnt effect a damn thing just like whats hanging off the rear undercarriage.

Driving on one tire that is a lot shorter (or taller) can reek havoc on a drivetrain. Not necessarily sure that is the case here, though.

 

[Polo08816]

Driving on one tire that is a lot shorter (or taller) can reek havoc on a drivetrain. Not necessarily sure that is the case here, though.

https://www.tirerack.com/tires/tires.jsp?tireMake=BFGoodrich&tireModel=All-Terrain+T%2FA+KO2&frontTire=76SR0KO2&rearTire=865SR0KO2V2&vehicleSearch=false&fromCompare1=yes

About a 1.6" difference in diameter. For revs per mile, the larger 285/65/20 tire, there is going to be about a 4.5% difference in rotational speed.

I just don't know what the threshold is for the stability control system.

 

[LeeMc]

So im looking to get Nitto Ridge Grappler tires but wondering how tall I can go without major rubbing and even width. I have the 20' OEM rims. Can i get away with say 285x65x20? I dont mind a little rubbing or if i have to do very minor trimming. Ideally no trimming lol.

Unfortunately, the stock Z71 tires are as large as you can go without and rubbing on stock rims. The challenge with the rubbing is that there is a metal bracket behind the wheel well liner that would need to be cut out to provide more space.

 

[olyelr]

Unfortunately, the stock Z71 tires are as large as you can go without and rubbing on stock rims. The challenge with the rubbing is that there is a metal bracket behind the wheel well liner that would need to be cut out to provide more space.

You sure? What about the guy that posted he runs 33x12.5’s with no rub?

 

[CASTLEDFW15]

I get each their own imagination but someone please help me…..not this specific case but a general question……. This scenario willl be part of the question but also others.


Why would someone pay $60,70,80,90K for a luxury themed SUV and the first question is……..What size tires will fit in the wheel well without having to trim the fender well? Why should that even be a thou for this price range of vehicle?

I could get previous generations where probably a cash car or daily driver but seriously a MY 2021-2023.

Again not a specific pro/con but a general questio.

 

[olyelr]

I get each their own imagination but someone please help me…..not this specific case but a general question……. This scenario willl be part of the question but also others.


Why would someone pay $60,70,80,90K for a luxury themed SUV and the first question is……..What size tires will fit in the wheel well without having to trim the fender well? Why should that even be a thou for this price range of vehicle?

I could get previous generations where probably a cash car or daily driver but seriously a MY 2021-2023.

Again not a specific pro/con but a general questio.

The correct answer to that is simply because thats what they want to do.

Its all about personal preference and opinion.

 

[Theiobot]

So threw on Nitto 285x65x20 onto this pig and they def rub a little bit on the inside back corner at 50-75% wheel spin. Nothing big just rubs the felt and with minor trimming wont be an issue I just left it as is. Zero issues offroad or under suspension travel but they def do not clear even in Off Road hight setting. But the truck looks like an off road vehicle now for sure.

 

[Kpwweb]

Unfortunately, the stock Z71 tires are as large as you can go without and rubbing on stock rims. The challenge with the rubbing is that there is a metal bracket behind the wheel well liner that would need to be cut out to provide more space.

You can run 285-60r20 on stock wheels with no rubbing.

 

[Polo08816]

You can run 285-60r20 on stock wheels with no rubbing.

Do you know if that will fit in the spare tire well?

 

[Toasty]

285/65 are waaay to big, nothing to do with clearance. ABS and stability/traction control are not going to operate as designed with a 1.5+" bigger diameter. standard deviation max is typically half inch. You'll likely not discover this problem until you need ABS or traction control, and by then it could be too late. Good luck getting your insurance to not drop you and refuse coverage if they discover you've caused your safety systems to malfunction in a crash.

 

[jgraves]

I get each their own imagination but someone please help me…..not this specific case but a general question……. This scenario willl be part of the question but also others.


Why would someone pay $60,70,80,90K for a luxury themed SUV and the first question is……..What size tires will fit in the wheel well without having to trim the fender well? Why should that even be a thou for this price range of vehicle?

I could get previous generations where probably a cash car or daily driver but seriously a MY 2021-2023.

Again not a specific pro/con but a general questio.

It's about getting the vehicle you want and enjoying the modifications / personalization for the full duration of ownership. Every time I've added a modification to one of my vehicles after several years of ownership, my first though is "why didn't I do this upon delivery". I ordered my truck, tractor, motorcycle and cargo trailer from the manufacturer and all had permanent modifications (holes drilled, wiring altered, welding, etc) within the first couple months of ownership. As delivered is just a starting point to create what the manufacturer won't offer. Planning modifications was part of deciding which factory options to order on my Yukon.

Jeff