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Discussion Starter #1
I know we have had discussions on tyre wear in the past but I'd like to know if most peoples front tyres wear faster on the inside.
Does changing the front suspension arms cure/reduce the problem or is there not a problem anyway for most people :)
 
W

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Discussion Starter #2
Used to get it on the twinny, doesn't seem too bad on the V6 but then I'm running higher pressures.

I'm assured its normal, especially for cars with power steering.

Never had more than about 10k from a set of fronts.

wrinx
 
T

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Discussion Starter #3
I don't believe the power steering thing, why should it scrub tyres on the inner, its just a pump that helps you turn a mechanical mechanism. My 75 has power steering and never scrubs its tyres even at the very last of the 15K miles that I get from a set, I have the tracking set every 5K (fully laden like the manual says..).

My first 16V did 10K on its new front tyres and they were perfectly worn, again I had the tracking set regularly, and there was plenty of tread left after 10K

I would say if it is scrubbing tyres, somethings gone wrong. I've done about 1K miles on a set of Pirellis on the current 16v and so far so good.
 
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Discussion Starter #4
i agree that maybe the track is out or some wear on front suspension. however power steering can increase wear because of the ease which you can turn the steering when the car is stationary causing scrub. In the old days you had to have arms like popeye to turn the wheel on a car with fat tyres when stationary if you did not have power steering so you tended to turn wheel whilst manouvering which makes the steering lighter. Seems power steering has made us lazy parkers. Having said that i get around 20k out of a front set.
 

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mine have always wore even on tread on my twinny with power steering and i give it the ****** round corners quite often . :p
 

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The front and rear tyres always wear on the inside edges :eek:

Put this down to the front wishbone bushes being absolutely buggered eek! but have just got a powerflex kit for the wishbones wink

Just gotta find time to fit them :rolleyes:

As for the rear wearing on inner edge :confused: think thats the norm cant find anything wrong with suspension maybe its just the way i go round corners :p the old jesus handles get some use if anyone is in with me :D
 
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Discussion Starter #7
Front tyres tend to wear the inner edges because 155s seem to run quite a lot of negative camber i.e. if you look at car from the front you can see that the top of the wheels are ever so slighly pointing inwards. The reason for this is that this set-up guarantees greater traction when cornering (just like racing cars); the disadvantage though is uneven tyre wear. Due to the vehicle's suspension geometry, this effect is magnified when you lower the suspension and thus may explain why some experience more wear than others. The rear suspension is an independent trailing-arm set up and has zero camber therefore you should not experience any uneven tyre wear.
Power steering has nothing to do with inner tyre wear or tyre wear at all since the scrub radius (i.e. the point at which the tyres are pivoting about the ground) is designed to be somewhere close the the middle; wear is negligible due to the small distance the tyre runs to either side of this point. If you experienced wear whilst turning your wheels at standstill you would be lucky to get your tyres to last more than 50 miles. Just consider the amount of g you experience when braking hard or cornering at high speeds and then compare this to the marginal effort you are asking the tyres to perform when turning them during a parking manouevre.

T.
 
S

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Discussion Starter #8
I agree with everyrthing TAZ said. Within a year of buying my V6 I had to replace all four tyres purely due to tyre wear, on the outside on the fronts and on the inside on the rears. Had a wheel alignment done when I replaced the tyres, but all they did was transfer the wear at the front to the inside. I took it to a different place six months later and they said that the camber is quite significant, and there is nothing that really can be done, they added that its worse as i have lowered my car 40mm too. One thing though is that he definitely said there's a lot of camber on the rears, unlike TAZ. I've had my wishbones replaced, including with Powerflex bushes back in September or so and I can't say I have noticed too much extra wear so far. Hopefully that's a good sign. Not too sure about the rears though I have to admit.
 
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Discussion Starter #9
Sorry forgot to say pretty much the only recommendation i got was to run the tyres at quite high pressure to promote wear on the middle of the tyre. I'm on about 35 psi. Once wear starts on a certain place, you're screwed as the tyre will favour and run more on the worn part.
I think its just natural for 155s to wear on the inside but I suggest the first thing is to take it to a wheel alignment specialist, they may be able to slow the rate of wear down a bit.
 
M

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Discussion Starter #10
My rear tyres don't wear at all....still look new after 20000 miles, but I replaced them with Toyos. Still got the old ones in my shed.
My fronts wear evenly and got 20000 out of them.
My car is only a skinny, but when sitting next to J77's car, the camber is just as evil on front and back wheels.
I would go with something being out of adjustment. It must a common fault as a lot of you seem to suffer the same problem. I doubt manufacturers would design a car to wear a small part of the tyre quickly. The tyre pressure thing is interesting though....the handbook does give amazingly high figures....

Marlon
 
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Discussion Starter #11
Thanks for that guys.
I think I'll go and get the tracking set again, Will look for a decent specialist in my area.
The wishbones seem fine and the MOT tester said they were not showing signs of wear, but they have now done 65K. :)
 
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Discussion Starter #12
The tyres on mine were wearing evenly in the hands of the previous owner. When I bought it it was about 2 weeks before I lowered it. Its now ( 2months on) pretty much worn out and blistered the inside edges of my Pirelli P6000's on the front eek! but the rears are fine. I did the wishbone bushes at the same time (horrible job, I snapped a couple of bolts :rolleyes: ) as they were worn out at 62k.

Had the tracking checked. The toe in was 2mm instead of 1mm and the negative camber is 1 degree more than it should be at the front because of the lowering bit. Rears were spot on :D I'm not complaining though. Neagtive camber just means faster round the twisties. :D
 
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Discussion Starter #13
My previous set of tyres wore out on the inner edges on the standard springs(Super) The wear rate may be marginally worse on the current Eibachs but not alot. :p
 
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Discussion Starter #14
Get the alignment checked by a specialist, often regular fast fir places let the shop YTS student do it and it gets worse not better. Stand over the guy doing it and ask lots of questions, if they are any good, they will adjust the setup, then roll the car back and forth a few times, them re-fit and re-check it all.

Andy
 
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