Wide Wheels and Tire Sizing G70

[JLEW]

I like your wheel choice and do not know if they will fit, but I like this ET calculator to compare.

JR-WHEELS

JR-Wheels is a unique collection of rims created over the years based on the latest automotive trends using advanced technologies such as flow forming.

jr-wheels.com

 

[blnewto]

I like your wheel choice and do not know if they will fit, but I like this ET calculator to compare.

JR-WHEELS

JR-Wheels is a unique collection of rims created over the years based on the latest automotive trends using advanced technologies such as flow forming.

jr-wheels.com

this one is my favorite, will give a detailed list of what to expect when trying new setups. It also has a section for all OEM tire & wheel sets.

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

 

[blnewto]

Hello, new to the Genesis brand and have been researching like crazy to try and find an answer. This thread has gotten me close to an answer but not quite. want to run a square setup on my '24 Sport Prestige. I think these will fit, but front will be tight with 255/35R19 tires. Braelin BR12 19x9 +30 all the way around.

View attachment 60579

From @Volfy info it looks like a 18x8.5 +35, or 19x8.5 +35 is the best size for a square setup, this retains factory scrub radius and allows for a 255 width tire. The 9" +30 when running a 255 will poke outside the fender in front and will be 5mm positive from the factory 35mm scrub radius.

 

[TPSCRT]

Yes, understand the center bore would need to be updated, but was more about width and offset

 

[TPSCRT]

From @Volfy info it looks like a 18x8.5 +35, or 19x8.5 +35 is the best size for a square setup, this retains factory scrub radius and allows for a 255 width tire. The 9" +30 when running a 255 will poke outside the fender in front and will be 5mm positive from the factory 35mm scrub radius.

Thank you. Kinda what I was thinking as well.

 

[Volfy]

A lot depends on your priorities. If all you care about is looks, parameters like the scrub radius might not be important to you. OTOH, if handling is tops on your list, then it would behoof you to understand why the OEM wheel offsets are what they are, so you might have an idea what to expect if you do venture away from stock offset - and whether you might find the resultant handling traits acceptable.

I do believe it is entirely possible to design a reasonably offset 9" wide wheel that would fit on the G70/Stinger front axle. Afterall, it's only 0.25" wider (on each side) than the many 8.5" wheels that have proven to work quite well. The problem is that many aftermarket wheel manufacturers consider 9" or wider wheels more for rear wheel fitment, so they optimize their 9"+ wheel profiles to suit rear wheel applications. This usually means the face of the wheel has more curvature to it, which often cuts into clearance space for the larger front brake calipers (like the Brembos on G70). I'm not familiar with Braelin wheels to know if that holds true. The Enkei and Konig wheels I've looked at certainly follow that trend. You could call and ask Braelin about this. At the end of the day, you probably won't know for sure until you bolt the wheel on the car.

 

[ejguillot]

@Volfy Looking for your advice on my intended wheel and tire package.

Front: 18x8", stock offset, 245/45ZR18 (Nitto NT555G2)
Rear: 18x9.5, (what offset?) 275/40ZR18 (Nitto NT555G2 or NT555RII drag radial)

Rims to be the lightest affordable ones I find (Enkei or equivalent), rim sizing is what Nitto recommends for these tires. Main priority is lighter weight and more sidewall for better ride quality, acceleration/braking, and being able to fit the drag radial (for test and tune day outings).

Any specific recommendations for wheels/rims?

 

[Volfy]

@Volfy Looking for your advice on my intended wheel and tire package.

Front: 18x8", stock offset, 245/45ZR18 (Nitto NT555G2)
Rear: 18x9.5, (what offset?) 275/40ZR18 (Nitto NT555G2 or NT555RII drag radial)

Rims to be the lightest affordable ones I find (Enkei or equivalent), rim sizing is what Nitto recommends for these tires. Main priority is lighter weight and more sidewall for better ride quality, acceleration/braking, and being able to fit the drag radial (for test and tune day outings).

Any specific recommendations for wheels/rims?

For the front, I'd go with 18x8.5, which would better support your front tires. I've not had 245/45R18 so have no personal experience to offer. IMO, it's a bit too tall for my preference. It won't do anything 235/45 couldn't do just as well. I've had 235/45R18, 245/40R18, 255/40R18 and would recommend any of them. 235/45 for best ride comfort. 245/40 the sportiest handling. You can go with 18x8, but you'd be limited to 245. For the front, I prefer the wider range of tire width options 18x8.5 accommodates. Any weight gain vs. 18x8 would be negligible.

For the rear, again I have no personal experience with anything wider than 255/40 on this chassis. I assume yours is the 3.3T. Otherwise, for the 2.0T, anything wider than 255 is mostly for looks and offers no real-world performance benefit. Judging by you tire choice, you are looking to set up for a weekend dragster. For that, you'd want good power handling and plenty of tire compliance. That mean the narrow side of rear wheel widths for the given tire size. For 275, that means 9-9.5" wheels. What you spec'ed would work fine. As for offset, again, I have no personally experience with wider than 255 on 8.5, so I'd defer to those who have mounted sizes closer to what you stated. Offset on the rear axle isn't as critical as for the front, so as long as the wheel stays inside the wheel well and clears the fender lip, you should be fine. Just don't go nuts and spec an overly deep dish (high concavity) that pushes the rear wheel wayyy out there. "Isn't as critical" doesn't equal "doesn't matter." Going too wide in the rear will still introduce handling issues.

 

[thatjawncrazy]

Well I don’t understand there’s 2 guys who were able to fit 305’s on 19inch rims , I’m tryna do it at 18x10 , maybe 40 aspect ratio with a 45 offset, either 45et or 30et , but 30 will stick out and look ugly But idk man I want 305’s on lagunas welds, wanna b first genesis with welds,

i can GUARANTEE neither of those two guys ran 45 sidewall on 19 inch rims. 45 is your problem, that would be ridiculously huge on a G70. +45 offset would be the right fitment, you got that right. but that sidewall is why this wouldn't work. see the comparison with my setup which completely fills the fender.

https://imgur.com/suwHKKs

hey ik i been botheringu so much becuase im also tryna run 305's in the rear, but on 18's x10 not 19x10.5 so if anything mine should work to right?, tires would either be 305/40/18 or 305/45/18, i doubt 45 will work because it mess up my speedometer, and liftme up which i dont mind. im also on lowering springs by ark performance, drops .75 inches all around, since ur dropped now u r now experiencing rubbing which is a no for me so i gotta get my lazy ass up and do measurements, the poke is nice i dont mind urs i should expect same like urs

well let's look at what if you ran 18x10.

https://imgur.com/i2eiHtW

nope, wouldn't fit. this would be 1.64 inches TALLER than the tires i have on my car, which already take up the entire fender. not to mention slicks usually have soft sidewall and so even if you managed to tuck the slicks into your wheel wells, on any kind of turn they would slide around side to side and hit your inner fender.

get R888Rs man...lol

 

[DaniZ]

For anyone who’s interested, I’m selling the wheels and tires from my car since I sold it. The wheels and tires had no rubbing when I was stock ride height and lowered. The wheels weigh 20-22 lbs each and they have PS4S on them with 70-80% tread on them. I’m local to Dallas but I’m willing to ship. $1400 OBO

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[blnewto]

For anyone who’s interested, I’m selling the wheels and tires from my car since I sold it. The wheels and tires had no rubbing when I was stock ride height and lowered. The wheels weigh 20-22 lbs each and they have PS4S on them with 70-80% tread on them. I’m local to Dallas but I’m willing to ship. $1400 OBO

Pics of wheels and wheel tire specs if you don't mind. thx!

 

[DaniZ]

Pics of wheels and wheel tire specs if you don't mind. thx!

Front 255/35/19 19x8.5 +32
Rear 305/30/19 19x10.5 +45

 

[DaniZ]

Front 255/35/19 19x8.5 +32
Rear 305/30/19 19x10.5 +45

Sold these

 

[j.drew.36]

I’m pretty sure I figured it out and placed my order. Rotary forged wheels 19x8.5 +32 in front and 19x10.5 +45 in back. It’ll be able to fit 255/35/19 up front and 305/30/19 in back. With this offset you’re basically fitting the widest possible tires on a g70. You may be able to lower it but I’m not lowered.

Just a question about insurance companies with this setup, is there a rule where you can’t exceed the stock rim width by more than one inch?

 

[kbreese72]

I like the way it looks. Having more tire makes it look sportier and more aggressive. Being able to run summer tires instead of radials is amazing year round

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.

 

[blnewto]

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 think a 255/285 combo looks just about right and I'm a 62 yr old car guy lol. I had 295s on my Infiniti G and they were a bit much, does look pretty cool w/ those steamrollers back there but probably better suited for a Challenger, Mustang 5.0 etc.

 

[kbreese72]

...with the caveat that alignment is to be corrected for the new suspension and wheel/tire setup.

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 19x9.5, 5x114.3, 35mm offset, (67.1 so hub-centric), using OEM 225/40/19
2x ARK-AB52S 19x8.5, 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?

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?

Best,
Kbreeze

 

[blnewto]

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 19x9.5, 5x114.3, 35mm offset, (67.1 so hub-centric), using OEM 225/40/19
2x ARK-AB52S 19x8.5, 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?

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?

Best,
Kbreeze

Keep in mind adding a 10mm spacer in front will really affect your scrub radius, +34 is the engineered optimum scrub radius and w/ that spacer you'll be at +25, so a lot of extra positive scrub radius. I think I'd rather go w/ a 255 tire on those front wheels and a 285 in the rear, unless you were planning on using your original tires. If that's the case I'd run them as-is and just deal with that tucked front tire, and when they're worn out replace w/ the wider tire set

 

[kbreese72]

Keep in mind adding a 10mm spacer in front will really affect your scrub radius, +34 is the engineered optimum scrub radius and w/ that spacer you'll be at +25, so a lot of extra positive scrub radius. I think I'd rather go w/ a 255 tire on those front wheels and a 285 in the rear, unless you were planning on using your original tires. If that's the case I'd run them as-is and just deal with that tucked front tire, and when they're worn out replace w/ the wider tire set

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 with snow at some point. Wider tires aren't ideal for that.

So yeah I was thinking of just sticking with the OEM tires, especially since I have less than 5k miles on the car, so the tires are like new. Plus I feel those A/S Michelins are good tires as well.

Maybe my best bet is just doing 19x8.5's ET35 all around. I don't know though....I wanted that concave look at least out back. Sigghhh. So many considerations.

And THEN I still have to decide which springs to go with haha.

On that note...does anyone know the spring rates for the H&R's....or are they still 100% top secret with giving out their numbers.

 

[blnewto]

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 with snow at some point. Wider tires aren't ideal for that.

So yeah I was thinking of just sticking with the OEM tires, especially since I have less than 5k miles on the car, so the tires are like new. Plus I feel those A/S Michelins are good tires as well.

Maybe my best bet is just doing 19x8.5's ET35 all around. I don't know though....I wanted that concave look at least out back. Sigghhh. So many considerations.

And THEN I still have to decide which springs to go with haha.

On that note...does anyone know the spring rates for the H&R's....or are they still 100% top secret with giving out their numbers.

Here's the way my rear tires w/ stock 19x8.5 +46 sit w/ a 20mm spacer (so a +26w/ spacer), so this would be almost identical (at the fender edge) to your 19x9.5 +35, just the wheel edge would be 4mm further out. Your front tires would be 6 mm out from mine so that would probably look less aggressive?? And here's those specs on this link

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

The folks over on the Stinger board really like the H&Rs but they may drop a bit deeper than the GT-S, and for sure more than the Eibach. Eibach seems to be the safe bet here, not too aggressive but a well rounded spring set. If I ever lower mine I would go w/ the H&R set that's only available from Germany as it's better balanced for the RWD without the reverse rake that the others tend to have (for the RWD 3.3 G70s). Since you have AWD I think all the spring choices are better in regard to a level drop F&R.