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Author Topic: Outside edge tyre wear  (Read 4579 times)

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TheBoy

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Re: Outside edge tyre wear
« Reply #15 on: 26 May 2014, 09:41:55 »

I *think* the outside edge wear is due to driving style. Heavy, high speed cornering (or Milton Keynes' bloody roundabouts) take their toll on the outside edge.

My belief is that this is not toe wear.


Both mine are set to 1.10 - though both have had to deal with 4 months of the local roads around here since setup - and I'm seeing the same, only more extreme, as my outside edge on TBE is now borderline, and the rest of the tyre has plenty (including inner edge). NSF worse than OSF (well, until I swapped them over).

The Bullet is more even between inner and outer shoulder wear, generating the profile of a motorcycle tyre, or as Mr Gixer says, Clown Car tyres.

Seems I need to leave camber as-is on the Bullet, but increase it on TBE, to try to even out the wear. Both are 30mm lowered at the front, on Irmscher springs.


The odd rear wear I suffer on both (centre band) I've reduced with taking the rears down to 28PSI. At about half worn, they get swapped with the front, in order even out wear (fronts wear edges, rears wear centres). Obviously only an option if front and rear are same width.

Not sure front wear could be significantly reduced on pressure. My fronts are normally around 33PSI.
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chrisgixer

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Re: Outside edge tyre wear
« Reply #16 on: 26 May 2014, 10:22:57 »

When was the last time you had geomatry checked?



October. Ish. Iirc.

Not long ago anyway. I'm confident the set up is pretty accurate. Or was, until I did the top mounts yesterday, with the exception of that dodgy idler obviously.
« Last Edit: 26 May 2014, 10:26:00 by chrisgixer »
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henryd

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Re: Outside edge tyre wear
« Reply #17 on: 26 May 2014, 10:30:29 »

Low pressures would help tyre to wear like that,may be worth upping them by 2/3 psi
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Kevin Wood

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Re: Outside edge tyre wear
« Reply #18 on: 26 May 2014, 10:31:51 »

The central tread area looks to be down to the wear indicators to me, so one could argue that that tyre has worn quite evenly, in that all 3 areas of the tyre have become unacceptably worn at about the same time.

If you have both shoulders wearing, it's difficult to see what you could do to improve it, other than perhaps a little more tyre pressure, which might stop it rolling onto the edges as much in hard cornering.
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chrisgixer

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Re: Outside edge tyre wear
« Reply #19 on: 26 May 2014, 10:38:05 »

Low pressures would help tyre to wear like that,may be worth upping them by 2/3 psi

These have been set to 33/4. More than recommended . I have run the previous set at 28. The wear was the same.

I see what you mean Henry, but as the pic, the type of wear although even, is different from one side to the other.

For instance if this was off an old ladiesTunnies car with the same type of wear both sides I'd agree. But this is odd even wear, if that make any sense at all :-[ ;D


Apologies to Tunnie ;D
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Kevin Wood

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Re: Outside edge tyre wear
« Reply #20 on: 26 May 2014, 10:42:03 »

.. but they aren't the original tyre size, and tyre pressures are a guide anyway based on tunnie "average" driving. Some experimentation might be required. ;)
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chrisgixer

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Re: Outside edge tyre wear
« Reply #21 on: 26 May 2014, 10:59:26 »

The central tread area looks to be down to the wear indicators to me, so one could argue that that tyre has worn quite evenly, in that all 3 areas of the tyre have become unacceptably worn at about the same time.

If you have both shoulders wearing, it's difficult to see what you could do to improve it, other than perhaps a little more tyre pressure, which might stop it rolling onto the edges as much in hard cornering.

If like mine, the pic is running off the right edge of the screen, scroll across, and visibly there's actually about 3mm of tread left until the wear indicators.

I tend to agree re camber. As TB mentioned lately, which was very odd for him to mention this particular word I know, that we are in the world of "compromise" (;D ) between cornering wear and straight lune stability, regarding the camber setting. Which like you I dont see where the camber setting can be improved. I'm not sure TB acknowledges the existence of the word compromise, especially when driving, but he did say it. ;D

My only question re set up iregarding the standard Toe Setting is does it need to be decreased for a Poly fronts. Given poly in both wishbone bushes needs a zero toe setting going by Tony's posts a while back. There's is an audible squeal on long sweepers, the volume of which can be adjusted in reverse by the loud pedal.
 Gas it hard mid corner and the squeal is gone. Throttle off, or reduce throttle and it gets louder again.

If toe was less, would that help the squeal, and hence wear on the outer edge...? (Bearing in mind car is in a mid corner attitude. My brain can't visualise it clearly, but any +toe setting would be increased in a corner with an amount of turn on the steering Afaict,  add in cornering forces and the rim pushing the tyre bead outside the tread forcing the outer edge onto the road and moving the inner edge contact patch nearer the middle of the tyre.... I think...? )
« Last Edit: 26 May 2014, 11:01:03 by chrisgixer »
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tunnie

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Re: Outside edge tyre wear
« Reply #22 on: 26 May 2014, 11:15:48 »

I *think* the outside edge wear is due to driving style. Heavy, high speed cornering (or Milton Keynes' bloody roundabouts) take their toll on the outside edge.

 ;D ;D ;D ;D ;D ;D ;D

I must drive faster than you think :)

Photos of the old Goodyear Eagle Ventura's that came off my 2.2 after 45k in my ownership.....









I can't recall what was changed after this, I think a WIM Geo and very possibly some new drop links (GM) but that's it. :)
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tunnie

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Re: Outside edge tyre wear
« Reply #23 on: 26 May 2014, 11:17:45 »

Wonder if I can dig out the toe settings, as mine is not as close to the edge, as Chris's  :-\
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tunnie

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Re: Outside edge tyre wear
« Reply #24 on: 26 May 2014, 11:21:14 »

Found it, tyre photos taken in May '09, WIM Session from September that year...

https://dl.dropboxusercontent.com/u/803897/Omega/WIM/wim.jpg

I don't think I would have done two WIM sessions inside 6 months, so that would be my settings with that wear above. I also think that was my first WIM session, I would have also had the Falkens put on then.
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chrisgixer

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Re: Outside edge tyre wear
« Reply #25 on: 26 May 2014, 11:43:46 »

Found it, tyre photos taken in May '09, WIM Session from September that year...

https://dl.dropboxusercontent.com/u/803897/Omega/WIM/wim.jpg

I don't think I would have done two WIM sessions inside 6 months, so that would be my settings with that wear above. I also think that was my first WIM session, I would have also had the Falkens put on then.

Toe is excessive going by those figures.
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Kevin Wood

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Re: Outside edge tyre wear
« Reply #26 on: 26 May 2014, 11:46:15 »

As I've said before, I don't believe toe will make any odds. Ok, if it's miles out it'll cause the tyres to scrub in a straight line, but that'll be more even wear. The difference between parallel and 10' of toe in isn't relevant unless travelling in a straight line, IMHO, because as soon as you start to turn the Ackerman geometry will produce so much more toe-out that the static toe setting pales into insignificance.

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TheBoy

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Re: Outside edge tyre wear
« Reply #27 on: 26 May 2014, 13:26:16 »

chrisgixer - compromise? Watdatden? Driving is on or off, no room for anything in between (compromise) :P.

As to polys, as I understand, then still have "give" (else we'd put something solid in instead, rather than poly), so I don't think even with fully poly'd, you can have zero toe.


Tunnie - you're plastic tyres don't count. They were so hard, even you could overdrive them, and that wear pattern looks like they have been overdriven. Or maybe your shagged suspension (at the time) hasn't helped ;D.  Was that wear on both fronts, or just one corner - I can't remember?
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chrisgixer

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Re: Outside edge tyre wear
« Reply #29 on: 26 May 2014, 14:10:54 »

Wot 'e said... ;D
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