315/30/18 mounted, fitted and not rubbing

[Auraraptor]

Looks like I would still be able to squeeze by with 295s at ET27 on a 10.5.

Thanks for the PM!

[Bryson]

Looks like I would still be able to squeeze by with 295s at ET27 on a 10.5.

Thanks for the PM!

Yep, I think so and no problem. Thank you for the info about the PS2s! I guess the next tire I'll have to try something else..

[Auraraptor]

No problem.

Thanks for your experience as well.

[vinnyricci]

UPDATE, it appears that I hadn't heeded the advice given below well enough before taking the car out for some serious corners. Well, after about 30 miles of driving and a few hard offramps, I've found that the tire deflects so much on the rim that it actually rubs on the control arm and inner fender well. I measured about 5mm clearance to the inside, so I thought that this was plenty, but I was mistaken!! This tire sidewall deflects at least that much when mounted on a 10.5" wheel..

Now what I've done to rectify the situation is buy 3mm and 6mm spacers. Currently, I've put on the 3mm spacers but haven't hit any hard corners as it's been raining. I can however report that there is no fender contact on full compression with them on. So that means that et24 with rolled fenders is still enough to clear. With trimmed fenders, it looks like et21 or even so far as 18 can still clear. This also gives hope that you could run an et22 18x11" wheel with this tire (less sidewall deflection) in combination with trimmed fenders. It would be close but should work.

I am now recommending an offset of 24mm, possibly even lower if need be. I'll keep this thread up to date as I get some more 'testing' done.

hey. I like what you have discovered. thats awesome. question for you... you ran 285's before for your rear tires. im expecting that you didnt rub. i running currently 275/30/19 rear by 245/35/19 front without spacers and the ride is perfect...no rubbing at all and handles well. if i wanted to fit a 285/30/19 on my rears...on a 10 width rim...will it fit ...and will i not rub without spacers? thanks

[Imndeep]

hey. I like what you have discovered. thats awesome. question for you... you ran 285's before for your rear tires. im expecting that you didnt rub. i running currently 275/30/19 rear by 245/35/19 front without spacers and the ride is perfect...no rubbing at all and handles well. if i wanted to fit a 285/30/19 on my rears...on a 10 width rim...will it fit ...and will i not rub without spacers? thanks

It all depends on your wheels ET whether it will rub or not.

[Bryson]

hey. I like what you have discovered. thats awesome. question for you... you ran 285's before for your rear tires. im expecting that you didnt rub. i running currently 275/30/19 rear by 245/35/19 front without spacers and the ride is perfect...no rubbing at all and handles well. if i wanted to fit a 285/30/19 on my rears...on a 10 width rim...will it fit ...and will i not rub without spacers? thanks

as Imndeep said, it depends 100% on the offset.

Here's a shot of et24 from the back, just a very slight amount of rubbing on hard corners..

[Fatandre]

Thats amazing!!! I want this

[TxGR8White]

Thats amazing!!! I want this

Your "list" must be 10 pages long - you want everything!

LOL

[Fatandre]

Your "list" must be 10 pages long - you want everything!

LOL

Wanting something does not mean you can have it. Yes, the list is long, but doable.
Haters gona hate

[Bryson]

[Imndeep]

Bryson, looking at this view, With my current wheel ET20 I have 0.10 inch from being flush with the body line and 0.55 inch from the trailing arm. I'd really like to run those 315/30-18's but I fear that they'll ride hard on the inner quarter panel, What do you think? Yes my quarters have been rolled. Forgive the dirty Vette, it's my DD.



Chris

[moonfresh]

as Imndeep said, it depends 100% on the offset.

Here's a shot of et24 from the back, just a very slight amount of rubbing on hard corners..

That is a PHATASS!!!! LOL! Damn Eisenman is in my way.

@Imndeep...shouldn't you have more room where the fenders and rim meet? I am always confuse with the offsets. I plan to put 5mm spacers on my rim (et 22). And the guy on ebay has 16 sets of those 315s left. Shall we do a group buy?

[Imndeep]

I need to listen to what I told vinnyricci myself, no matter how much I want those 315's they will not work with my ET with only 0.1 inch from the outer wheel lip to the outer surface of the quarter panel I don't know If I can fit 295/30-18's in there. and the 295/35-18 is a 26.1 inch tire, maybe a little too tall

[Bryson]

I need to listen to what I told vinnyricci myself, no matter how much I want those 315's they will not work with my ET with only 0.1 inch from the outer wheel lip to the outer surface of the quarter panel I don't know If I can fit 295/30-18's in there. and the 295/35-18 is a 26.1 inch tire, maybe a little too tall

Yeah, I don't think you'll fit with 315s.. You'd have to trim the fenders all the way down and roll the lips out just a little like Wolf/Wokke's car. You should be able to do 295s after trimming the fenders down though.

I think I'm happy with et24 right now after ticking the tire pressure up to 38psi, pretty much eliminated the rubbing and I didn't have to take a cutting wheel to my fenders


2/16:

It just occurred to me that my subframe bushings are totally shot and on my to do list. It's certainly plausible that this is allowing my subframe to move more than normal, allowing the tire to come closer to the inner fender well during cornering. Hopefully, I'll be doing new subframe bushings with Olin in SD next weekend on our 8's and can report back on the improvements. I'm going for CSi bushings

[Bryson]

Still at et24 and am going to replace my subframe bushings as I found one completely torn around the circumference. 240k mile dead bushings could have easily been causing the rubbing under extreme cornering as static clearance is 5-8mm.

Anyway, it was a nice day today so on my way out with the girlfriend I dragged her along to snap a few (okay, a lot of) photos

























Oh, and I bought these..

[8eights]

Gorgeous, His and her Turbo's too eeh?

[Bryson]

Gorgeous, His and her Turbo's too eeh?

I was planning on running single, but the deal was too good to pass up! Twin internally wastegated twin scrolls, mmm

[8eights]

Exciting! Please continue to update.

[Fatandre]

Those turbos look promising.

[sofiabghome]

Bryson,

The car looks fantastic. The fitment and the tire to wheel side wall is just perfect. !

One of these days I will give you a rig and come up with my E24 M6 and kill some time talking for our toys.

Think twice before you to install turbo...I personally will not do a turbo..

Anri

[taylorpatterson]

Looking good Bryson. A lean mean silver bullet machine! Have bushings too, awaiting instructions, date, time... looking forward to it.

[Imndeep]

Bryson, looks like you converted to 3 inch wheel studs in the rear. Reasoning?

[Bryson]

Exciting! Please continue to update.

Of course

Bryson,

The car looks fantastic. The fitment and the tire to wheel side wall is just perfect. !

One of these days I will give you a rig and come up with my E24 M6 and kill some time talking for our toys.

Think twice before you to install turbo...I personally will not do a turbo..

Anri

I'd love to chat cars.. I've driven a few turbo cars, even DDed a 450hp M3 for a couple months, and I love them. These turbos should spool extremely early, estimating before 2000rpm, but fall off up top in power. I'll make every effort to keep lag to a minimum and spool responsiveness to a maximum.

Looking good Bryson. A lean mean silver bullet machine! Have bushings too, awaiting instructions, date, time... looking forward to it.

Let me just finish cranking out this degree and we can set it up for real (two weeks and I'm done with my Master's!!)

Bryson, looks like you converted to 3 inch wheel studs in the rear. Reasoning?

The wheel studs allow me to try out several different sized spacers without having to buy new lug bolts. Additionally, it makes mounting the wheels much easier (especially the front), as the wheel goes right where it needs to.

[e31yausta]

YOU'VE GOT TO BE KIDDING ME! Is it a lot more stable now? That is freaking nice but does the affect performance?

[Bryson]

YOU'VE GOT TO BE KIDDING ME! Is it a lot more stable now? That is freaking nice but does the affect performance?

More stable? It's always been pretty stable at speed, but it certainly corners faster and with quite a bit more vigor

Do you mean performance as in acceleration? These 315/30/18s are actually the same weight as my 285/35/18s and are slightly smaller in diameter. In theory, the car will accelerate faster due to a slight gearing advantage as well as a lower polar moment of inertia. In reality, there's no discernable difference.