Winter tyre pressures 18's

L

Limmys10

Member
 England
Hi all,

Just fitted Winter tyres to my 35i 225 40 18 and 255 35 18's. Non-run flats.

Just wondering what kind of pressure I should be using, I've heard less than run flats, even less with winter tyres but nothing conclusive.

Any ideas?

thanks
 
Same as normal, it's the width that dictates pressure primarily so you are getting good contact in the centre of the tread. The outside of the tread is limited because its fixed to the wall so you need the right pressure to force the centre down for equal contact.
Hence tyres at low pressure wear wear on the outsides and tyres over inflated wear in the middle.
 
Just out of curiosity, Limmys10, where in England do you live that you need winter tyres?

And when you say "just fitted", presumably that means you have only one set of rims, does it?
 
Busterboo said:
Just out of curiosity, Limmys10, where in England do you live that you need winter tyres?

And when you say "just fitted", presumably that means you have only one set of rims, does it?
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Don't know about the op, but it has been icy here (North Devon) this week, couple of mornings I've had to de-ice and the temp has rarely been above 3 or 4. Winter tyres are effective under 7 degrees I think.

Had them for my 1'er but not the Z4. Last year I got stuck on a hill in a freak hailstorm that compacted to ice - had to stop as the car in front did, then couldn't move as I just span the wheels. About 10 cars stuck, causing nice tailbacks in both directions. Even the Police car couldn't get through, surprisingly a 2wd Volvo estate...I'd have thought in a rural area they would all have 4wd.
 
We had icy mornings 3 or 4 days running here in Berkshire earlier this week and temperatures stayed in single figures all day, so if I was using a Z4 every day I'd definitely put winter tyres on it.

Luckily my Z4 doesn't have to go out when the weather is like that, so I only fit winters to my 3 Series! I just run them at the pressure specified on the sticker inside the driver's door.
 
Winter tyres are as ineffective on ice as a summer tyre, unless they are studded.
If they are treaded for snow and you ever find you actually need them then you should aim to keep your tyres in fresh snow as the tyre compacts it into the tread to gain grip, tip from my brother uses these 'snow type' tyres abroad every year :thumbsup:
Aa for more effective below 7deg C, I am pretty sure that my tyres always run over 7 deg C once driven for a while anyway.
 
Depends where you live and how often you drive and how you drive..for example here is the Scottish Borders it’s officially cold and wet as far as winter tyres are concerned for 5 months of the year..so for those 5 months you will be better off on pure winter tyres vs pure summer tyres..

The other issue is that in normal traffic conditions the summer tyres never acquire enough heat to work, period, and if you can work them hard it takes 5-10 miles min to get to temp...round here if you tried to follow a winter tyred car you would be off at one of the many corners..

Also if you do run into sleet/slush/frost or standing water not to mention snow of any kind the winter tyres rule...
 

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I'm in south east Kent, i have snow socks in the boot of the Z4 just in case we get freak weather.

Couple of years ago we had an ice storm in the middle of the afternoon, i was the last to leave the office.
We have some seriously step hills to get back into Folkestone and Hythe. I had numerous cars turning around at the top of one.
I got down no issue in the Z3 8)

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Pbondar said:
Depends where you live and how often you drive and how you drive..for example here is the Scottish Borders it’s officially cold and wet as far as winter tyres are concerned for 5 months of the year..so for those 5 months you will be better off on pure winter tyres vs pure summer tyres..

The other issue is that in normal traffic conditions the summer tyres never acquire enough heat to work, period, and if you can work them hard it takes 5-10 miles min to get to temp...round here if you tried to follow a winter tyred car you would be off at one of the many corners..

Also if you do run into sleet/slush/frost or standing water not to mention snow of any kind the winter tyres rule...
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Informative statistics in the chart in your post. If I lived in the Scottish Borders, I wouldn't have sold my AWD 911.
 
N4LLY said:
I'm in south east Kent, i have snow socks in the boot of the Z4 just in case we get freak weather.

Couple of years ago we had an ice storm in the middle of the afternoon, i was the last to leave the office.
We have some seriously step hills to get back into Folkestone and Hythe. I had numerous cars turning around at the top of one.
I got down no issue in the Z3 8)

20180302_155201.jpg
Click to expand...
What are snow socks? Do they give more grip so you can push it :poke: :D
 
[/quote]What are snow socks? Do they give more grip so you can push it :poke: :D
[/quote]

Silly boy. :rofl:
 
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