GV70 Wheel Sizes and Off Sets

[John Baxter]

I've seen a few posts from people looking for wheel sizes and offsets...

Here's the info direct from the Aust Gov Vehicle Registration Specification website.

Hope it helps.

 

[Etex]

I've seen a few posts from people looking for wheel sizes and offsets...

Here's the info direct from the Aust Gov Vehicle Registration Specification website.

Hope it helps.

View attachment 38433

Good find, it even has wheel well & shock travel info. Hopefully these graphics are correct:

 

[TBickell]

I'd read the manual about what any change to the factory set up will affect the eLSD function.

 

[AlexHZ]

What size 22’s would you guys go with. I’d like the widest rears possible. The macan has 295’s in the back. That would be a sweet look.

 

[Defiant888]

I've seen a few posts from people looking for wheel sizes and offsets...

Here's the info direct from the Aust Gov Vehicle Registration Specification website.

Hope it helps.

View attachment 38433

Nice. I just got my wheels put on. I didn't know what the exact offset was, so I just went with eye test. My wheels are +35mm offset, so I was within 3 mm's of the stock wheels. Now I'm wondering if I can get 255/55r19's on them when my current tire tread wears down. My wheels are 8.5"vs the 8" stock wheels. I know the 21" stock tires are 255, but they went down to 40 instead of 45s in height. At the very least, I will probably move up to 245/55r19's when that time comes. Hopefully there will much more source info out by that time.

 

[Etex]

Normally when comparing a wider rim/tire combo at the same offset the additional width would be evenly split between inside and outside. 235w vs 255w = +10mm in each direction. But that's not what Genesis did here for the stock tire sizes. Increasing the offset on the wider tire/rim causes more of the additional width towards the outside. Kinda raises the question as to whether it is an inside clearance/interference issue or tweaking the scrub radius for handling since this is usually found on the sports package. We still need that elusive scrub radius info.

(Somebody check my math, could be overlooking something).

 

[stsk]

I look forward to hearing more info about offsets as it develops.

One thing which must remain stable regardless of the diameter of the wheels you put on your GV70 is the rolling circumference of the tire/wheel combination. This is why the factory smaller wheels have numerically larger aspect ratios and bigger diameter wheels have lower aspect ratios - they want the number of revolutions per mile to be roughly equivalent across wheel diameters and tire widths. The aspect ratio is a measure of the relationship of sidewall height and cross-section width (which is usually indicative of tread width). So, 235/55/19 ends up with a circumference of 91.6 inches and 692 revolutions per mile. 255/40/21 ends up with a circumference of 91.2, for 695 revolutions per mile. With any vehicle you never want to use different rolling circumferences across an axle for any extended length of time because it'll accelerate wear on differentials, and with modern cars will drive the sensors nuts. With a highly computerized all wheel drive vehicle like the GV70 it's important to try to keep rolling circumferences as close to identical for all 4 wheels, as possible. This doesn't mean you can't put wider tires on the back if it floats your boat (although it may mess up your handling.), but it's VERY IMPORTANT that the fronts and rears have nearly identical rolling circumference.

Here's a calculator to help figure out what will work:

Tire Size Calculator

The best tire size calculator. Use our tire size calculator to find tire size specs and suggested tire sizes. Then check prices for all available tire sizes.

tiresize.com

 

[Defiant888]

Normally when comparing a wider rim/tire combo at the same offset the additional width would be evenly split between inside and outside. 235w vs 255w = +10mm in each direction. But that's not what Genesis did here for the stock tire sizes. Increasing the offset on the wider tire/rim causes more of the additional width towards the outside. Kinda raises the question as to whether it is an inside clearance/interference issue or tweaking the scrub radius for handling since this is usually found on the sports package. We still need that elusive scrub radius info.

(Somebody check my math, could be overlooking something).

View attachment 38460

That is very helpful information! I also noticed that the total diameter of the 21" wheels setup was 5mm shorter than the 18" and 19" setup. I assumed that it was to give room for clearance on the inside of the wheelbase housing during turns. With my new wheels being .5 inches wider than the oem wheels, it leaves a little bit of open space on the wheel base. I'll probably end up going with 245/55r19 tires all around as I don't want to have a staggered setup so I can rotate the tires, and don't feel like explaining to the service manager why I don't want my free tire rotation just in case it effects my free maintenance warranty somehow. I also don't want to lower my total diameter by 5mm either as I prefer the fuller look and the extra tire cushion.

 

[stsk]

That is very helpful information! I also noticed that the total diameter of the 21" wheels setup was 5mm shorter than the 18" and 19" setup. I assumed that it was to give room for clearance on the inside of the wheelbase housing during turns. With my new wheels being .5 inches wider than the oem wheels, it leaves a little bit of open space on the wheel base. I'll probably end up going with 245/55r19 tires all around as I don't want to have a staggered setup so I can rotate the tires, and don't feel like explaining to the service manager why I don't want my free tire rotation just in case it effects my free maintenance warranty somehow. I also don't want to lower my total diameter by 5mm either as I prefer the fuller look and the extra tire cushion.

I'm not entirely sure I follow you here, but there are a few things which might impact your assumptions.
1. If your wheels are a half inch wider than original, that will REDUCE the overall tire diameter slightly because it'll increase the section width of the tire and, as a consequence, decrease the section height. It's not a huge difference, but it's probably at least 5mm.
2. I don't know where the 5mm number came from, but that's about 5/64th of an inch. If you can see that difference you have better eyes than me. It's within ordinary variation in different tire brands and models and inflation pressures.
3. Here are the OEM tire/wheel combos (all diameters calculated, not measured):
255/40/21 - diameter 29 inches
235/55/19 - diameter 29.2 inches
235/60/18 - diameter 29.1 inches

Your combo: 245/55/19 - 29.6 inches (this doesn't account for your 1/2 inch wider rims). BTW, your wheels look great!

 

[Etex]

I've seen Section Width defined as sidewall to sidewall, inside one sidewall to the outside of the opposite sidewall ( mounted on nominal rim width w correct pressure), etc. Measuring tread only will usually come up short. Doing the long math w 25.4mm per inch could net different different results than the Manufacturers published specs.(Michelin Math, lol). Long math nets 3.7mm diff, but Michelin shows 5mm.

Interesting trivia is the published revs per mile, obviously they must be taking into account tire patch squish, but its more fun to assume they are allowing for a dozen or more tire spins per mile.

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[stsk]

Normally when comparing a wider rim/tire combo at the same offset the additional width would be evenly split between inside and outside. 235w vs 255w = +10mm in each direction. But that's not what Genesis did here for the stock tire sizes. Increasing the offset on the wider tire/rim causes more of the additional width towards the outside. Kinda raises the question as to whether it is an inside clearance/interference issue or tweaking the scrub radius for handling since this is usually found on the sports package. We still need that elusive scrub radius info.

(Somebody check my math, could be overlooking something).

View attachment 38460

Also, we don't know which wheel was the prototype for the suspension setup. My assumption is the 21", rather than the 18 or 19. It's possible the suspension is optimized for the larger wheel, and the smaller ones are pushed out for appearance and track purposes and to minimize the downsides of the smaller wheels. Different assumptions than trying to minimize the downsides of the 21s.

 

[stsk]

I've seen Section Width defined as sidewall to sidewall, inside one sidewall to the outside of the opposite sidewall ( mounted on nominal rim width w correct pressure), etc. Measuring tread only will usually come up short. Doing the long math w 25.4mm per inch could net different different results than the Manufacturers published specs.(Michelin Math, lol). Long math nets 3.7mm diff, but Michelin shows 5mm.

Interesting trivia is the published revs per mile, obviously they must be taking into account tire patch squish, but its more fun to assume they are allowing for a dozen or more tire spins per mile.

View attachment 38474

View attachment 38475

You're correct about the definition of section width, which is why I said "indicative of tread width", rather than "the same as" tread width, but I could have worded it better. It's a bigger difference with bias ply than radial tires, but I'm not writing an article about tire construction. In terms of the Michelin Table values vs calculated, there are any number of assumptions which could account for the differences - inflation pressure, temperature, squish, but I like your wheelspin idea. In any case, the calculator will be close, but never the exact same as, real world data. I kind of doubt Michelin's table is completely measured, rather than calculated, data also. Please keep us posted with anything further you find out about offsets.

 

[kulakents]

Does anyone know where I can find these rims? 2022 Genesis G70 Revealed With Fresh Styling
Thank you!

 

[1stGenGV70]

View attachment 38459
Nice. I just got my wheels put on. I didn't know what the exact offset was, so I just went with eye test. My wheels are +35mm offset, so I was within 3 mm's of the stock wheels. Now I'm wondering if I can get 255/55r19's on them when my current tire tread wears down. My wheels are 8.5"vs the 8" stock wheels. I know the 21" stock tires are 255, but they went down to 40 instead of 45s in height. At the very least, I will probably move up to 245/55r19's when that time comes. Hopefully there will much more source info out by that time.

I'm thinking of getting Niche wheels also. Are these the specs of your wheels? 19X8.50 Bolt pattern: 5X114.3 Bore: 72.56 Offset: 35mm BSM: 6.130

 

[Standaman]

What is the highest/positive ET that the GV can take? I'm looking at an ET 55 but want to make sure if it will fit. Thanks.

 

[NeutronQuasar]

What is the highest/positive ET that the GV can take? I'm looking at an ET 55 but want to make sure if it will fit. Thanks.

I didn't even think wheel offsets went that high. What is the width of the wheel you're looking at?

I'm just guessing but I think you would run into clearance issues with an offset that high. Especially inner wheel well and front caliper clearance. The stock 19's have an ET of 39 while the 21's have an ET of 43 because they are wider.

 

[Standaman]

I didn't even think wheel offsets went that high. What is the width of the wheel you're looking at?

I'm just guessing but I think you would run into clearance issues with an offset that high. Especially inner wheel well and front caliper clearance. The stock 19's have an ET of 39 while the 21's have an ET of 43 because they are wider.

Thanks for replying. 8.5 width. Im not a wheel expert but 55 seemed pretty high to me considering the 21s had a ET43 like you said. I'll probably pass on it as I don't want to purchase paper weights.

 

[Ashleybrooke90]

Question! I have a gv70 2.5T select coming in next week and I don’t love the standard wheels on those. How would one go about selling the factory wheels? Or can you trade in wheels at some of the wheel shops?

 

[NeutronQuasar]

Question! I have a gv70 2.5T select coming in next week and I don’t love the standard wheels on those. How would one go about selling the factory wheels? Or can you trade in wheels at some of the wheel shops?

Usually selling them on the forums with lots of active users work for the more popular brands like Audi, Porsche, BMW, etc. I would still post them on here but also try Facebook marketplace, Craigslist, Ebay, etc. Not sure if shops take in wheels especially from a relatively niche brand like Genesis.

 

[fjfarkas]

Does anyone know where I can find these rims? 2022 Genesis G70 Revealed With Fresh Styling
Thank you!

I like those too, but they're on a G70, not GV70. Unsure if there are differences in the dimensions due to the different models.