Wide Wheels and Tire Sizing G70

[jjsC6]

To each their own, but I agree with G70King that a 305 looks out of place on a G70. It depends on the specific car. For example, my C6 Z06 had 345's out back. They were perfectly at home on the car, which is a very powerful sports/super car with the fenders and stance, purpose and performance where those tires are right at home. In fact they come with 325's from the factory. However a G70 is a compact sport/Luxury sedan. Personally I think 275, possibly 285 is the max in terms of looking tasteful. Beyond that, it looks like you're trying to turn the thing into a redneck muscle car. And that's nothing against rednecks or muscle cars. In fact, I'm a red neck and have a muscle car in the garage (Mustang)...which just so happens to have 305 DR's on it. At the end of the day it's of course a matter of opinion and personal taste. That's my opinion as a 52-year old who's been a car guy since he was a kid, and has had a little bit of everything... Foreign, domestic, muscle cars, sports cars, trucks, motorcycles, etc, etc. Cheers.

I got a good laugh at this. I had a C6 Z06 also. A friend of mine just bought a C8 Z06. He owes me a favor too

 

[Volfy]

Dear Mr. Volfy,

Curious as to your input on a wheel/tire/spring setup that I am considering for my 23 G70 AWD 3.3T SP

2x ARK-AB52S 19x8.5, 5x114.3, 35mm offset, (67.1 so hub-centric), using OEM 225/40/19
2x ARK-AB52S 19x9.5, 5x114.3, 35mm offset, (67.1 so hub-centric), using OEM 255/35/19
Probably will run a 10mm spacer up front, since they don't make a more aggressive offset for their 19x8.5 wheels.

Any foreseeable problems? Not ideal for my scrub radius?

I corrected your rim widths for you.

If you are going to stay with OEM tire sizing, the 9.5" is unnecessary. It would be mostly for looks... if that's what you are wanting.

The OEM tire sizing are chosen for very specific and sound reasons. The staggered setup allows the front tires to be narrower for better support by the 8" wheels, which sharpens corner tip-in and overall handling. The narrower tires also reduces NVH, which is no less important in a small luxury sedan like the G70. The rear 255 are really for handle the stout HP/TQ of the 3.3T. This is why the 2.0T typically come equipped with 225 all around. Unless your car is modified with substantially more HP/TQ, 255 is plenty.

What's important to keep in mind is that the requirement for the rear (driven) tires are different than the front (steering) tires. For the rear, tire compliance is far more important, so as to allow the power to be put down on the tarmac. In this case, going with too wide a rim size actually will support the tire too well, lowering compliance and could possibly leading to tire hopping and loosing mechanical grip... especially on a hard launch. 8.5" is on the narrow end of recommended wheel width for 255, which is actually a good thing for the rear wheels.

If you want to mount OEM tires on aftermarket LIGHTWEIGHT wheels, I would suggest 8.5" for both front and rear. The slightly wider front wheels will support the 225 even better, which is what you want on the front axle. The rear wheel width stays the same, which is ideal.

This opens up the possibility of going square 255 all around. 255/40R18 on 18x8.5 is what we run on our G70 6MT Sport. Properly set up, the wider front wheels helps to reduce the G70's tendency for understeer on corner entry and produces a more neutral handling chassis... at the cost of slightly higher NVH and steering effort (hardly noticeable, in our experience, but is there nonetheless).

If you go with 19x8.5 ET35 all around, you shouldn't need spacers at all.

In terms of lowering, I am consider the following springs: ARK GT-S, Eibach, or H&R. Don't have any kids, so almost never anything in back seat, but I'm 275lbs and I have big friends that sit in the passenger seat, so the soft rear ARK spring has me a little concerned about that, but would prefer the softer spring for comfort at the same time...dilemma. Thoughts?

Ride quality is affected much more by the dampers(shocks). Spring rates don't affect it as much. We initially switched to Eibach lowering springs, which are some 10-15% stiffer. Ride quality remained just about the same as with stock springs.

Important note: I frankly do not understand why some of these aftermarketeers spec softer spring rates for lowering springs. When you reduce suspension travel (with lowering springs) you need to increase the spring rate proportionally to maintain the same load rating = spring rate x suspension travel. Lowering ride height with softer spring rates means your car will not be able to carry the same max live load as OEM. Your suspension could potentially bottom out, and that is not safe at all, nor good for handling.

 

[tikva98]

Gday all.. from Melbourne Australia... first time post on this forum so go easy!

Have a 2019 Genesis G70 Ultimate Sport RWD.... very rare over here. Owned the car for a year and haven't seen any G70's on the roads.
like that its unique but on the flip side hardly any aftermarket stuff available for it here or local information.

Anyway I'm looking at some particular wheels/rims which are on clearance (so can probably only return them for store credit)
Front 19 x 8.5 +35 with 225/40s
Rear 19 x 9.5 +33 with 255/35s

The tyres are just new so will probably look at going wider when they need to be replaced.

Think the fronts will be fine but unsure if there will be any fitment issues with the rears... has anyone put wheels with these configurations on theirs or advise if there could be issues?
Thanks in advance!

 

[blnewto]

Gday all.. from Melbourne Australia... first time post on this forum so go easy!

Have a 2019 Genesis G70 Ultimate Sport RWD.... very rare over here. Owned the car for a year and haven't seen any G70's on the roads.
like that its unique but on the flip side hardly any aftermarket stuff available for it here or local information.

Anyway I'm looking at some particular wheels/rims which are on clearance (so can probably only return them for store credit)
Front 19 x 8.5 +35 with 225/40s
Rear 19 x 9.5 +33 with 255/35s

The tyres are just new so will probably look at going wider when they need to be replaced.

Think the fronts will be fine but unsure if there will be any fitment issues with the rears... has anyone put wheels with these configurations on theirs or advise if there could be issues?
Thanks in advance!

Check this post from me in this thread

Post in thread 'Wide Wheels and Tire Sizing G70'

Nov 24, 2024

That's what I was afraid of with the spacer. My dilemma with this, is I am not super fond of the rear being quite aggressive (which I believe a 19x9.5 + 35 will be aggressive on this car since the stock rear setup is 19x8.5 +46.5) while leaving the front tucked in like OEM. I liked a more balanced look between the front and rear in terms of offset/flushness.

If this was my fun car and/or I didn't live in NY, I wouldn't mind a 255/285, or more likely a 245/275 setup, but this is my DD. My fun car is in the garage all winter. And since I am in NY that means I will likely have to deal...

• blnewto

• 

Your wheels in back will be 6mm further out from where mine sit, the tires will still tuck inside the fender though, so shouldn't have any issues other than that wheel be further out. Ideally an offset in the +40 range would be best there though.

 

[tikva98]

Check this post from me in this thread

Post in thread 'Wide Wheels and Tire Sizing G70'

Nov 24, 2024

That's what I was afraid of with the spacer. My dilemma with this, is I am not super fond of the rear being quite aggressive (which I believe a 19x9.5 + 35 will be aggressive on this car since the stock rear setup is 19x8.5 +46.5) while leaving the front tucked in like OEM. I liked a more balanced look between the front and rear in terms of offset/flushness.

If this was my fun car and/or I didn't live in NY, I wouldn't mind a 255/285, or more likely a 245/275 setup, but this is my DD. My fun car is in the garage all winter. And since I am in NY that means I will likely have to deal...

• blnewto

• 

Your wheels in back will be 6mm further out from where mine sit, the tires will still tuck inside the fender though, so shouldn't have any issues other than that wheel be further out. Ideally an offset in the +40 range would be best there though.

Thanks for the response! appreciate it. Is the red genesis yours?

Yeah need to stay under/flush with the fender... if its sticking out past the fender then may get pulled over by cops depending on how they are feeling at the time.
How much mm difference is between +33 and +40? Is it 7mm?

How much further out will the rear sit out compared to stock? Will They Fit site says 25mm... if +46 is the correct stock rear offset?
If I measure 25mm out from where the current wheel sits it sticks out quite a bit past the fender... (dont know if that is a true measure or indication)
I believe my car has the 8.5 inch rim on the rear.

Wheels are very expensive here (for me anyway) and these ones are on clearance for $600 for a set that is of decent quality flow forged... hard to pass up when on a budget!

 

[blnewto]

Thanks for the response! appreciate it. Is the red genesis yours?

Yeah need to stay under/flush with the fender... if its sticking out past the fender then may get pulled over by cops depending on how they are feeling at the time.
How much mm difference is between +33 and +40? Is it 7mm?

How much further out will the rear sit out compared to stock? Will They Fit site says 25mm... if +46 is the correct stock rear offset?
If I measure 25mm out from where the current wheel sits it sticks out quite a bit past the fender... (dont know if that is a true measure or indication)
I believe my car has the 8.5 inch rim on the rear.

Wheels are very expensive here (for me anyway) and these ones are on clearance for $600 for a set that is of decent quality flow forged... hard to pass up when on a budget!

Yes, the red G70 is mine, those are the stock wheels w/ 8.5+46 in back w/ a 255/35/19 tire, but I'm running a 20mm spacer in back which essentially makes it a 8.5 +26 offset. Your plan of a 9.5 +35 w/ the same tire size will have this result found on this great site. I plugged in the new values w/ my rear setup and the one you're trying to do.

Rim & Tire Size Calculator. Custom Offsets

Tire Tech Information - The Wheel Fitment, Tyre Stretch, Rolling Radius and Speedometer Error Calculator. Play with specs, try different settings, compare results

www.wheel-size.com

If you scroll down it will tell you what to expect, your wheel will be 4mm further out from mine but your tire won't be any further out since the sidewall is stretched a bit (which is a good fit btw). Don't worry about it saying rim will be 22mm further in because mine is pushed out 20mm w/ the spacer, it's only 2mm in from the stock wheel, and 9mm closer for the tire, not a big deal there. I will take a picture w/ a measuring stick so you can see what 4mm further out will be, not enough to be a problem I would think.

 

[blnewto]

Here's a pic I found of a 19x9.5 +35 in back, looks to be running wider than a 255 in back though but you can see how the wheel edge fits, appears to be right at the fender.

 

[tikva98]

Yes, the red G70 is mine, those are the stock wheels w/ 8.5+46 in back w/ a 255/35/19 tire, but I'm running a 20mm spacer in back which essentially makes it a 8.5 +26 offset. Your plan of a 9.5 +35 w/ the same tire size will have this result found on this great site. I plugged in the new values w/ my rear setup and the one you're trying to do.

Rim & Tire Size Calculator. Custom Offsets

Tire Tech Information - The Wheel Fitment, Tyre Stretch, Rolling Radius and Speedometer Error Calculator. Play with specs, try different settings, compare results

www.wheel-size.com

If you scroll down it will tell you what to expect, your wheel will be 4mm further out from mine but your tire won't be any further out since the sidewall is stretched a bit (which is a good fit btw). Don't worry about it saying rim will be 22mm further in because mine is pushed out 20mm w/ the spacer, it's only 2mm in from the stock wheel, and 9mm closer for the tire, not a big deal there. I will take a picture w/ a measuring stick so you can see what 4mm further out will be, not enough to be a problem I would think.View attachment 60897View attachment 60898

That's awesome for doing that! Very much appreciated.
Maybe it's the angle of the photo with the ruler or my eyes playing tricks... it looks like the tyre is sticking out past the fender lol... if you look at it from above do you see any tyre sticking out?
The rear wheels are a +33 offset so I guess another 2mm more? Love the red... have the white pearl which I don't love but does look decent in certain light

 

[blnewto]

That's awesome for doing that! Very much appreciated.
Maybe it's the angle of the photo with the ruler or my eyes playing tricks... it looks like the tyre is sticking out past the fender lol... if you look at it from above do you see any tyre sticking out?
The rear wheels are a +33 offset so I guess another 2mm more? Love the red... have the white pearl which I don't love but does look decent in certain light

When looking straight down the tire sidewall bulge is right at the fender edge, and the wheel is a bit inside from the widest part of the sidewall, maybe 3-4mm.
Your wheel with those offsets will be about 6mm further out, so the actual edge of the wheel will be outside the fender, the top of the tire would still tuck inside the fender edge but the sidewall bulge will also be 6mm out, so that may be a problem w/ your law enforcement~here we don't have to worry about that but it's not the best look. Are there any wheels you like in a similar price w/ a +40 offset by chance??

 

[kbreese72]

When looking straight down the tire sidewall bulge is right at the fender edge, and the wheel is a bit inside from the widest part of the sidewall, maybe 3-4mm.
Your wheel with those offsets will be about 6mm further out, so the actual edge of the wheel will be outside the fender, the top of the tire would still tuck inside the fender edge but the sidewall bulge will also be 6mm out, so that may be a problem w/ your law enforcement~here we don't have to worry about that but it's not the best look. Are there any wheels you like in a similar price w/ a +40 offset by chance??

Yup, that's what I am going with because +35 is too aggressive for the rear and sits too far in for the front. The ideal sizing is 19x8.5+30 front and 19x9.5+40 rear. Avante Garde M-520R's.,.,.custom built, so they make them perfect for whatever car you have. No sticking out too far in the rear and no spacers needed in the front.

Avant Garde Wheels | Genesis G70 | AG M520R Dark Graphite Metallic

Feature a Genesis G70 on our Avant Garde Wheels M520R in our standard Dark Graphite Metallic finish.

www.avantgardewheels.com

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[blnewto]

Yup, that's what I am going with because +35 is too aggressive for the rear and sits too far in for the front. The ideal sizing is 19x8.5+30 front and 19x9.5+40 rear. Avante Garde M-520R's.,.,.custom built, so they make them perfect for whatever car you have. No sticking out too far in the rear and no spacers needed in the front.

Avant Garde Wheels | Genesis G70 | AG M520R Dark Graphite Metallic

Feature a Genesis G70 on our Avant Garde Wheels M520R in our standard Dark Graphite Metallic finish.

www.avantgardewheels.com

that extra 5mm in front may make your steering feel heavier and less responsive, and will cause "scrub" when turning tighter, but something you'll get used to and learn to compensate for over time I would think.

 

[tikva98]

When looking straight down the tire sidewall bulge is right at the fender edge, and the wheel is a bit inside from the widest part of the sidewall, maybe 3-4mm.
Your wheel with those offsets will be about 6mm further out, so the actual edge of the wheel will be outside the fender, the top of the tire would still tuck inside the fender edge but the sidewall bulge will also be 6mm out, so that may be a problem w/ your law enforcement~here we don't have to worry about that but it's not the best look. Are there any wheels you like in a similar price w/ a +40 offset by chance??

not that I've seen... I'll have to have a good think on whether to pull the trigger. Thanks for the help!

 

[kbreese72]

that extra 5mm in front may make your steering feel heavier and less responsive, and will cause "scrub" when turning tighter, but something you'll get used to and learn to compensate for over time I would think.

Thanks, I hear you, but I'm not too worried about an additional 5mm. First off I've seen a lot of you guys running spacers up front that make it +10mm or more compared to OEM specs, with no complaints from the owners. This is half that. Secondly, I've been adding custom wheels with more aggressive offsets front and rear to my cars for about 35 years and never noticed the scrub factor.

Don't get me wrong, I'd like to be able to keep everything perfect OEM specs, but as we all know, it's a balance between that, performance and looks. Personally, I think I chose the perfect compromise, and Avante Garde also felt they were the perfect specs as they can build the wheels with any offset they want. They played with different setups and chose those specs as the most ideal for this particular vehicle, and after 6 months of researching and looking at a ton of setups, I personally agree.

Perfect amount of flushness front and rear, not too aggressive and also not too far sunk in, and no spacers needed. Beautiful classic mesh wheel design that mixes a luxury and sport vibe which perfectly suits the car, Decent amount of concavity, and I also love the Dark Graphite Metallic color and think it will pair really nicely with my Saville Silver exterior. When my OEM tires wear out, I'll go with 235/40/19 front and 265/35/19 PS4S out back (Same tread width as 275), I think that will be spot on.

Obviously that's my own subjective view. To each their own. Cheers.

NOTE: These wheels are not super expensive, but not all that cheap either. Generally around $2k/set delivered. Paid $1926/set delivered for mine from LA Motorsports. Remember though, these are custom built to order and not pulled off the shelf. Also, they are not that light. That's the one downside. They are around 25 lbs each. Still a huge difference compared to the OEM 35 pounders, but I realize there are lighter options out there.

 

[Tones_G70]

To each their own, but I agree with G70King that a 305 looks out of place on a G70. It depends on the specific car. For example, my C6 Z06 had 345's out back. They were perfectly at home on the car, which is a very powerful sports/super car with the fenders and stance, purpose and performance where those tires are right at home. In fact they come with 325's from the factory. However a G70 is a compact sport/Luxury sedan. Personally I think 275, possibly 285 is the max in terms of looking tasteful.

I'm with you 100% here.
I have a 710 HP Mustang and I have a square 275 set up and if you look at the rear of the car, the 275's look very wide. Even on a 2019 Mustang.

(I "eventually" would like to get a killer set of wheels, along with tires, and do a staggered set with the 305's out back. Lots of guys on the forums have them and they fit/look killer.)

 

[kbreese72]

I'm with you 100% here.
I have a 710 HP Mustang and I have a square 275 set up and if you look at the rear of the car, the 275's look very wide. Even on a 2019 Mustang.

(I "eventually" would like to get a killer set of wheels, along with tires, and do a staggered set with the 305's out back. Lots of guys on the forums have them and they fit/look killer.)

Amen, brother, that's exactly what I have on mine, 305 Nitto DR's out back, on Project 6GR wheels made specifically for these cars.

 

[blnewto]

Thanks, I hear you, but I'm not too worried about an additional 5mm. First off I've seen a lot of you guys running spacers up front that make it +10mm or more compared to OEM specs, with no complaints from the owners. This is half that. Secondly, I've been adding custom wheels with more aggressive offsets front and rear to my cars for about 35 years and never noticed the scrub factor.

Don't get me wrong, I'd like to be able to keep everything perfect OEM specs, but as we all know, it's a balance between that, performance and looks. Personally, I think I chose the perfect compromise, and Avante Garde also felt they were the perfect specs as they can build the wheels with any offset they want. They played with different setups and chose those specs as the most ideal for this particular vehicle, and after 6 months of researching and looking at a ton of setups, I personally agree.

Perfect amount of flushness front and rear, not too aggressive and also not too far sunk in, and no spacers needed. Beautiful classic mesh wheel design that mixes a luxury and sport vibe which perfectly suits the car, Decent amount of concavity, and I also love the Dark Graphite Metallic color and think it will pair really nicely with my Saville Silver exterior. When my OEM tires wear out, I'll go with 235/40/19 front and 265/35/19 PS4S out back (Same tread width as 275), I think that will be spot on.

Obviously that's my own subjective view. To each their own. Cheers.

NOTE: These wheels are not super expensive, but not all that cheap either. Generally around $2k/set delivered. Paid $1926/set delivered for mine from LA Motorsports. Remember though, these are custom built to order and not pulled off the shelf. Also, they are not that light. That's the one downside. They are around 25 lbs each. Still a huge difference compared to the OEM 35 pounders, but I realize there are lighter options out there.

Great setup there! I've always liked the Avante Garde wheel line, lots of nice designs/finishes and being able to run custom offsets seals the deal! Nothing wrong w/ a little positive scrub radius, there's a point where it may start to feel intrusive, but where that would be ??? I really like your wheel choice there, goes so well w/ your overall setup & car color, well done.

Was hoping to shop for another wheel set soon for our G70, trying to downsize a lot of stuff as I prepare to retire at the moment though. Really want to get a lightweight 18" setup w/ summer tires and use my OEM 19s w/ All Seasons for the cold months. Found a few sets I like w/ 8.5+35 front 9.5+38 rear, should fill out to the fenders pretty well running a 255/285 stagger.

 

[blnewto]

I'm with you 100% here.
I have a 710 HP Mustang and I have a square 275 set up and if you look at the rear of the car, the 275's look very wide. Even on a 2019 Mustang.

(I "eventually" would like to get a killer set of wheels, along with tires, and do a staggered set with the 305's out back. Lots of guys on the forums have them and they fit/look killer.)

Now that's some HP, any pics, sounds like a friggin' blast!

 

[blnewto]

Amen, brother, that's exactly what I have on mine, 305 Nitto DR's out back, on Project 6GR wheels made specifically for these cars.

You do cars well sir, very nice GT!

 

[kbreese72]

You do cars well sir, very nice GT!

Thanks bro, she's only pushing 825hp, but good enough to pick up some groceries now and then

 

[kbreese72]

Great setup there! I've always liked the Avante Garde wheel line, lots of nice designs/finishes and being able to run custom offsets seals the deal! Nothing wrong w/ a little positive scrub radius, there's a point where it may start to feel intrusive, but where that would be ??? I really like your wheel choice there, goes so well w/ your overall setup & car color, well done.

Was hoping to shop for another wheel set soon for our G70, trying to downsize a lot of stuff as I prepare to retire at the moment though. Really want to get a lightweight 18" setup w/ summer tires and use my OEM 19s w/ All Seasons for the cold months. Found a few sets I like w/ 8.5+35 front 9.5+38 rear, should fill out to the fenders pretty well running a 255/285 stagger.

Sounds like a plan! Regarding these AG wheels, they look good on the previous gen too. Here's the same car as yours, same color and everything with them. I think he is stock height too:

Google Image Result for https://www.genesisg70forum.com/attachments/charlotte-skyline-110322-5-jpg.1076/

Classy look IMHO. Would of course look better lowered.

I think these Vossens look a little better though in your gen & color:

Google Image Result for https://audiocityusa.com/shop/images/D/vossen-wheels-hf-3-gloss-graphite-polished-rims-audiocityusa-18-226ff45f5d.jpg