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