275/40/18 Indy 500 won't bead all the way - LS1TECH - Camaro and Firebird Forum Discussion

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275/40/18 Indy 500 won't bead all the way

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Old 07-08-2018, 10:59 PM
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Default 275/40/18 Indy 500 won't bead all the way

I was really excited to get my Firestone Indy 500's mounted. No matter how hard we tried, one of the 275 rears wouldn't totally pop onto the bead. I holds air but it's not touching the bead for about 2-3 inches on the wheels circumference even at 50psi. This causes a distortion were the sidewall meets the tread. My buddy who's been mounting tires for 20 years has never seen this. Anybody else ever have this issue? The 245's popped right into place. The other 275 was a little difficult, but the one in question just isn't happening! I've probably had 5-6 different tires mounted on this wheel and never had any issue. It's at 53 psi right now. Gonna let it sit in the sun tomorrow an hope it snaps into place.
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Old 07-09-2018, 07:26 AM
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Kinda wondering if the tire has a busted belt that will cause it to distort
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Old 07-09-2018, 07:41 AM
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Return it and move on
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Old 07-09-2018, 02:32 PM
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Break the bead back down and sprays mixture of dawn dish soap and water in the bead then hit it with the cheetah. There's no way it won't seat.
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Old 07-09-2018, 03:47 PM
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Originally Posted by MY_2K_Z View Post
Break the bead back down and sprays mixture of dawn dish soap and water in the bead then hit it with the cheetah. There's no way it won't seat.
this should do it.
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Old 07-09-2018, 09:26 PM
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I left it inflated to 53lb, and set where I knew it'd get sun all day (low 90's today). It was seated when I got home. It was lubed with some type of tire grease that was painted on with a brush. I did call Firestone, and they said there's no issue with these tires. They did say a 9" wheel was minimum for their 275. I believe the v wheel is a 8.5". Never has been an issue on the other 4-5 275's I've mounted to this wheel.
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Old 07-09-2018, 11:57 PM
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Every now and then I see this issue. Just had a guy roll in the other day with a 5th gen Camaro on factory 21Ē rims and his new Toyo tire wasnít fully seated and he complained of vibration issues. Surprised the shop that installed them didnít notice the damn assembly wobbling all over the balancer. Usually itís due to improper fitment (ie wide tire on too narrow of a rim), other times inadequate lube. Some brand of tires just donít seat as easy as others. I always have to lube the **** out of Falken tires (that have any kind of stiff sidewall) or they wonít seat without some ungodly air pressure.

Just break the bead and re-lube. If you just drove off with it unseated and waited for it to seat itself go have it rebalanced because it sure as hell isnít balanced now.
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Old 07-12-2018, 12:05 AM
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Lots of lube and 100+psi solved all of my tire issues
Biggest problem is with some of the RComps and DR
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Old 07-12-2018, 11:40 AM
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Lots of lube and persistence will solve most every fitment issue you come across.
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Old 07-12-2018, 07:35 PM
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275 tire on what width wheel? Chances are because the tire is too large for the wheel you are mounting on.

CHoose a Proper size tire for your wheel an avoid all of these silly mounting problems, along with the negative characteristics discussed in my link.
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Old 07-13-2018, 03:45 PM
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Originally Posted by kra86 View Post
275 tire on what width wheel? Chances are because the tire is too large for the wheel you are mounting on.

CHoose a Proper size tire for your wheel an avoid all of these silly mounting problems, along with the negative characteristics discussed in my link.
9inch and no a 275 is not to big
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Old 07-14-2018, 08:46 AM
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Originally Posted by actrite80 View Post
9inch and no a 275 is not to big
Not all tires measured at "275" are the same brand vs brand. Indys run fat, well known universally fact. Read the article and learn how to properly match tire size to wheel width.
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Old 07-14-2018, 03:44 PM
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Why would you put a 275 on a stock rim?
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Old 07-14-2018, 04:08 PM
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Originally Posted by 88BlackZ-51 View Post
Why would you put a 275 on a stock rim?
For better looks (subjective), for (perhaps) more straight line grip...all in exchange for a loose, squirrely feel mid-corner.
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Old 07-14-2018, 05:54 PM
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Originally Posted by jmilz28 View Post
For better looks (subjective), for (perhaps) more straight line grip...all in exchange for a loose, squirrely feel mid-corner.

Looks worse in my opinion. The tire bowls and yes loose.
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Old 07-15-2018, 09:47 AM
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Originally Posted by 88BlackZ-51 View Post
Why would you put a 275 on a stock rim?
IMO it looks better. It does hook a little better on acceleration. It was cheaper, $153 for the 275 and $165 for the 245 at the time I bought them. I put a set of rears on every 10,000 miles or pretty much every year. I never noticed looseness mid corner, but it does seem to be more prone to push at the limit. I always heard Nitto's ran small. Never heard that Indy 500's ran wide. I run the car pretty hard and have had rubs on the lip of both the front and rear on the right side, so I hope it's not worse now. My dual mass finally failed at 120,000 miles, so I haven't driven the car with the Indy's yet.

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Old 07-15-2018, 10:59 AM
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Looks like an SUV to me. :

But I am happy that you are happy.
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Old 07-15-2018, 11:06 AM
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Originally Posted by kra86 View Post
Looks like an SUV to me. :

But I am happy that you are happy.
LOL. A little dramatic aren't you? It's only 1.1811", and only 1/2 of that is on the outside.
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Old 07-15-2018, 03:37 PM
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Everyone is a drama queen on the internet.
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Old 07-15-2018, 04:59 PM
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And just like buttholes, we all have our own opinions.
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