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[Debs.]

As long as it's not the one with the cardboard boot floor eh..

I`d bought and driven home from the scrapyard with a 100 kg. blacksmith`s anvil, before I realised the pup-mobile`s load floor was made only from cardboard and fluff.....the spare wheel prevented a near-total collapse.

[Del Boy]

my m3 was brilliant in the snow so are you sure its not the driver thats the problem instead of the car?

Yes I'm quite sure it's not the driver, I'm not talking about my M3 either Mercedes E classes are loads better than my beemer.

[jonnycool]

More to do with the width of the tyres on BMW's imo, they're usually quite wide compared to other marques which doesn't help in snow.  When my rear tyre blew out recently, I had more grip with the spare wheel on the back which had a much smaller contact patch to cut through the snow.

Obviously brimmed tank and lots of ballast in the boot will help loads.  I actually used my rather hefty brother yesterday to sit in my boot to get me going through the thicker stuff.

Y'know a thinner tyre cuts through the snow better because it puts the pressure on a smaller contact patch? Well why does letting some air out of your tyres to get a better grip in snow work then? Surely you're trying to get a bigger area of contact when you're doing that?

[cem_devecioglu]

actually this snow cutting theory is false..

the reason behind narrow tires is to decrease tire area, in order to increase weight /area ratio which will effect grip .. 

[Broomies Mate]

More to do with the width of the tyres on BMW's imo, they're usually quite wide compared to other marques which doesn't help in snow.  When my rear tyre blew out recently, I had more grip with the spare wheel on the back which had a much smaller contact patch to cut through the snow.

Obviously brimmed tank and lots of ballast in the boot will help loads.  I actually used my rather hefty brother yesterday to sit in my boot to get me going through the thicker stuff.

Y'know a thinner tyre cuts through the snow better because it puts the pressure on a smaller contact patch? Well why does letting some air out of your tyres to get a better grip in snow work then? Surely you're trying to get a bigger area of contact when you're doing that?

Yes and no.

A 'properly' inflated tyre is not good for traction when on ice, snow, wet or even dry roads.  A softer tyre will give much better traction in all conditions, but at the cost of wear, especially on dry roads.

When they find a way of making side walls as sturdy as the contact surface without reducing ride quality, we'll all be driving around with 10 PSI in our tyres.

[msb1973]

More to do with the width of the tyres on BMW's imo, they're usually quite wide compared to other marques which doesn't help in snow.  When my rear tyre blew out recently, I had more grip with the spare wheel on the back which had a much smaller contact patch to cut through the snow.

Obviously brimmed tank and lots of ballast in the boot will help loads.  I actually used my rather hefty brother yesterday to sit in my boot to get me going through the thicker stuff.

Y'know a thinner tyre cuts through the snow better because it puts the pressure on a smaller contact patch? Well why does letting some air out of your tyres to get a better grip in snow work then? Surely you're trying to get a bigger area of contact when you're doing that?

Yes and no.

A 'properly' inflated tyre is not good for traction when on ice, snow, wet or even dry roads.  A softer tyre will give much better traction in all conditions, but at the cost of wear, especially on dry roads.

When they find a way of making side walls as sturdy as the contact surface without reducing ride quality, we'll all be driving around with 10 PSI in our tyres.

they have they are called runflats 8-)

[TheBoy]

More to do with the width of the tyres on BMW's imo, they're usually quite wide compared to other marques which doesn't help in snow.  When my rear tyre blew out recently, I had more grip with the spare wheel on the back which had a much smaller contact patch to cut through the snow.

Obviously brimmed tank and lots of ballast in the boot will help loads.  I actually used my rather hefty brother yesterday to sit in my boot to get me going through the thicker stuff.

Y'know a thinner tyre cuts through the snow better because it puts the pressure on a smaller contact patch? Well why does letting some air out of your tyres to get a better grip in snow work then? Surely you're trying to get a bigger area of contact when you're doing that?

Yes and no.

A 'properly' inflated tyre is not good for traction when on ice, snow, wet or even dry roads.  A softer tyre will give much better traction in all conditions, but at the cost of wear, especially on dry roads.

When they find a way of making side walls as sturdy as the contact surface without reducing ride quality, we'll all be driving around with 10 PSI in our tyres.

they have they are called runflats 8-)

And useless bloody things they are too. Even on cars who's manafacturer claims they have designed the suspension around them, my poor spine suffers.

Sadly, I suspect they will become the norm eventually

[TheBoy]

More to do with the width of the tyres on BMW's imo, they're usually quite wide compared to other marques which doesn't help in snow.  When my rear tyre blew out recently, I had more grip with the spare wheel on the back which had a much smaller contact patch to cut through the snow.

Obviously brimmed tank and lots of ballast in the boot will help loads.  I actually used my rather hefty brother yesterday to sit in my boot to get me going through the thicker stuff.

Y'know a thinner tyre cuts through the snow better because it puts the pressure on a smaller contact patch? Well why does letting some air out of your tyres to get a better grip in snow work then? Surely you're trying to get a bigger area of contact when you're doing that?

Yes and no.

A 'properly' inflated tyre is not good for traction when on ice, snow, wet or even dry roads.  A softer tyre will give much better traction in all conditions, but at the cost of wear, especially on dry roads.

When they find a way of making side walls as sturdy as the contact surface without reducing ride quality, we'll all be driving around with 10 PSI in our tyres.

they have they are called runflats 8-)

Thinking about it, I think you are incorrect

[cem_devecioglu]

normal tires when used with low pressures for sometime start to fracture and erode in the sidewalls which is "good for your health" in the near future

not sure the same applies to run flats , but imo they are "human made" so cant resist eternally

[TheBoy]

normal tires when used with low pressures for sometime start to fracture and erode in the sidewalls which is "good for your health" in the near future

not sure the same applies to run flats , but imo they are "human made" so cant resist eternally

Letting the air out of runflats will just put the alarm on, possibly speed limit car, and knacker the tyre.

[zirax]

And useless bloody things they are too. Even on cars who's manafacturer claims they have designed the suspension around them, my poor spine suffers.

Sadly, I suspect they will become the norm eventually

I think you are right in that they will become standard. The manufacturer saves the cost of 1x alloy or space saver for every car sold. They will also likely get kick backs from the runflat makers. That will soon add into massive savings. I seem to recall Citroen saving a fortune on their cars by have one less wheel nut on each wheel?

[TheBoy]

And useless bloody things they are too. Even on cars who's manafacturer claims they have designed the suspension around them, my poor spine suffers.

Sadly, I suspect they will become the norm eventually

I think you are right in that they will become standard. The manufacturer saves the cost of 1x alloy or space saver for every car sold. They will also likely get kick backs from the runflat makers. That will soon add into massive savings. I seem to recall Citroen saving a fortune on their cars by have one less wheel nut on each wheel?

Manufacturers will do it for boot space...


I know some of the Rover cost savings - one was to remove the Rover badges from the D post, this saved about £150,000 per year...

[feeutfo]

Run flats tramline like absalute bastuard ime. 

[Kevin Wood]

Run flats tramline like absalute bastuard ime. 

Yep. Sidewalls are too stiff.

The only person I know who tried to drive on a flat run-flat got pulled over and told "not to be so fsckng stupid" by a traffic cop, so the whole idea is a complete fail, IMHO. Not surprising when you consider it's being pushed by BMW.

Kevin

[Del Boy]

normal tires when used with low pressures for sometime start to fracture and erode in the sidewalls which is "good for your health" in the near future

not sure the same applies to run flats , but imo they are "human made" so cant resist eternally

Letting the air out of runflats will just put the alarm on, possibly speed limit car, and knacker the tyre.

The pressure sensors only go off if one wheel has less rolling resistance than the others, so if they're all the same they should be fine 

It won't be good for the tyre though to purposely let the air out of a run flat though.