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Early in the hype cycle, GM spoke of 37 inch tires being a simple swap with the dealer. I assume so they could recalibrate the speedometer and (maybe) raise the air suspension up a smidge. Has anyone heard or seen any reference to this option in recent communication from GM? I worry it got lost somewhere along the way and isn’t an option anymore.

I know you can probably make them fit. I am more interested in if the dealer can recalibrate. Also, I know I will lose some range with larger, heavier rolling resistance.
 

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Interesting. I can't find any reference to 37" tires anywhere on the GMC Hummer EV website. It was there just a few weeks ago. They've scrubbed it completely.

My concern now is that GMC may invalidate some portion of the suspension warranty if 37" tires are installed.
 

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Nebula1701: is that reference from the GMC Hummer website today? I've seen this reference above many times, with the superscript 4, indicating that 37" tires are possible.

I cannot find any current reference to the 37" tires on their website. It looks like they've removed all references to them.

Example (from the website today):
 

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I don't think they've ever advertised the 37" capability outside their media site. It's not something they are offering stock, you have to buy the tires yourself.

 

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I think you're misunderstanding what I'm saying: their website previously advertised that it would accommodate 37" tires. But, now they no longer have reference to 37" tires.

I think we all understand that we'd have to buy the 37" tires separate from the vehicle.

Because they previously advertised that it would accommodate 37" tires, my assumption was that they wouldn't make any changes in the vehicle warranty for those of us that installed 37" tires. Now that they've removed this reference on their website, there is more risk putting these tire on, as it might void the suspension warranty.
 

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The truck likely hasn't changed and probably can still accommodate the 37" tires. I suspect that they removed the reference to them on their website as they want to avoid warranty claims that may result from the larger/heavier tires?
It’s probably also because they didn’t achieve the states range and adding the weight would kill it even more
 

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Hey, Hummer Chat community. This is Al Oppenheiser, the HummerEV Chief Engineer. To answer your questions, the HummerEV will accommodate 37" Tires with no vehicle modifications required (meaning you won't need a mallet to 'persuade' any metal parts. We do not offer a 37" tire in the HummerEV order guide, but many/most GMC dealers should have some 37's on display in their showroom and for you to purchase after your order arrives. You can also pick an aftermarket 37" if you prefer. We do sell the cal (RPO RWQ) you can get from your dealer/service, and they will track the warranty you would get for anything going wrong related to the cal, since it is a GM release. Enjoy the 37's!
 

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Hey, Hummer Chat community. This is Al Oppenheiser, the HummerEV Chief Engineer. To answer your questions, the HummerEV will accommodate 37" Tires with no vehicle modifications required (meaning you won't need a mallet to 'persuade' any metal parts. We do not offer a 37" tire in the HummerEV order guide, but many/most GMC dealers should have some 37's on display in their showroom and for you to purchase after your order arrives. You can also pick an aftermarket 37" if you prefer. We do sell the cal (RPO RWQ) you can get from your dealer/service, and they will track the warranty you would get for anything going wrong related to the cal, since it is a GM release. Enjoy the 37's!
Well hey and thanks. Now we need some deliveries!!!!
 

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Hey, Hummer Chat community. This is Al Oppenheiser, the HummerEV Chief Engineer. To answer your questions, the HummerEV will accommodate 37" Tires with no vehicle modifications required (meaning you won't need a mallet to 'persuade' any metal parts. We do not offer a 37" tire in the HummerEV order guide, but many/most GMC dealers should have some 37's on display in their showroom and for you to purchase after your order arrives. You can also pick an aftermarket 37" if you prefer. We do sell the cal (RPO RWQ) you can get from your dealer/service, and they will track the warranty you would get for anything going wrong related to the cal, since it is a GM release. Enjoy the 37's!
Hey Al thanks for the post. Had a question about the wheels on the off-road package offered. When the Hummer EV first debueted it was showed with a nice set of 18" beadlock wheels. What ever happened to them? When I placed my order for the SUV edition 1 with the off-road package I thought those were the wheels offered, not the ones currently seen on test mules. Can you still get those, or if not can you get the 20" wheels optioned instead of the black/white 18" wheels? Thanks.
 

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Hey, Hummer Chat community. This is Al Oppenheiser, the HummerEV Chief Engineer. To answer your questions, the HummerEV will accommodate 37" Tires with no vehicle modifications required (meaning you won't need a mallet to 'persuade' any metal parts. We do not offer a 37" tire in the HummerEV order guide, but many/most GMC dealers should have some 37's on display in their showroom and for you to purchase after your order arrives. You can also pick an aftermarket 37" if you prefer. We do sell the cal (RPO RWQ) you can get from your dealer/service, and they will track the warranty you would get for anything going wrong related to the cal, since it is a GM release. Enjoy the 37's!
Thanks for sharing this Al. Correct me if I'm wrong but I though this was your account - @Aloppen?

Are you going to be using this new one from now on?
 

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Thanks for sharing this Al. Correct me if I'm wrong but I though this was your account - @Aloppen?

Are you going to be using this new one from now on?
Al will be using this new account from now on (y)
 

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I'm updating this thread, as I did some measurements of the stock wheels, and hopefully this can help anyone looking for aftermarket wheels:

18x9 wheels
8x165.1 lug spacing
Backspacing measured 6-3/16", though error in measurement could be +/- 1/16"
Wheel/tire weight combined is 99.55 lbs, which is surprisingly light for a 35/12.50/18" wheel and tire. It'll be difficult to find aftermarket replacements that are anywhere near that weight.

There isn't much clearance inward of the tire, maybe 1/2" at most.

Tire Wheel Automotive tire Motor vehicle Tread
 

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Wow @Malaligned already wrenching on the brand new truck... We can't wait to hear more about it... I would like see what wheels the person went with that has their stock wheels on Ebay... Please keep the information coming for us... If you can stay out of the driver's seat 😁
 
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