Wavy "sine wave" tyre wear - Alfa Romeo Forum
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(Post Link) post #1 of 3 Old 07-09-08 Thread Starter
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Wavy "sine wave" tyre wear

Can anyone confirm the correct angles and tolerance for the following 4-wheel alignment on a 1998 Spider 2ltr TS?

~ Front: Individual Toe, & Total Toe

~ Rear: Individual Toe, & Total Toe

~ Rear Camber

From experience and earlier threads it appears that the Spider design set-up tends to naturally punish the inner side of the tyres first, more so at the front.

However, my rear tyres (Eagle F1 GSD3 all round) have badly worn and the road noise and vibration have increased when just swapping these rear tyres to front this week. Found heavy, but unusual "sine wave" wear only on inner side of tread all around the circumference. Centre and outer tread still well ok. - Now like driving on cobbled road. Problem was not so obvious during driving when these tyres were on the rear. - Initial though it was wheel bearings going.

Difficult to see how both the rear tyres could wear in this local one sided "up and down" wavey profile. Must be some combined rear camber/toe misalignment causing it?

I think my rear alignment maybe out from being "backended" sometime back prior to fitting new F1s all around, - but body jig checks and insurance repair did not suggest problems in this area.
Recent wheel alignment checks suggest about "-2 degrees camber" at rear.

CDs, manuals, alignment shops all seem to vary with the stated required angles and the capability of readjustment at the back.

Cannot see any obvious way to readjust rear camber.

Will be replacing tyres, but want to get alignment sorted first. (Apparently the F1 directional tyres are being phased out for asymmetrics!)

Anyone had a similar problem &/or know the correct rear set-up angles??
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Re: Wavy "sine wave" tyre wear

Its common for F1s to do this on our cars for some reason. I've had it twice, thought it must be either worn bushes, dampers or misalignment. Just had the latter checked and the garage said it is always a symptom of worn dampers. Indeed, the one on the side its happening is leaking.

Still puzzling as to why it only seems to be F1 shod cars that suffer.

The alignment figures are in the handbook.
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(Post Link) post #3 of 3 Old 07-09-08 Thread Starter
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Re: Wavy "sine wave" tyre wear

Thanks SimonT. Yes I have been told that the directional tyres were more prone to this for some reason. I like the Eagles F1's, but to save wiping a a set of tyres again in <15k miles for the same reason, looking at the asymmetic Pirelli P-Zero Neros.

Not sure that its the shockers on mine, the local Alfa Specialist garage checked them out on the service last week.

By the way I still cannot find all the alignment details in the handbook (Doc Ref H/B N.60490862). I must have a different one. I am still looking for confirmation on the values the Front Toe & Rear Camber angles.
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sine wave , tyre , wavy , wear

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