Cupped Tires = Alignment Problem

[Steve@Tasca]

I just think it's odd that two different Foci had the exact same issue with the F1's on cars with decent alignment.

[oldoutboardjim]

I'm no expert on alignment, and how much misalignment is necessary to cause tire problems. I can tell you this: The F1's were so loud (even at <15MPH) that I was seriously thinking of getting a car that isn't so blasted loud! One of the F1's is worn out (inside), one has some cupping (inside) but is still okay, and two are still good (~50% tread).

[Patalrob]

My F1's did the same thing, all 4 corners did it. I'm kinda bummed about it since they were a pretty nice tire for hard driving..

[o2designs]

This is not the first time I've heard these issues with F1's....I just stay away from GoodYear...

[focinite]

Going on what you said in your first post, that your alignment was only out a degree. A degree out in toe, camber, or caster is a lot. That would have caused a significant problem with your tires. I have the FRPP spring and strut kit which basiclly does a 4" body drop in the rear and that only changed my camber by 1 degree. Without actually looking at your tires I can't tell you what caused your cupping, however that alignment being that far out would definately cause it.

get a pro tactor and look at how big a degree is, i know as it gets farthe from the adjustment point it will grow larger but in most cases 1 degree in caster,camber,toe is not huge. look at the twin I beam setups, they want almost a full degree of caster split.