Tire failure. Again

[backformore]

You may recall a few years ago I had tire delaminate on my SSC 2000 Civic Si which led to a vibration. It was an old Hankook and I had some possible caliper issues so I attributed it to those factors.

Fast forward to last Sunday. The car is now IT prepped, 350 lbs lighter, 800frt/1000Rr springs on Koni race yellows, -3.25 frt/-2.0 rear camber. Tires are 2 year old Toyo RA1s at 42psi hot,

Left front tire did exactly the same as previous failure. After turn 7 at Rd Atl I picked up the vibration. Inspection revealed deformed tread and steel fibers pushing through the inner sidewall.

Has anyone seen this before? Since I've seen it twice I'm a little concerned.

Thanks for any insight.

Rory

[joeg]

not on a Hankook; saw one a couple weeks ago on a BFG tire.

[Terry Hanushek]

Joe

not on a Hankook; saw one a couple weeks ago on a BFG tire.

From above: Tires are 2 year old Toyo RA1s at 42psi hot,

T

[Chip42]

One of our MR2s had a similar failure at Roebling back in July - Hankook DOTR (C71?). it happens - banging curbs and stuff makes it more likely - it's often the result of a trauma to the tire that shows a long time later. your hot pressures seemed a little high, that isn't going to help it either. too-low pressures would have different but similarly bad failure modes.

[backformore]

Toyo recommends hi 30 to low 40 hot pressures. My old data shows we ran 37-38 on the Miatas. I figured with the high loads of front tires on the Civic they would like even more on the high side.

Any thoughts? Anyone running RA1 on Honda with different numbers?

Didn't have opportunity to get tire temps. Really wish I had now.

[mossaidis]

on my 2300 lbs Civic EG, I would run toyo's between 37-39 hot. That was back in 2006-09.

[madrabbit15]

42lbs Hot "might" be okay on the front of a FWD car, but it certainly would not be anywhere close to fast or optimal. I wouldn't trust it. You don't want to see any more than 37-38 lbs hot on any tire, toyo, kumho, hoosier. Some of the manufacturers are more forgiving than others so you might be able to get away with it but doesn't mean you should.

[Flyinglizard]

42 is not out of range. Check for at least 1 in of clearance between the tie rod end /strut etc for rubs.
1in may seem like a lot but I now paint(chevy orange) the outer ends of my suspension.( to watch for rubs. )

[ShelbyRacer]

Hankooks had tread separation instances when they were run counter-recommended-rotation.

Had the Toyos ever experienced extreme cold during their life (As in less than 15*F)?

[mossaidis]

The thread also reminded me that I had a toyo seperate from the bead once. Front left at Limerock going down the straight away after a day of dual driving. It was 1 of 20 Toyos where I didn't have any issues with them.

42lbs Hot "might" be okay on the front of a FWD car, but it certainly would not be anywhere close to fast or optimal. I wouldn't trust it. You don't want to see any more than 37-38 lbs hot on any tire, toyo, kumho, hoosier. Some of the manufacturers are more forgiving than others so you might be able to get away with it but doesn't mean you should.

My fastest times on my FWD Honda Civic with a 225/45R15 at 2290 lbs is 40 lbs hot with Hoosiers. You might not trust it, but the timing clock has different intentions and my placement says otherwise. Much about pressures has also to do with car setup as well.

[T Broring]

You may recall a few years ago I had tire delaminate on my SSC 2000 Civic Si which led to a vibration.....

Fast forward to last Sunday..... Tires are 2 year old Toyo RA1s at 42psi hot, Left front tire did exactly the same as previous failure. After turn 7 at Rd Atl I picked up the vibration. Inspection revealed deformed tread and steel fibers pushing through the inner sidewall. Rory

Have seen wheel bearings that are failing cause vibrations due to the rotor leaning on the pad causing heat buildup. When cool the rotor may return to non-warped condition. Wheel bearing can also affect tire wear. I recommend checking the wheel bearing with pads retracted away from rotor (or removed) and if possible axle removed from outside hub. You will thrn be able to tell if the bearing have roughness or looseness.