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Discussion Starter · #1 ·
I have repalced all 4 tyres on my missus 1996 CSE FPT Auto due to the front tyre shouldes being non-existent. I had the tracking checked with one of those Laser tracking devices and the garage said it was spot on. I noticed that the new nsf tyre was starting to feather again and went back to same garage - tracking still ok. He mentioned that the CSE came with 15" alloys from the Factory and the replacement Aero 16" wheels will wear - sounds like bull**** to me!

Is this a suspension problem?

Last year I replaced the front subframe brackets (all 4 had corroded)

Any ideas?

Or is it the way er indoors takes every roundabout at 60mph anything to do with it

As a aside my wife feels invincible in her Saab and loves the feel of the steering!
 

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I doubt if 16' wheels will wear any differently to 15" but the N/S front definitely wears quicker than the O/S. This is due to the fact that we drive on the left side of the road. This means that the N/S tyres travel farther than the O/S ones because although they are nearer the origin of the curve on a left hand bend they are much further from the origin of the same curve when travelling in the opposite direction. We have loads of roundabouts, all of them of course are right hand bends where the O/S front tyre travels the most distance and is under the greatest load - I'm sure nobody believes a word I'm saying but think about it.
Have you checked the rear wishbone bushes? Sloppy bushes will result in excessive wear on the inboard edges of the front tyres.
 

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I had 16" Super Aero Wheels on my 9000 CSE and my tyres wore OK, the garage is telling you porkie pies I'm afraid.

I took my 9K to a tyre 'specialist' as I could not get Yokohamas anywhere else and they did the laser 3-D balance and track etc. The car felt like I had a wheel missing at 60 MPH so I bit the bullet and took the car to my Saab Dealer who took a look and said it looked like the tracking and balancing had not been touched. I wouldn't have minded so much if I just hadn't paid £40 for the priveledge. Then another £20 from Saab to get it right!

My suggestion is the you take it to your dealer and get the to check the car for you.

Since that experience I have been buying Gislaved tyres from my Saab Dealer and have not had a problem since, with the work or the tyres and I'm running a '94 9000 with 215 BHP (Hirsch chip)


Besides 16" SuperAero wheels were a cost option when my car was new, I do not think Saab would do that if it lead to bad tyre wear.
 

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Discussion Starter · #4 ·
I understand what you are saying about the wear being different from one side to the other.

Funny that you mention the bushes - I have noticed that when I drive the car there is some squeaking/rattling sound coming from the back of the car it reminds me of the sound of a rattley parcel shelf cover like it my old Granada. It quitens down if i close the parcel shelf fully.

How do i inspect the rear bushes?
 

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I meant the rear bushes on the front wishbone. Creaks at the rear could come from any of the bushes in the rear trailing arms or Watt's linkage or the roll bar. Don't think that that would adversely affect front tyre wear though.
 

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sounds as if your a/r bushes are shot (rear)

this would cause excessive roll at the front and probably cause the feathering you describe
(and the rattle...)
the nearside one caused by the roundabouts
(I know this as I work in roundabout town !)
my tyres always go at the edge although not as prounounced as your description
I have maybe 2mm in the middle and the outer edges will be completely bald.....

so I would check em first
replacing them is an easy half hour job unless the bracket breaks (mine did !!)
 

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to inspect

look under car at the back....
the a/r bar is the rear most bar
at either end their is a rubber bush
if there is any gaps or the bush has "squidged" out
they should be replaced

rubber ones are about £6 from ecp
poly ones are about £12 from elkparts
(as far as I remember)
 

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Just wondered, because I've recently replaced a pair of Goodyear Eagle F1 tyres on the front of my 900T.
The shoulders had worn completely bald, yet the centre still had about 5mm of good tread. I always over-inflate my tyres because of the way I drive and the excessive number of roundabouts around my area, so was I disappointed with the wear pattern.
I figured that it may be a quirk of directional tyres, but if it's happened to your Michelin Pilots then perhaps not. Maybe it has more to do with heavy, turbocharged cars and roughly concreted roundabouts.
 

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Discussion Starter · #13 ·
The AVON ZZ1's starting squaling when they hit the tread indicator block's (about 2mm) i think!

They only lasted 9000 miles on the front and i had odd tyres on the back with different tread patterns so i changed all 4. Got a good deal at £85.00 fitted per corner for the michelins!
 

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I don't know for sure for your motor, not being a 9000 owner myself, but my handbook says 32 psi for my 900T without load, up to 39 psi with load or for high speed use. I generally drive alone to/from work, but keep the pressure around 38 as most of my route is motorway or national speed limit.
If you have your pressures low, it could explain the worn shoulders.
 

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Originally posted by RA:
[qb]I don't know for sure for your motor, not being a 9000 owner myself, but my handbook says 32 psi for my 900T without load, up to 39 psi with load or for high speed use. I generally drive alone to/from work, but keep the pressure around 38 as most of my route is motorway or national speed limit.
If you have your pressures low, it could explain the worn shoulders. [/qb][/b]
For the 9000 on standard 16"'s the pressures range from 35psi (1 driver, unloaded, slow - 2.4 bar) up to 45psi (many bobs, loaded >100mph - 3.0bar).

I tend to run mine at about 36 front, 37 rear.

Andrew
 
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