Inner wear on tyres
Discussion
Sorry another thread on tyres
Last week i replaced my rears and they had even wear except for the inner edge which was worn to the wire. I was told this is normal for bmw.
Fast forward to Friday and on my MOT theres an advisory that the fronts are worn on the inner edge, which is frustrating as there is plenty of tread on the rest of the tyre.
Do i need to a re alignment of some sort to try and prevent this? I had a vehicle inspection service and was told i need to replace the left hand diff seal, no idea if that affects this?
Naturally a google search throws up multiple opinions.
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Last week i replaced my rears and they had even wear except for the inner edge which was worn to the wire. I was told this is normal for bmw.
Fast forward to Friday and on my MOT theres an advisory that the fronts are worn on the inner edge, which is frustrating as there is plenty of tread on the rest of the tyre.
Do i need to a re alignment of some sort to try and prevent this? I had a vehicle inspection service and was told i need to replace the left hand diff seal, no idea if that affects this?
Naturally a google search throws up multiple opinions.
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I had something similar...see here...
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
I put it down to under inflation, I've owned the car from new and only ever maintained the same pressures set from the PDI.
I got 26k or so out of my tyres so I wasn't particularly upset.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
I put it down to under inflation, I've owned the car from new and only ever maintained the same pressures set from the PDI.
I got 26k or so out of my tyres so I wasn't particularly upset.
Hasn't it happened on a Z4 I had from new. Even wear both sides but inner 1/3 worn out. Tyre place said it was common to see BMW set up like that, asked me if I wanted to set up to have even wear. I said just stick to manufacturer recommended settings. It was a Z4 35i, my feeling is that it was set up with a little bit more camber for cornering but as we do mostly motorway at the time that made tire wear more on the inside.
Otherwise poor setup from factory. Still had 14k from that set of rears so I wasn't too fussed.
Otherwise poor setup from factory. Still had 14k from that set of rears so I wasn't too fussed.
You running runflats?
This exaggerates the inner wear considerably, without any flex in the side walls, they wear even quicker.
E60s and E90s seemed to be really bad, especially before the facelift, so MY08 on saloon and touring and MY10 was it on the E92 coupe? But around those dates.
By the time the F10s arrived they had sort of sorted it out a bit.
My old man had it bad on his 5GT, after the second set of tyres went through to the cords with over 6mm left across the remaining 3/4 of the tyre he swapped to proper tyres, they wore much better, when he sold the car some 15k miles later they still had a good 4mm across them with the inner edge only very slightly more worn.
But look at the MOT history of BMWs, even back to the E46 and my E83 X3 and it will come up time and time again about the 'excessive inner edge wear'.
Some alter the geometry of the car to try and get rid of it, but often they then say it loses some of its poise, so up to you. If you haven't already put it on proper tyres I would do that first.
Make sure you are also at the top end of your tyre pressures if you're on run flats, this makes a huge difference.
This diagram is obviously not about BMWs, but you can see that when under inflated how the edges wear...
...combined with BMWs aggressive camber and the lack of flex in a run flats sidewall you can easily see why you get that inner edge wear...
This exaggerates the inner wear considerably, without any flex in the side walls, they wear even quicker.
E60s and E90s seemed to be really bad, especially before the facelift, so MY08 on saloon and touring and MY10 was it on the E92 coupe? But around those dates.
By the time the F10s arrived they had sort of sorted it out a bit.
My old man had it bad on his 5GT, after the second set of tyres went through to the cords with over 6mm left across the remaining 3/4 of the tyre he swapped to proper tyres, they wore much better, when he sold the car some 15k miles later they still had a good 4mm across them with the inner edge only very slightly more worn.
But look at the MOT history of BMWs, even back to the E46 and my E83 X3 and it will come up time and time again about the 'excessive inner edge wear'.
Some alter the geometry of the car to try and get rid of it, but often they then say it loses some of its poise, so up to you. If you haven't already put it on proper tyres I would do that first.
Make sure you are also at the top end of your tyre pressures if you're on run flats, this makes a huge difference.
This diagram is obviously not about BMWs, but you can see that when under inflated how the edges wear...
...combined with BMWs aggressive camber and the lack of flex in a run flats sidewall you can easily see why you get that inner edge wear...
Which BMW is it?
IMO it will either be down to bad alignment or poor wishbone rear bushes or a bit of both.
My E46 has a similar wear pattern which seems to be as a result of the alignment going out, then s
t-Fit cocking up the tracking on a front only job and then being realigned by someone decent, abeit expensive (£100!).
Since then, the inner tyres have not worn any worse, and they do seem to be wearing evenly. It's a shame it doesn't drive as straight as I want as a result of it:
IMO it will either be down to bad alignment or poor wishbone rear bushes or a bit of both.
My E46 has a similar wear pattern which seems to be as a result of the alignment going out, then s
t-Fit cocking up the tracking on a front only job and then being realigned by someone decent, abeit expensive (£100!).Since then, the inner tyres have not worn any worse, and they do seem to be wearing evenly. It's a shame it doesn't drive as straight as I want as a result of it:
gizlaroc said:
That's the problem, dial out the wear with geometry changes and it then doesn't feel quite right.
Indeedy!I've had this before when I have bought part worn tyres, where the sellers will talk about the tread the tyre has, but over the tyre as a whole. But then maybe this is why they sold the tyres in the first place.
My now gone Escort RST had some horrendously setup camber on the rear that wore the tyres over very badly on the rear ; it had too much positive camber. It never drove right after I corrected it. 4 new boots later and the car was transformed ; I remember taking the previous owner out in the car at speed he was shocked at how much more planted the car was.
My Clio was the same. On the new Turbine but "Legal" wheels it pulled all over the shop, mainly to the left! New tyres later all was well.
Back to my car I know a set of new front tyres will make it drive right but when the fronts even for Falkens are £300 and £400 for something like a Michelin or Goodyear it does leave you in a predicament. Because of my experience above of "part worns" and other info being omitted like tyre age I am reluctant to spend £200 on part worns knowing I may not necessarily get me a better result.
I await others to say stop being a tight arse and I am risking nuns and kittens lives out there...
Edited by SebringMan on Monday 30th January 14:50
interesting reading above,
To answer some questions :
Yes they're runflats ( i changed the rears last weekend to normal Michelin pss and will do the same to the fronts)
Its the facelift E92.
To be far they have been on the car for roughly 30k miles so can't moan, but does make me question if this a recent occurrence
To answer some questions :
Yes they're runflats ( i changed the rears last weekend to normal Michelin pss and will do the same to the fronts)
Its the facelift E92.
To be far they have been on the car for roughly 30k miles so can't moan, but does make me question if this a recent occurrence
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