255/3520 Front with 285/30 or 295/35 20s?

Jason09GT

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Would you want it looking less bulged? Nitto's run narrower, my sidewalls are damn near squared. So please, before you try and correct me again.

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Gabe

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Gabe, please enlighten me aa to where all of this un-ideal bulging is that you speak of.

Would you want it looking less bulged? Nitto's run narrower, my sidewalls are damn near squared. So please, before you try and correct me again.

Well, besides needing picture-taking lessons, you also need glasses.

If you can't see the tire sidewall sticking out beyond the wheels in those pics, here's some red lines to show where each one stops.
Somewhat of a big difference.
Yes, they fit.
No, not ideally.

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Jason09GT

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It's the angle. I walked out in my garage at 2am, and stuck my phone down by the wheel. Yes, the tire sticks out about 1/8th of an inch at the widest part, my apologies if you are a fucking tard that would prefer his wheel be wider than the tire.
 

MassMustang

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I would agree to Gabe's point that the sidewall bulge with 305's on a 20x10 would be more severe than 305's on an 18x10 since the taller sidewall is more forgiving.

I think the fit on your rims (Jason) looks good! Sidewall bulge should be kept to a minimum on 20" rims for sure though.

I'm running 305's on 18x10" rims since I want the old school stance. Those are 255's on 17x8 rims up front.

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Gabe

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It's the angle. I walked out in my garage at 2am, and stuck my phone down by the wheel. Yes, the tire sticks out about 1/8th of an inch at the widest part, my apologies if you are a fucking tard that would prefer his wheel be wider than the tire.

Hey, fuckface, that's the last thing I want.
But I've seen 305/30/20 tires on 20x10 rims, and they all have less-than-ideal sidewall bulge.
Maybe you have special wheels, or special tires, or maybe you're fucking special, I don't give a fukc.
 

Pentalab

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http://www.nittotire.com/passenger-tires/nt555-g2-ultra-high-performance-tire/

The Nitto NT-555-G2 in the 305-30-20, specs state the measuring width is 11".
The range of acceptable widths is narrow for that tire. 10.5" MIN...and 11.5" MAX.
So you only have (+/- .5" to play with) That's due to the short sidewall, 91.5mm.

Mounting the NT-555-G2 in a 305-30-20 on a 10" wide rim is well below their stated MIN rim width.
No tire shop in my town would have installed his combo. Tire rack won't either. Although the tire in question will fit a 10" rim, it's not advised.

If you look carefully in the 1st pix on posting #22, you can see the excess wear, where the edge of the tread rolls over into the sidewall.
 

Jason09GT

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I guess they can exhibit "excess wear" after 32k miles on, not having been rebalanced, or rotated in anyway, 32psi, and rock out
 

o2sys

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Aren’t the INVOs supposed to be quiet? Everyone I keep talking to about these the first thing they mention is how noisy they are???


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46addict

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http://www.nittotire.com/passenger-tires/nt555-g2-ultra-high-performance-tire/

The Nitto NT-555-G2 in the 305-30-20, specs state the measuring width is 11".
The range of acceptable widths is narrow for that tire. 10.5" MIN...and 11.5" MAX.
So you only have (+/- .5" to play with) That's due to the short sidewall, 91.5mm.

Mounting the NT-555-G2 in a 305-30-20 on a 10" wide rim is well below their stated MIN rim width.
No tire shop in my town would have installed his combo. Tire rack won't either. Although the tire in question will fit a 10" rim, it's not advised.

If you look carefully in the 1st pix on posting #22, you can see the excess wear, where the edge of the tread rolls over into the sidewall.
Yeah I'd rather have a wheel that is slightly wider than the tire. This helps handling response. Jason's tires are bulging any way you look at it.
 

Norm Peterson

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It's the angle. I walked out in my garage at 2am, and stuck my phone down by the wheel. Yes, the tire sticks out about 1/8th of an inch at the widest part, my apologies if you are a fucking tard that would prefer his wheel be wider than the tire.
Point taken concerning the reason for the picture quality. But the matter of the situation being difficult to assess stands. I suggest taking a straightedge and a small ruler and getting some real numbers. I'm betting on it being more like 1/2", maybe 5/8".

Looking at the wheel/tire on the car shows a fair amount of 'bulge' if you look at the bottom, down by the floor. It doesn't look all that bad from that point of view, but it does become a pretty significant amount of curvature in the next picture with the wheel and tire laying flat on the floor. As mentioned earlier, there isn't much sidewall height for this to be distributed over.

Regarding 'bulge' . . . it's really just an indication of sidewall stiffness, which loosely translates to handling characteristics. Sharper curvature generally means softer and less precise cornering and handling, possibly a little more work for any nannies.

You may be OK simply because you've got so much tire size stagger that the front tires saturate before the rear tires get even close to sliding. After all, understeer is stable and relatively undemanding of driver skill most of the time - dare I suggest this is 'comforting' to most people?.


Sure, you can get 305/30's to mount up on 10" wide wheels. And they'll hold air. But that's not a good working definition of 'perfect fit'.

That said, as a short-term solution, 1/2" below min-recommended is do-able without extreme downsides. But it's not an ideal situation for long-term use or use without some restrictions on that use.


It truly puzzles me why people are so insistent on buying tires that are too wide for the wheels (this judgment being per tire mfr and the T&RA tables that they work to). Say what you will about an appearance preference, but a wheel/tire 'look' that impresses spectators (aka self-appointed style judges) at a Cars & Coffee meet doesn't mean squat as far as actual tire behavior is concerned.


Norm
 

Norm Peterson

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Something else to consider.

As I understand it, tire load ratings are based on tire deflections under load. More load causes greater deformation - which is just a fancier way of saying 'sharper curvature in the sidewalls'. From this comes greater heat build-up.

So with a 'squeezed' setup you're already starting at no added load with the sidewall shape you'd normally have to put some extra stuff in the car to get, leaving you with less headroom against the tire's rated capacity at whatever pressure you have it inflated to.

This does not mean you've created an 'instant-fail' situation. But you'd be compromising away an unknown amount of the margin built into tire design, which does have fatigue-life consequences.


And then there's the matter of reduced reserve stability from a squeezed setup if you're unfortunate enough to experience a sudden loss of inflation pressure in a rear tire while driving.


Norm
 

FASTGT2006

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I want to try the NITTO INVO tires with 255/35/20s up front but don't if I should go with 285/30s or 29/35s as Invos are only offered in those sizes within 285-295 range for my 20x10 rears.

295/35 is 4% bigger compared to the fronts so don't know how that will look.

Can anybody post pics of their Invo tires with either size?
 

Pentalab

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Flip side to all this is actual tread width. Nitto's typ run narrower. I just looked at one of the tires on corner carvers... a 295-40-18... it had a tread width of 10.5". A nitto 555-G2 in 305-35-19 has the same 10.5" tread width. Nitto 555's in 275-40-18 have a 9.75" tread width...and a 285-40-18 is only 10.0" .

Running a tire, say at the min recommended rim width, is ok for the rears.... but it's really not good for the fronts.... too rubbery, sluggish... you won't like the handling..and that's with the narrower nitto's. Any other tire that runs wider for a given size, used on it's min rim width, on the fronts, will be an awful handling mess.
 

mavisky

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I've got 285/30-20's on my 20x10's. I'm not huge on the skinny sidewall, but with factory 3.31's I didn't want to make the gearing any longer at the time I bought them. Now that the car makes another 110whp than it did when I bought them I'm not so concerned and will probably do a 295/30 or 295/35 if I stay with Nittos or go to a 285/35 if I go to a tire that's a little wider. Tires are Nitto's so they tend to run a bit skinnier than some other brands for the same sizes.

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