RFT to Non-RFT tire pressures?

My plan was to change to Michelin Pilot sports this year but the car won’t be getting its usual usage due to the travel restrictions. It seemed pointless to fit new rubber for a few local runs then have it sit on them in the garage over winter.

Just got to hope for better things in the spring of 2021 :thumbsup:
 
Spend the money now Ron...the trip to the newsagent will be so much smoother and nicer..way to go Grandad :driving: :rofl: :thumbsup:
 
Pbondar said:
Spend the money now Ron...the trip to the newsagent will be so much smoother and nicer..way to go Grandad :driving: :rofl: :thumbsup:
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Laugh you might :D but granddaughter No 1 loves the Z4
It’s going to be a problem now No 2 sees the car and also wants a ride out !
 
ronk said:
Pbondar said:
Spend the money now Ron...the trip to the newsagent will be so much smoother and nicer..way to go Grandad :driving: :rofl: :thumbsup:
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Laugh you might :D but granddaughter No 1 loves the Z4
It’s going to be a problem now No 2 sees the car and also wants a ride out !
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But of course...the ‘yoof’ are very discerning and I’m sure she’ll perceive the benefits of the Michelin’s! :thumbsup:
 
Well, after playing with several different combinations of air pressure, I can honestly say switching to non run flats was a mistake for me. However, to each his own. Loosing that steering response was a game changer for me. While the ride is great, I no longer feel like I'm in a sports car. :(
 
javis20 said:
Well, after playing with several different combinations of air pressure, I can honestly say switching to non run flats was a mistake for me. However, to each his own. Loosing that steering response was a game changer for me. While the ride is great, I no longer feel like I'm in a sports car. :(
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Not sure it’s a fair comparison..comparing a pure summer tyre with an all season tyre is bound to IMHO less to some areas of disappointment even if one was RFT and one was not..? The
 
javis20 said:
Well, after playing with several different combinations of air pressure, I can honestly say switching to non run flats was a mistake for me. However, to each his own. Loosing that steering response was a game changer for me. While the ride is great, I no longer feel like I'm in a sports car. :(
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Could it maybe because you’ve gone to an All Seasons tyre?
My 335xd (M sport suspension) feels quite sharp on its summer / standard rubber but quite “squishy” on its winter rubber.
(Ive just see there’s a post suggesting something similar !)
 
Granted pure summers are better than ultra performance all seasons, but we are not talking about a small performance difference. My previous tire was an all season run flat tire (Potenza RE960AS RFT's). If I had it to do over I would have replaced with RE960AS RFT's.
 
Go back to the suppliers ASAP - if the car feels as bad as you say (and I’m not doubting you) then it’s maybe a defective tyre ?
The fitting of non runflats is generally accepted as being a very positive improvement.
 
As ronk suggests seems like something is not right..every tyre / wheel combo I’ve used including some cheap Chinese tyres handled better for me on my E89 N20 with whatever tyre pressures..

I’m not aware of any individual who perceived the move from OE runflats to another tyre as a negative event..
 
Pbondar said:
I’m not aware of any individual who perceived the move from OE runflats to another tyre as a negative event..
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I posted earlier that a previous E85 didn’t “turn in“ quite as sharply but overall there was a great improvement and I would have refitted the same tyres again.

Something is wrong!

Can you describe how the car feels and behaves rather than a generic term- it might help pin down the problem. :thumbsup:
 
Googling shows a number of customers with specific issues with these tyres, steering and losing tread blocks being the more common..
 
The car handles great with these tires. Already had them over 100 mph and the ride and handling is an improvement. My complaint is steering is not as quick and aggressive as the rft's. Basically because of the lack of the thick sidewalls. There is nothing wrong with the tires, just not my cup of tea. My guess is the steering response was tuned for rft's. Anyway, I got 60 days to return these if need be. Going to live with them a while longer since the improvements out number negatives.
 
javis20 said:
The car handles great with these tires. Already had them over 100 mph and the ride and handling is an improvement. My complaint is steering is not as quick and aggressive as the rft's. Basically because of the lack of the thick sidewalls. There is nothing wrong with the tires, just not my cup of tea. My guess is the steering response was tuned for rft's. Anyway, I got 60 days to return these if need be. Going to live with them a while longer since the improvements out number negatives.
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Well like most things, a search for perfection will result in some disappointments.. :thumbsup:
 
javis20 said:
The car handles great with these tires. Already had them over 100 mph and the ride and handling is an improvement. My complaint is steering is not as quick and aggressive as the rft's. Basically because of the lack of the thick sidewalls. There is nothing wrong with the tires, just not my cup of tea. My guess is the steering response was tuned for rft's. Anyway, I got 60 days to return these if need be. Going to live with them a while longer since the improvements out number negatives.
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From what you say above, it would seem that your experience is the same as mine - the steering feel is “delayed “ until the sidewalls tighten.
I would think the all seasons tread pattern and softer rubber will exacerbate this feel.
 
Hope I don't have to eat crow.. I just drove 52 miles this morning and steering response has significantly improved. Lets see what happens.
 
Pressures? 30 is a nice number, but then so is 32. 28 is as well, although 34 has its merits, apparently. Mind you, 36 is so pretty.

Alternatively, you could just look as the helpful little label that BMW's put near the bottom of the B pillar.
 
Busterboo said:
Alternatively, you could just look as the helpful little label that BMW's put near the bottom of the B pillar.
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But those figures only refer to stiff walled run flats - The tyre manufacturers pressure settings are the best starting points. They know how their products should work.
 
Busterboo said:
Pressures? 30 is a nice number, but then so is 32. 28 is as well, although 34 has its merits, apparently. Mind you, 36 is so pretty.

Alternatively, you could just look as the helpful little label that BMW's put near the bottom of the B pillar.
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Lost my bet with myself! Two days later than I guessed. :D
 
enuff_zed said:
Busterboo said:
Pressures? 30 is a nice number, but then so is 32. 28 is as well, although 34 has its merits, apparently. Mind you, 36 is so pretty.

Alternatively, you could just look as the helpful little label that BMW's put near the bottom of the B pillar.
Click to expand...

Lost my bet with myself! Two days later than I guessed. :D
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Surprised it took that long..although my run flat tyre pressures are drifting upwards..
 
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