03-17-2018, 07:07 PM | #1 |
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Pirelli (PZ4) Run flat - Tramlining
Hi all,
I’ve got a 2013 X3 30D Msport with 19inch staggered setup that came factory fitted with the original Pirelli P Zero run flat tires. Due to puncture I had to replace both front tires and have chosen to go with the new P Zero (PZ4) whilst rears are at 30% thread left on original P Zero. Ever since the tire change I’ve experienced extensive tramlining issues on uneven road surfaces/while changing lane going over road marker lines. I’ve had alsignment checked and re aligned multiple times at bmw with no luck of rectifying the issue. BMW has also since replaced the steering rack to the latest version as well as replaced both front struts but car still tramlines a lot. Car seems to run very smoothly and doesn’t pull on flat roads. Tramlining/instability is more evident in the wet also... Could this be caused by running different treat patterns front (new pattern) and rear (old pattern) and/or worn tires in the rear? Would you guys recommend changing out the rears to new PZ4 also so the front and rear matches? Tire shop and bmw said as long as I have same pattern on either axle then it shouldn’t cause any issues though... Also what tires do your 19inch M sport staggered setup come factory fitted with? Any other run flat you guys recommend switching to? |
03-17-2018, 08:34 PM | #2 |
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Strange. I think there's an inside edge and an outside edge, did they get switched? Any chance they are directional tires but running backwards?
Try a different alignment shop, just in case the same person did the same incorrect alignment at the dealer? I am doubting this one and it'll cost but is an idea. Any chance to get a different set of wheels / tires put on for a few hours to see if it goes away and help narrow it down? I would say too that if the tires you have are indeed "high performance" as claimed, and may be, the softer compound might alone be the culprit. Maybe there's not an issue at all, it's just grippy tires doing what grippy tires are prone to doing? I just bought mine CPO, it has Bridgestone Potenza Re960's on it. I haven't noticed any issues. |
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03-18-2018, 10:31 AM | #3 |
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I would not mix RFT/non-RFT:s. Without real knowledge, I would recommend going for new rear tyres.
Tramlining started with new setup - normal procedure is to go for 100% no RFT. |
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03-18-2018, 04:26 PM | #4 | |
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Front replacement tires are the new version P Zero run flat that replaced the original hence are both high performance tires. Which makes me wonder whether the different tread pattern/tread depth contributes to the Tramlining.... |
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03-19-2018, 03:03 PM | #5 |
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I’ve got the same setup and have the same problem but I haven’t changed the front tires and have changed the rears but it was happening prior to that. Although not sure exactly when it started happening. Have always kept with p zeros and they have been fine before but did not realise there were different versions. Was planning on getting new fronts in a couple of months as on about 3mm at the mo and hoping that inproves things.
The tramlining reminds me of my focus rs mk2 which fidgeted on bumpy roads and when going over cats eyes. |
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03-20-2018, 04:57 AM | #6 | |
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I just find it really strange that the car drove perfectly with no Tramlining at all for the first 3 years till now with new version p zero and having new steering rack fitted. BMW service manager said it might be a result of new rack version which changes the steering feel... |
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03-20-2018, 03:02 PM | #7 |
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The Focus was a 300bhp FWD car that torque steered like a pig. I just put it down to the diff / revoknuckle setup.
My X3 has been fine for 2.5 years and nothing really changed to initiate the tramlining like a tyre change. I thought maybe it was to do with new tyres on the rears giving a big tread difference rears vs fronts (7mm vs 3mm) but am pretty sure it happened well before the new rears went on. |
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03-20-2018, 03:04 PM | #8 | |
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03-20-2018, 03:19 PM | #9 |
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Are you sure that is a tire problem?
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03-20-2018, 10:51 PM | #10 |
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The tread pattern on the new P zero PZ4 is different to the original pattern. If you check Pirelli website you’ll see the difference.
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03-20-2018, 10:55 PM | #11 |
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I’ve had alignments check and redone at dealer as well as tire shop. Had steering rack replaced as well as both front shocks replaced. Had suspension and steering components checked for loose/worn joins at a specialist suspension shop but every thing came back ok. Which makes me think it’s the tires...
What other factors/components would you suggest that might’ve contributed to Tramlining? |
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03-21-2018, 09:56 PM | #12 |
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I had a similar problem as you and knew my suspension was ok, it was basically the RFT tires. My tram lining went away after tire replacement with non rfts. Something about the construction of the tire which doesn't allow it to deflect enough which causes it to just wander over surface irregularities. You can try to reduce the tire pressure by 3psi to see if it helps..
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03-22-2018, 05:53 AM | #13 |
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I have only ever used RFT and never seen the issue before. I tried lowering my front tyre pressure and made no difference. Think I dropped 2psi as did not want to affect wear rate too much.
Its a quandry as changing to non rft would mean all 4 and ebat part of £900. Gonna replace fronts in next 2 months with same p zero and see what happens. If no change will speak with local bmw indy specialist for ideas. |
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03-23-2018, 02:49 PM | #14 | |
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I can't think of anything other than what you've had checked unless you are dealing with very unusual road conditions.
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03-25-2018, 07:15 AM | #15 |
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try the new tires on the front, if it goes away then it's the tires. it is recommended by some to put the best tread tires on the rear to avoid oversteer when braking and cornering.
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03-27-2018, 05:28 AM | #16 | |
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I cant see how its RFT as its all I have ever had fitted in the 3 yrs I have owned the car and no issues before. |
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03-29-2018, 11:04 PM | #17 | |
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Not sure if changing out all 4 tires to Bridgestone RFT will help... Any one know what tires come factory fitted on G01 X3 M Sport? |
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04-14-2018, 06:42 AM | #18 |
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Quick update.
Tramlining has been fixed after I replaced all 4 rims and tires. I managed to get a set of brand new wheels and tires off a 2017 X3 M sport that came fitted with P Zero run flat with original tread pattern (not the new PZ4). Tramlining issue completely went away after I replaced the wheels and tires. |
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04-16-2018, 04:35 AM | #21 |
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I have been banging on for years about how different tyres front and rear 'can' cause all sorts of issues on BMWs.
On the RWD the traction light comes on a lot with mixed tyres, that shows you just how much traction you are losing. You can also be fine, but why risk it on 'The Ultimate Driving Machine'? Just get 4 that match and know your car is right. If you start mixing and matching tyres you may as well have bought an Audi or a Prius. |
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04-16-2018, 05:30 AM | #22 | |
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