Wide Wheels and Tire Sizing G70

[blnewto]

Thanks for those replies and agree on the classy look of both those sets, and yeah, 825 hp, putting shear terror in those tires lol.

 

[Tones_G70]

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

Only 710HP and 610TQ. lol
She'll be 6 years old in July,......not even 3k on the clock.

 

[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??

Any potential issues with fender rub btw?

 

[blnewto]

Any potential issues with fender rub btw?

Without actually having that wider setup I can't confirm that, trying to visualize from my current setup it would seem it would tuck ok though, but ???

 

[Volfy]

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.

That certainly is a valid point.

The flip side is... just because you rarely hear of folks complaining that they had problems with incorrectly set up wheel offset doesn't mean there weren't any. Most folks don't even know there is such a thing as scrub radius, much less what it does and how it affects handling. I've seen no shortage of crashed Stingers and G70 posted on FB groups. Most blame bald tires, other drivers, slick roads, the weather, etc., etc. How many of them have the present of mind for proper post-event analysis to know if wrong offset (scrub radius) played a part in their misfortune? If I have to guess... none.

Scrub radius affects asymmetric transient handling, not steady state. That mean when you are just cruising merrily down the hwy, there is virtually no immediate effect. Even when the car is in a turn, as long as both front wheels are experiencing similar road conditions, any effect overall is minimal.

HOWEVER... what happens when one front wheel hits a big puddle of water? Or you veer off the tarmac and one side gets past the road shoulders into the weeds? In both of those cases, excessive front positive scrub radius will tend to pull your car deeper into the weeds, or more into the puddle. This can be very destabilizing. Startled, an inexperience driver might instinctively yank the steering wheel in the opposite direction in an attempt to pull back towards the roadway center. At higher speeds, this can induce an adverse yaw response in the chassis and quite possibly snap oversteer and/or spin the car out of control.

How likely would the driver know enough to blame the gorgeous $2500 set of shiny wheels/tires/spacers that made their car look oh-so sexy?

 

[kbreese72]

That certainly is a valid point.

The flip side is... just because you rarely hear of folks complaining that they had problems with incorrectly set up wheel offset doesn't mean there weren't any. Most folks don't even know there is such a thing as scrub radius, much less what it does and how it affects handling. I've seen no shortage of crashed Stingers and G70 posted on FB groups. Most blame bald tires, other drivers, slick roads, the weather, etc., etc. How many of them have the present of mind for proper post-event analysis to know if wrong offset (scrub radius) played a part in their misfortune? If I have to guess... none.

Scrub radius affects asymmetric transient handling, not steady state. That mean when you are just cruising merrily down the hwy, there is virtually no immediate effect. Even when the car is in a turn, as long as both front wheels are experiencing similar road conditions, any effect overall is minimal.

HOWEVER... what happens when one front wheel hits a big puddle of water? Or you veer off the tarmac and one side gets past the road shoulders into the weeds? In both of those cases, excessive front positive scrub radius will tend to pull your car deeper into the weeds, or more into the puddle. This can be very destabilizing. Startled, an inexperience driver might instinctively yank the steering wheel in the opposite direction in an attempt to pull back towards the roadway center. At higher speeds, this can induce an adverse yaw response in the chassis and quite possibly snap oversteer and/or spin the car out of control.

How likely would the driver know enough to blame the gorgeous $2500 set of shiny wheels/tires/spacers that made their car look oh-so sexy?

But would you consider +5mm "excessive"? I understand your point here, but look at how many millions of people have been putting aftermarket wheels on their vehicles for how many decades? Almost all of those wheels have a more aggressive offset. I mean there are 1000's upon 1000's who even take their car to the track and compete at high levels. And what about all the truck guys that have added INCHES to their offset with wheels that stick way out past the fenders not to mention adding huge extremely heavy tires. I've seen plenty of car guys too that have ridiculous wheels sticking way out past the fenders as well.

Not questioning your info, but I personally don't think it's all quite that doomy and gloomy, especially for reasonable setups with minor increases in offset.

That's of course just my opinion. Thanks for the feedback.

 

[Volfy]

But would you consider +5mm "excessive"? I understand your point here, but look at how many millions of people have been putting aftermarket wheels on their vehicles for how many decades? Almost all of those wheels have a more aggressive offset. I mean there are 1000's upon 1000's who even take their car to the track and compete at high levels.

In and of itself, a wheel offset variance of+5mm typically will not cause the car to handle like what I described above. Guys that slap on 20mm or 25mm spacer purely for looks, without nary a thought on the handling implications... yeah, not a good idea.

One reason I usually encourage folks to stay within 2-3mm of stock setting is because folks would invariably think that if 2-3mm is perfectly fine, then 5mm should be okay. So... if I say up front 5mm is okay, folks would push that up to 8-10mm. So on and so forth. It's just human nature.

Another reason is that scrub radius is affected by more than just the wheel offset variance. Changing the tire rolling diameter will shift the intersection of the tire center line and the kingpin axis inclination (KPI). So will adjusting front camber angle by shifting the top camber plate on a MacPherson strut. When suspension tuning, these variances superimpose over each other, to arrive at a new scrub radius. Question is... would the driver know how each of these factors add or subtract from the SR?

Yet another consideration is that what scrub radius is optimum depends on the use case. For running track/AutoX, we run 8mm or 10mm hubcentric spacers to put the "combined effective offset" around 28mm. I prefer that setting because the slight inherent steering instability can be desirable in that application, because it can aide corner tip-in. For everyday driving on public roads, away from the safety of a closed course, that might be a bit much for my comfort level.

At the end of the day, it is your car and you in it. I don't ever say you MUST NOT do this-or-that... only that you should understand what this-or-that does to your car's dynamic handling traits. As long as you do and are willing - and prefer - to operate your car with those handling traits... by all means.

 

[Volfy]

And what about all the truck guys that have added INCHES to their offset with wheels that stick way out past the fenders not to mention adding huge extremely heavy tires. I've seen plenty of car guys too that have ridiculous wheels sticking way out past the fenders as well.

Well... there are no shortage of drivers doing all sorts of dodgy mods to their rides. Brodozer, slammed lowriders, slabs & swangers, stance cars, blacked-out headlights/tail-lights... you name it. Just because thousands of folks have done them and lived to breathe another day doesn't means those mods are all legit.

I tell my kids they should pick their role models judiciously. Just because the cool kids walk around showing their boxers over pulled-down pants doesn't mean you should too.

 

[Tones_G70]

And what about all the truck guys that have added INCHES to their offset with wheels that stick way out past the fenders not to mention adding huge extremely heavy tires. I've seen plenty of car guys too that have ridiculous wheels sticking way out past the fenders as well.

LOL

 

[kbreese72]

Well... there are no shortage of drivers doing all sorts of dodgy mods to their rides. Brodozer, slammed lowriders, slabs & swangers, stance cars, blacked-out headlights/tail-lights... you name it. Just because thousands of folks have done them and lived to breathe another day doesn't means those mods are all legit.

I tell my kids they should pick their role models judiciously. Just because the cool kids walk around showing their boxers over pulled-down pants doesn't mean you should too.

No doubt. My point was simply that, for more than half a century there have been millions upon millions of folks out there with extreme setups, many of whom have driven their vehicles very hard with no major issues, and no accidents. Heck, we all see them cruising down the highway 70+ mph every day. At least I know I do!

IMHO, if scrub radius was really THAT important and THAT much of a safety hazard, than most people would know about it, at least generally... the same way people know about tires, brakes and seat belts. Now, I'm certainly not claiming that SR is insignificant by any means... but after all this time, there's a reason most people have never heard of it.

Don't get me wrong... I appreciate the info...I mean it's good forum knowledge, and tasty food for thought, it's just that I'm personally not too worried about the measly +5mm offset on the custom wheels that Avante Garde is specifically building for this vehicle.

By no means am I pushing extreme setups, I only mentioned them to comparatively demonstrate why I am not too concerned about my particular setup. Or any of the other within reason +xx mm custom wheel setups I've had for the past 35 years on dozens of trucks, muscle and sports cars.


Here's my tuned E85 5.0 F150 (13.5 sec 1/4 mile) with death-defying SR, that I've driven quite hard on and off-road for 45k miles and no issues: (+43mm offset beyond OEM)

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[Volfy]

LOL... your truck looks sane compared to the brodozers we have here in TX.

If you think the concept of scrub radius is nebulous, you should try wrapping your head around roll center and roll moment. Just because these parameters are near impossible to gauge with the naked eye, it doesn't mean their associated effects aren't there.

Frankly, even when a parameter is easily visible - like camber - lots of drivers still do whatever they wish anyway. I'm sure there will be legions of stance car drivers that will swear up and down they've driven their cars 1000's of miles just fine. I don't think I've ever seen one of them posting in open forum they totaled their prized ride BECAUSE of their ridiculously exaggerated negative camber. Confirmation bias plays a huge part in why that is.

If you're okay with how you set up your vehicle(s), that's all that matters.

 

[blnewto]

Got a new 18" summer set, much lighter and kept it budget friendly (especially since there were Black Friday savings too). Superspeed Flow Formed w/ the following specs~18x8.5+35 & 18x9.5+45, wanted to keep offsets close to OEM and they make the 9.5 in a +38 too but didn't want any poke so settled on the +45. Front wheel weight is 18 lbs and the rear wheels are 19 lbs and tires weigh approx 25 & 28 lbs so should be very noticeable behind the wheel. Wheels were packed extremely well w/ plenty of edge protection and box foam reinforcements, were flawless upon inspection.





Checked Brembo clearance and much more room than OEM 19s to the back of the spokes (at least 5mm more clearance).




Rear fit



And the tires in a 255/40/18 front 285/35/18 rear, these are Petlas Velox Sport tires, quite a few on the C5 Corvette forums run them, seem to grip & wear well, and about a 3rd of the price of the Pilots. Will definitely post some reviews of them when I get some time w/ them. Going to get these mounted up tomorrow, but since it's winter time will probably just put them on to make sure the TPMS is reading properly and make sure they're vibration-free then store them until April.


Here's the TPMS I'm using, seem to be very high quality and pre programmed for the G70, so hoping they will link up just fine.

Amazon.com

 

[NCBuckeye]

Stance
19x8.5 +25
19x9.5 +35

 

[blnewto]

Stance
19x8.5 +25
19x9.5 +35

What tire size did you go with? looking good!

 

[NCBuckeye]

What tire size did you go with? looking good!

Those are the factory tires. Need to lower it next...that will be in a few weeks.

 

[kbreese72]

Stance
19x8.5 +25
19x9.5 +35

Its amazing how the Koreans hide the gap and ride height with their OEM wheel designs, because with those aftermarket wheels it's just looks totally off. No worries though, I'm sure it will look good once it's lowered.

 

[kbreese72]

Got a new 18" summer set, much lighter and kept it budget friendly (especially since there were Black Friday savings too). Superspeed Flow Formed w/ the following specs~18x8.5+35 & 18x9.5+45, wanted to keep offsets close to OEM and they make the 9.5 in a +38 too but didn't want any poke so settled on the +45. Front wheel weight is 18 lbs and the rear wheels are 19 lbs and tires weigh approx 25 & 28 lbs so should be very noticeable behind the wheel. Wheels were packed extremely well w/ plenty of edge protection and box foam reinforcements, were flawless upon inspection.



View attachment 61019

Checked Brembo clearance and much more room than OEM 19s to the back of the spokes (at least 5mm more clearance).
View attachment 61021

View attachment 61022

Rear fit

View attachment 61023

And the tires in a 255/40/18 front 285/35/18 rear, these are Petlas Velox Sport tires, quite a few on the C5 Corvette forums run them, seem to grip & wear well, and about a 3rd of the price of the Pilots. Will definitely post some reviews of them when I get some time w/ them. Going to get these mounted up tomorrow, but since it's winter time will probably just put them on to make sure the TPMS is reading properly and make sure they're vibration-free then store them until April.
View attachment 61024

Here's the TPMS I'm using, seem to be very high quality and pre programmed for the G70, so hoping they will link up just fine.

Amazon.com

View attachment 61025

Clean. Seem a bit heavy for 18's with a light weight look though. Are they cast wheels as opposed to flow forged?

 

[blnewto]

Clean. Seem a bit heavy for 18's with a light weight look though. Are they cast wheels as opposed to flow forged?

18 &19 lbs is very light, about the same as 18" T37s, and 4 lbs lighter than gram lites, and just a few ounces heavier than Enkei RPF1s.

My previous set of 18x9.5 Wedsport SA10R on my Infiniti G were 20lbs. , all are definitely Flow formed. I've had cast wheels on a few, and yeah, they're much heavier.

 

[kbreese72]

18 &19 lbs is very light, about the same as 18" T37s, and 4 lbs lighter than gram lites, and just a few ounces heavier than Enkei RPF1s.

My previous set of 18x9.5 Wedsport SA10R on my Infiniti G were 20lbs. , all are definitely Flow formed. I've had cast wheels on a few, and yeah, they're much heavier.

LOL, sorry about that man, I accidentally read the weights of the tires, haha. That's why I was like WTF they look like they'd be really light. Yeah those are ultra-light for sure!!

 

[blnewto]

LOL, sorry about that man, I accidentally read the weights of the tires, haha. That's why I was like WTF they look like they'd be really light. Yeah those are ultra-light for sure!!

lol, when I re-read my post I could see how that could happen, have a good one