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Shocking rear tyre wear

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  • Shocking rear tyre wear

    I have just returned from a 3 day trip around Cornwall in the Coupe and once home, checked the inners of the rear tyres. The previous set were badly worn on the inners and were replaced last July for new Bridgestone Potenza’ I also went to a laser alignment specialist to have the tracking done etc and ensure there was nothing fundamentally wrong with the set up.

    I have done about 350 miles in 3 days and I’d say a maximum of 2,000 miles since last July, but I am shocked at how badly the tyres have worn again on the insides.

    I know rear tyre wear is a common issue, but surely rinsing through a new pair in 2,000 miles, no trackdays, normal driving etc, is a bit quick?

    Does anyone know of any fixes for this? The alignment place I go to did say the rears do camber in quite a lot on the standard set up but I really don’t fancy having to get new tyres every year if I can avoid it.

    Thanks.

  • #2
    The rears are non-adjustable. It can help to replace the rear subframe bushes as they can sag and cause excessive camber, even more so if lowered.

    Otherwise there must be something else out with the geometry!

    Build thread: https://www.z3mcoupe.com/forum/showthread.php?t=19347

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    • #3
      Old post here with some discussion but maybe not a conclusion,


      https://www.z3mcoupe.com/forum/showt...even+tyre+wear

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      • #4
        Inner tyre wear is fairly common to see over the lifespan of the tyre, but shouldn't happen that quickly.

        Any photos?

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        • #5
          Thanks for the responses. I’ll take some pics and post them. Looking at Dave’s post, mine looks very similar to Oli’s tyre wear, the outer edges are almost as new, but the inners are close to being a smooth surface. it’s the rate that has shocked me as they were new in July and they have worn at an alarming rate given the mileage. On my golf diesel I’ve had about 4 sets of Eagle F1’s and I get 15k+ out of those, albeit front wheel drive etc.

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          • #6
            Photo of the inner and outer of the rear tyre, outer is basically as new, almost full tread depth, inner is almost down to smooth on the outer edge. Central area is fine.

            I’m just about to have an oil service and change the power steering pipe in the front grill, and I have bought a few bushes too for the ARB’s, so I think I’ll buy the subframe bushes as suggested by Martin and see if that improves things. If anyone has ever changed all the bushes in one go and has the part numbers, that would be really helpful as I am tempted to change every single one.

            Thanks
            Attached Files

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            • #7
              I have some new BMW bushes. I accidently over-ordered when I did my re-furb.

              Incidentally, I did a little over 4k in my coupe last year with little tyre wear (but a lot of fun)

              Prior to axle refurb my car had done 100k. The diff bush was toast. I did the 'subframe' / beam bushes' and the trailing arm bushes. the RTAB bushes were perfectly serviceable, the beam bushes looked ok, but i replaced everything anyway.

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              • #8
                You definitely have some worn rear suspension/subframe bush parts I would think. I've got a set of Falkens FK453s which I fitted in June 2013 and have done 14,400 miles. Tyre wear is fairly even across the tread width, wife is out with the car at the moment so I can't check tread depth. I will check it later.

                Tyre are slightly oversize also - Fr 235/45 98Y R17 Rr 255/40 98Y R17 and car has done 106,500 miles.

                I had the chassis bushes and rear shock mounts changed back in 2017 and the car has done nearly 4000 miles since then. The car does get driven enthusiastically.
                Pete C

                2000 Z3M Coupe - Cosmos Black Metallic/Black interior. 805 of 821 RHD built

                Previous BMWs

                2003 E46 M3 6 speed manual - Carbon Black/Black interior.
                2000 Z3M Coupe - Cosmos Black Metallic/Black interior. 692 of 821 RHD built
                1986 M635
                1985 E28 M5
                1983 E28 528i Alpina

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                • #9
                  Thanks for the replies. Cosmas you have a PM.

                  Looks as though I need a bush overhaul. I have ordered the ARB ones and have them ready to go on, so I think I’ll do the whole lot, cheaper than new tyres every nine months!

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                  • #10
                    Not sure if you've said, is the car lowered or on stock springs? Obviously lowered will bring some camber and toe and increased wear, but having said that my car even lowederd always wore tyres quite well. It would still show slightly more wear on the inside, but not as much as that.

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                    • #11
                      Completely standard set up and suspension was refreshed under previous owner less than 7,000 ,miles ago.

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                      • #12
                        A late reply to this thread.

                        I overcame this problem by fitting Ireland engineering caster/camber brackets to the subframe to dial out as much rear camber as possible and with minimal rear toe. I also fitted polyurethane subframe bushes and have a butt-strut and the wear on the rear tyres is now very even across the full width even with 285 tyres.

                        Take my advice: don't be tempted to fit polyurethane trailing arm bushes.

                        I think the problem with the OEM rear is there's so much flex and lowering makes the problem worse.
                        /// Exdos ///
                        "Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart

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