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Discussion Starter · #1 ·
Long post alert!!

I've had plenty of tyre issues on my 240 since buying. When I changed the rears from stock MPSS to PS4 the car was dangerous, as per the thread I made about it. It was weaving around at the back over 50mph and it was difficult to control the car.

So I bit the bullet and ditched the front MPSS with 4mm of tread left and put some more PS4 on. This fixed the issue thank god. The car was then perfect for 11k miles on the PS4 - a joy to drive, very very quick off the line wet or dry and even with just 2mm tread left on the rears the grip was unreal.

However, those rear PS4 wore out recently so I had brand new PS5 fitted instead of PS4. So I currently have new PS5 R and 18 month old PS4 front with 4-5mm tread.

And once again I've had nothing but issues. On the motorway, going over 50mph it was again swaying badly so I thought the pressure may be wrong - they were all over thanks to ATS so I put them to my usual 32F/36R setting and tested them - it was still not right. :(

So I tried more in the rears and put it to 34F and 40R PSI and it was unbelievably dangerous - the car was literally moving at the rear as if it had 4WS and as I hit 50 it was swaying around - I honestly thought it was going to spin!! o_O:cry:

So I tried lowering it all round and put it down to 30psi on all 4. This has cured some of the issues, it no longer sways around over 50mph but I've noticed other problems.

It doesn't have that mega bite from a dry start that it used to have - even in Sport+ if I give it full beans it feels like its bogging down a lot. But not all the time, sometimes its blistering, other times it feels like the torque is being throttled - the PS4 never did this!!!

But worse of all, if I'm in Sport and giving it absolute full chat, say going up a motorway slip road and onto the motorway, any slight steering angle and the traction light is constantly flickering - not just a bit, but constant and it carries on even when I've lifted off and am slowing down. I just had a blast then and with very slight steering angle at something just over 70mph ( :whistle:;) ) it was spongy at the rear and I could see the TC light flashing again, this is in 6th or 7th gear flat out (no cars around).

I honestly don't know what's happened. I've lost confidence in the car now and it feels much worse to drive. But in the current climate I can't really chuck £300 at another front set of tyres.

So, can tyres be faulty and is it worth contacting Michelin to look into it? It's really annoying me now and putting me off driving the thing. I don't really want ATS messing with it again, they buggered up my wheels as it was.

Or is there anything else it could be, wheel sensor, tpms or something else.
 

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Discussion Starter · #4 ·

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Discussion Starter · #5 ·
I assume the tracking is all ok
I'm assuming so, just because the PS4 fitted were fantastic so I can't see how the tracking would go out by just changing the rears.

Not sure where to get tracking/geo done round here though, I prefer specialists but the last guy I used on my old 205 Mi16 track car was a Motorsport Lotus guru and whilst the end result was amazing in the bends and on track, it was very odd on the road and mainly the motorways/DC.
 

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Discussion Starter · #7 ·
Have you got a Kwik-Fit nearby (free check)
My local one does the ones for the upmarket dealers across the road from him (Mercedes and Jaguar)
I'd never use Kwik Fit for tracking or geo tbh, as said I only ever use tried and tested specialists. The lads at Kwik Fit etc don't generally have a clue what they're doing. :whistle:

I should have stuck with BMW instead of ATS for tyres, as ATS is owned by Michelin I assumed they would be OK.
 

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Did you see the comment about my local one
If you own a Merc or Jaguarand go in for tracking you have no idea once you have left, they take the car to Kwik-Fit to get it done
I buy my tyres from wherever is cheapest, they ARE the same tyre
 

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Discussion Starter · #9 ·
Yes, I wouldn't take my car to BMW either for tracking as I know they tend to farm it out as cheap as possible. I normally use the proper motorsport guys as I said, so I may try and find someone to check it over and fix the geo.

I know tyres are the same, but having had 4-5 sets from BMW with no issues, I'm annoyed I went to ATS and now have some issues - not just the tyres, but they scuffed my alloys a bit and the balancing seems not that great.

Just need to find a decent geo company around here now.
 

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Could be balancing, especially as you build speed. My local Kwik-Fit are brilliant!
 

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Discussion Starter · #12 ·
Except you pay a lot more
Years ago BMW wanted £150 for one of my tyres Kwift-Fit were £110 for the same tyre
but your money your choice
No, definitely not, depends on your dealer.

My BMW dealer (Lloyd Colne) have always price matched Black Circles, or any cheaper price I can find from the net once I ask them to. In fact, they often charge me slightly less. The last full set of PS4 they did for me was £476 on Black Circles for 4 tyres, and they did it for £470 fully fitted.

I've had all the tyres on my 240 and on our E91 through BMW, so probably 6-7 sets now. Always price matched to the cheapest online price, plus they often valet the car as well which is a nice bonus. :p
 

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Discussion Starter · #13 ·
Could be balancing, especially as you build speed. My local Kwik-Fit are brilliant!
Don't think it's balancing. It's got the smallest of vibrations at maybe 70 or so, but nothing unexpected.

It's a strange sensation to try and explain, but the whole back of the car sways around more when giving it full beans, but also when braking as well at higher speeds. This is all just on the motorway, driving on normal roads is fine.

It must be the slight differences between PS4 and PS5, I bet if I put PS4 on the R, or some new PS5 on the F it would stop doing it. I can't keep chucking tyres away though.
 

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Is the car bent?

ie have you had it from new with no serious accidents?
 

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Discussion Starter · #15 ·
Is the car bent?

ie have you had it from new with no serious accidents?
Car is almost as new, bought from new by me, garaged and no bumps yet (touch wood). 33k miles all done by me.

It was fine running MPSS all round, then when I mixed MPSS and PS4 it was bad, then fine with PS4 all round and now bad again with PS4/PS5, but still nowhere near as bad as it was with the MPSS/PS4 mix - I can live with this, it's just slightly annoying.
 

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As an aside, I’ve always found BMW dealers to be great for tracking if your car is stock. They’ll make sure it’s properly set up and weighted etc., and their Hunter rigs are kept in good nick/calibration. Only downside is the cost, and some will only work within official specs and tolerances!
 

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Discussion Starter · #17 ·
As an aside, I’ve always found BMW dealers to be great for tracking if your car is stock. They’ll make sure it’s properly set up and weighted etc., and their Hunter rigs are kept in good nick/calibration. Only downside is the cost, and some will only work within official specs and tolerances!
It's due in for a service and brakes soon so I may ask them about it.
 

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I've read other threads (on other forums) about issues with mis-matched Michelins front to rear. It seems to definitely be a thing. Put PS5's on the front and flog the part-worn PS4's. Big market on ebay for part-worns.
 
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Given you know you had issues mixing PS4 rear and MPSS front surely it is reasonable to think PS5 rears and PS4 front may be an issue.

I had similar on my M135 with F1 assy 4 rear MPSS front a while back and more recently when I had to put F1 assy 5 rear to assy 4 front.

It wasn't as bad as your description. I would describe it as "disconnected". The fronts have since been replaced and all is well.

It's a PITA. I always try and match exactly but given the constant changing of tyre ranges it is often not possible.
 

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Any heat from wheels? Take it for a blast and see if you can feel any heat from the discs.
What you're describing is what I had after I had my PS5's fitted. Purely coincidental mind.
I had sticking caliper, at speed 60mph+ a fair bit of wobble at speed and dragging which was due to the rear left brake not disengaging.
Replaced calipers and back to normal.
 
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