'Out of Shape' Tyre?

[Welly]

Following up on my wheel-wobble problem we managed to get it up on the MOT ramp at my new best-friends Garage place for a good looky on Saturday.

Bearing in mind, up front, I now have new top mounts, wishbones, ARB drop links and a new inner/outer track rod then all of the front sussy is rock-solid. The drive shafts are solid too.

Upon spinning one of the front wheels and staring like a hawk at the same-spot we saw the tyre would rise and fall very slightly. The MOT man said that, at speed, this 'soft spot' would be exaggerated into a vibration. Anyone had this before? whack these on a balancing machine and they balance fine but the problem appears when loaded-up.

I really need 2 new tyres, the existing ones still have 3.5mm, but I'm skint........AND have TWO long-range Motorway runs to do this month and guess what kinda speed this problem shows up?

Something else; my tyres are 205/50/17's and are fiercely expensive however if I go for 225/45/17's (direct equiv) they are *much* cheaper (like £40.00 per corner ) so this means I'd be up for 4 x tyres and a call to the insewerance for the change in spec. The size change is common on the Old-giffers Forum and apparently the 225/45 is much more common out there on the roads? I will probably go for the new Goodyear Eagle's cos I'm pissed off with wondering if these Kumho's were a mistake on a 220bhp FWD, I don't know whether the constant trying-to-spin the front wheels character of the car has destroyed the tyre structure

[Doggy]

I've had two similar incidents, both manifested themselves on the back, (but the tyres had both done 10-15k on the front first).
One was a Kumho, the previous one a Goodyear Excellence.
I suspect torque rather than power is the issue, only the Kumho 'enjoyed' the remapped 295lb/ft experience, mind you the standard 235 lb/ft is probably as stiff a test as your T5? (but then mine are only skinny 205/60/15 92V's).

It's an interesting question - they have ratings for speed, load, pressure, traction, treadwear, but torque capacity?

Anybody know?

[midsmike]

Try putting your front wheels to the back and the back to the front then see how it feels

[steve_earwig]

Doesn't this just mean the tyre has been carelessly fitted to the rim? Or is that only on motorcycles?

[Bailes1992]

My Dads Volvo used to do this, only to the rear tyres though. He only every had Pirelli PZero Rossos fitted too

[boombang]

Years ago my dad had a car with p-zero nero's on, they repeatedly went out of shape and were huge amounts of money.

Thankfully was a leased car with maintenance included.

I currently have a small vibration and sure it is a tyre out of round. Looking like soon I'll need 3 of them too.

[sirwiggum]

Welly changing his tyre:

[Doggy]

They're fine, so long as you have a compatible steering wheel.........

[sirwiggum]

Vallegvo?

They're coming back in fashion some of these car shows theyre trying to do wacky interiors they had square steering wheels.