Anyone running 305/35/20s on the track on all four corners?

[CrystalRedTintcoat]

I'm just curious if this size will fit on the 10" wide front wheels and not be dangerous at high speed track driving and cornering. If safe, what cold temp / lap hot temp should they be set at?


-CRT

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[Camaro Dude]

I'll bump this up for you

The Ligenfelter L28 uses a 305-35-20 square setup, on 20in Forgestars, full description here http://www.thelingenfeltercollection...challenge-car/

[Orange Crush 1LE]

I'd do it, I bet that wide rubber improves grip.

[CrystalRedTintcoat]

Dude, thanks. Helpful.
Todd, my post is in direct response to your recommendation. I want to make sure it'll fit on the 10" rims.

[BruHop]

When someone has experience with this, please post up. Would this be a good AutoX setup?

[Camaro Dude]

Originally Posted by CrystalRedTintcoat

Dude, thanks. Helpful.
Todd, my post is in direct response to your recommendation. I want to make sure it'll fit on the 10" rims.

I remember reading from Justice Pete, that the L28 had slight rubbing issues on the inside part of the front wheel well, but I read this long ago, I forget the specifics as to where it rubbed exactly.

As for the 10in aspect part of the question, if I were in your shoes, I'd simply ask myself, what size wheel width does the ZL1 use on it's 305mm rear, and why .

I would milk out the research on the latter.

[CrystalRedTintcoat]

Problem is that there aren't a lot of 305/35/20 tires out there. Goodyear has F1 G2s for $280 in that size. I'd prefer NT01s but they skip from 285/35/20 to 315/35/20.

Got a good deal on 20" CCW wheels so I'm staying at 20".

[X25]

In our experience on Miatas, the wider rubber simply bubbled up, and the tire track that touched the ground did not increase substantially, when compared against the tire that correctly fits the wheel diameter.

Would it work? It's just one step off recommended range, so it should fit, but I doubt it would give you the improved traction you're looking for. Your fronts might also heat up faster due to more sidewall flex, if you're concerned about that.

Forgeline wheels referred to are 10.5" wide, and that 0.5" difference will help and directly translate into 0.5" extra tire track width, since tire is already compressed up front. The benefit will substantially decrease as you get to max recommended width (11.5"?).

[L99CAMA2011]

This is one of the worst setups for track use. Great for reducing steering feel and making the front end feel sloppier.

[Camaro Dude]

Originally Posted by L99CAMA2011

This is one of the worst setups for track use. Great for reducing steering feel and making the front end feel sloppier.

Did you mean even if on 10.5 width rims?

If so, it's worth reiterating the L28 on 305/35/20 and 10.5 width mags, whipped everyone's asses handling wise during its wars on the track, if we turn a blind eye to the rubbing issue on the front inner fender lining that is .

Unless you meant simply slapping on the 305/35/20 on a stock 1LE suspension, and stock mags, in which case yes, that would be bloody aweful, agreed.

[CrystalRedTintcoat]

Originally Posted by L99CAMA2011

This is one of the worst setups for track use. Great for reducing steering feel and making the front end feel sloppier.

So, stay with the 285s for track then?


-CRT

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[CrystalRedTintcoat]

Gents:

Is this an issue of Measured Rim Width vs. Approved Rim Width?

285/35/20 | Measured Rim Width = 10" | Approved Rim Width = 9.5 to 11"
305/35/20 | Measured Rim Width = 11" | Approved Rim Width = 10 to 12"

Where "The measured rim width range is the range the manufacturer recommends for what width wheel the tire would fit. For Example 195/50R15 has a recommend width range for most tires of 5.5 to 7 inches. This means that size will work fine on any wheel within that range 5.5,6,6.5 or 7. The narrower the wheel the more tucked in the sidewall will be. The wider the wheel will push the sidewall out more."

So, is the tucking in the softer sidewall issue?

[X25]

Originally Posted by CrystalRedTintcoat

Gents:

Is this an issue of Measured Rim Width vs. Approved Rim Width?

285/35/20 | Measured Rim Width = 10" | Approved Rim Width = 9.5 to 11"
305/35/20 | Measured Rim Width = 11" | Approved Rim Width = 10 to 12"

Where "The measured rim width range is the range the manufacturer recommends for what width wheel the tire would fit. For Example 195/50R15 has a recommend width range for most tires of 5.5 to 7 inches. This means that size will work fine on any wheel within that range 5.5,6,6.5 or 7. The narrower the wheel the more tucked in the sidewall will be. The wider the wheel will push the sidewall out more."

So, is the tucking in the softer sidewall issue?

He intends to mount outside the recommended range, 10" where the recommended range is 10.5"-11.5" for most tires in that size.

By the way, it's not called "measured rim range", but rather just "recommended/approved rim range". Measured width just means the size of wheel used to take the measurements like thread width, etc. for the tire specs.

[Camaro Dude]

Originally Posted by CrystalRedTintcoat

.....The narrower the wheel the more tucked in the sidewall will be. The wider the wheel will push the sidewall out more."

So, is the tucking in the softer sidewall issue?

Yes, and very much so on these big heavy cars.

The 1LE with its almost square set-up, with wider mags in the rear than the front, but 285's all around nonetheless, and calibrated sway bar size was done all for good reason. Point being, that "stretched" rear tire did make a difference as far as meeting the engineers target goals went.