Tyres Tyres Tyres!

q96169we said:
Schaef said:
Nanu said:
Thats a good price for the rears. I have seen the same advertised for as much as £60 more each.

Will be needing 2 new rears in about another 1K or so. Will definitely be putting on the Conti 7s from all the good feedback.

Wonder if it will balance the fuel consumption concerns by having the new Conti 7s on the rear and having the Michelins still on the front for another 10k miles thats left on them?
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When my rear tires were worn out I switched to Pirelli. I have had quite a few problems with the tracking system with Michelins at the front and Pirelli tires at the rear. Every bend I took a little faster than normal, the car started to correct the car via the brakes, even though I was not going extremely fast. Very weird. Then I replaced the front tires for Pirelli and then this problem was over. I think it has to do with the sidewall of the tire, where Michelin's are a bit firmer than Pirelli's, which makes the car think that the car is going to break away.

That is my experience with two different brands of tires front and rear.
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I think the main issue is the different front and rear tyre size (assume you have 255 front and 275 rear). The tyre size spec allows some variation even if both tyres are 275/35R19. For example, my G31 rear is same size as G29 but one with p-zero and the other is MPSS. When I put them side by side, visually, the p-zero is much narrower than the MPSS despite both are 275/35R19. Usually, same brand same model of tyre stick to the same variation but different brand or different model of tyre will have different variation. Consequently, if you mix tyres front and rear, the DSC wheel speed sensor will read a value that can make the ECU think it needs to do some correction, as the ECU does not know you've put different tyre on. As the ECU is only callibrated to the star-marked defined tyre size variation, in theory, if your front and rear tyres are different brand but all are star-marked, this issue should go away.
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What you say makes sense in theory, but then tyre wear would cause a similar issue no? The car doesn’t know tyre wear and so it must detect slippage in other ways. I presume using g sensors and other wheel sensors.

The rear end grip I am not getting with my new tyres from cold is significantly better. I can put my foot down and the wheels don’t spin. Previously, accelerating was more challenging. ;)
 
Forgot to mention. You can select other tyre in the idrive so the car knows it’s running different non star marked tyres.
 
Nanu said:
Thanks guys but too technical for my brain. Will wait for Ori to respond.

All I want to know is will I notice anything adverse to having Conti 7s on the rear and used Michelins on the front? When the front ones need changing then will put Conti7s on the front if not.

If there are adverse effects will just replace the rears with like for like
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Thought I responded.
I haven’t noticed any adverse effects on the car. Only positive in terms of grip.
I will replace the fronts when they are due with the conti.

Way too early to comment of tyre wear rate, but argyle Andy will be better placed to confirm or deny.
 
Cheers Ori, that's all I wanted to know.

Whilst the technical input is interesting, its all way beyond philistines like me. I have no doubt before long Andy will give his opinion on wear but as I only do about 6k per year, it's not really an issue but nice to know.

I recall SARS also changed to Contis so she may be able to give some valid opinions also?
 
I haven’t changed tyres yet, still on the original MPSS as they’re only on for 6 months of the year as I run a winter setup between November and April.

After realising that in Germany you can specify 225/45R18 & 255/40R18 on the M40i I’m toying with the idea of the equivalent R19 set up with a change to Goodyear F1A6’s because they’re quieter and supposedly more comfortable that the Conti’s which is more important to me than slightly better cornering performance.
 
My experience is on an E89, obviously, but Conti's are not the way to go if you want longevity.

My rear tyres were changed last September. I think I've done 7,000 miles since, and I will need to change them before August MOT if I want to avoid an advisory.

I could maybe get a legal 10,000 miles out of them if I was happy running them that low, but I think that really defeats the point of spending money on that kind of tyre.

I think the PS4S's got 10-12k miles on the rear, but I may be remembering wrong...
 
sars said:
I haven’t changed tyres yet, still on the original MPSS as they’re only on for 6 months of the year as I run a winter setup between November and April.

After realising that in Germany you can specify 225/45R18 & 255/40R18 on the M40i I’m toying with the idea of the equivalent R19 set up with a change to Goodyear F1A6’s because they’re quieter and supposedly more comfortable that the Conti’s which is more important to me than slightly better cornering performance.
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Thanks, comfort and quiet does appear to be a better option on reflection as I am past the boy racer stage and the car gives all the performance I want with the tyres that are on. So will do some research on the Goodyears unless someone is already running on them chooses to comment?
 
A quick update if that’s what you can call it, on my query re having a different brand of tyres on the rears to those on the front. The simple solution of course would be to stick with the Michelins as already fitted but these are after shopping around, about £40 more expensive per corner than the alternatives under consideration. With A service, MOT and a holiday to pay for cost does come into the equation.

I had the silly notion that if I contacted the experts at BMW, emailing them with the arguments from this thread they would be able to give some clarification and even possibly definitive advice. How wrong I was. The response contained links to BMW products and advised me to contact my local dealership should I want to purchase anything. :headbang: :headbang: :headbang:
 
Nanu said:
A quick update if that’s what you can call it, on my query re having a different brand of tyres on the rears to those on the front. The simple solution of course would be to stick with the Michelins as already fitted but these are after shopping around, about £40 more expensive per corner than the alternatives under consideration. With A service, MOT and a holiday to pay for cost does come into the equation.

I had the silly notion that if I contacted the experts at BMW, emailing them with the arguments from this thread they would be able to give some clarification and even possibly definitive advice. How wrong I was. The response contained links to BMW products and advised me to contact my local dealership should I want to purchase anything. :headbang: :headbang: :headbang:
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Very optimistic of you to think they'd be helpful! I think a lot of people (me included) have had Michelins on one end of a Z4 and Conti's on the other while in transition, with no ill effects.
 
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Very optimistic of you to think they'd be helpful! I think a lot of people (me included) have had Michelins on one end of a Z4 and Conti's on the other while in transition, with no ill effects.

[/quote]I have contacted my local dealership and await their response which I suspect will be stick with the Michelins. I am tempted with the Contis but the wear aspect is off putting and cancels out the saving on price. As I am past the boy racer stage in life, the additional grip is not a feature I prize.

SARs mentions Goodyears so also having a look at any feedback I can find on those.
 

Very optimistic of you to think they'd be helpful! I think a lot of people (me included) have had Michelins on one end of a Z4 and Conti's on the other while in transition, with no ill effects.

[/quote]I have contacted my local dealership and await their response which I suspect will be stick with the Michelins. I am tempted with the Contis but the wear aspect is off putting and cancels out the saving on price. As I am past the boy racer stage in life, the additional grip is not a feature I prize.

SARs mentions Goodyears so also having a look at any feedback I can find on those.
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In that case, maybe better going for something sub-ultra high performance? Michelins PS don't exactly last for ever, and with both your sacrificing quietness, money and longevity in the pursuit of more grip.
 
No bothered about more grip than I already have which is more than sufficient for what I need.

SARs suggests the Goodyears are quieter and are reasonably priced at around £220 each fitted against the best I can find for the Michelins Super Sports now on, £267.

Have told STMBO if she can find a voucher or discount code and bring the Michelins down below £240 I will go for them. She loves a challenge :D
 
[ref]Nanu[/ref], I've just had the Goodyears fitted today, all four tyres fitted for £749 from Protyre in Nailsea. Initial impressions are great, tyres are much quieter and more comfortable than the michelins, see how I get on over the next few days and will report back.

I was asked if I wanted to replace the tyre valves at £10 per wheel, felt like it was a ploy for me to spend more money so declined the offer, thoughts?
 
sars said:
[ref]Nanu[/ref], I've just had the Goodyears fitted today, all four tyres fitted for £749 from Protyre in Nailsea. Initial impressions are great, tyres are much quieter and more comfortable than the michelins, see how I get on over the next few days and will report back.

I was asked if I wanted to replace the tyre valves at £10 per wheel, felt like it was a ploy for me to spend more money so declined the offer, thoughts?
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Thats very much appreciated. I don't have to replace the rears until the MOT which is at the end of next month so look forward to your feedback. At least the weather looks fine for some serious top down driving
 
Just had some feedback from BMW re fitting different makes of tyres on the rest to those on the front.

He stated that as long as they are the correct size and speed rating there is no problems doing so.
 
Well on the Dutch Facebook group in the Netherlands there are several people who have experienced the same thing with the different tires front and rear as what I experienced. So it can go both ways.
 
Schaef said:
Well on the Dutch Facebook group in the Netherlands there are several people who have experienced the same thing with the different tires front and rear as what I experienced. So it can go both ways.
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Perhaps the tyres ideally should be the same size and the same spec re the stiffness of the sidewalls?
 
The specfic issue with MP4SS on the front and almost another other tyre on the rear is the heat up / grip profile is badly mismatched..that set up could vary from chronic understeer to (not in Nani’s hands) chronic oversteer..certainly the stability control system will be earning its keep..
 
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