[BLKSAPPE92]

Originally Posted by verysideways

May be the case in the good ol' US of A but not in the UK and i suspect not in the rest of Europe either.

As an example i recently purchased a new set of Goodyear Eagle Asymmetric 2 in a 225/40R18 size, arguably one of the best performance tyres on the market at the moment in Europe, and certainly better than anything that's come from Bridgestone in recent years.
These were £103 each in non-runflat, and £187 each for runflats of the same tyre. Almost twice the price!

People may get more miles from a runflat, but that can only come from a harder compound which means less grip, that's got nothing to do with whether the tyre is a runflat or not.
The stock Bridgestone RE050A runflats that so many of us in Europe got on our E9x M Sport cars last for miles and miles, but the grip in the dry is poor and in the wet is abysmal - due primarily to the hardness of the compound.

Sorry but i'd rather have grippy tyres, even if i have to replace them a little more often (and given the price difference they still work out more cost effective in the long run!).

the inside of the tire is reinforced not the outside the rubber on the outside of same model run-flat to non run-flat have similar wear and traction

Pirelli P zero, run flat and non both have a tire wear of 220 AA A
Bridgtone RE050a runflat and non both have 140 A A

And those ratings only apply to each manufacturers tire lineup its not universal to all manufactures so bridgestone 140a a and pirelli 220 aa a mean nothing comparing them to each other as bridgestone is saying there re050a is 140 a a compared to another bridgestone different model tire. Michelin underrates all there tires so a 140 A A or a 220 A A can be similar to what other manufactures call a 300 AA A and a Michelin will go longer miles then a competitors but they also cost more.

Cheaper tires don't usually last longer and they usually wear unevenly because they are not using bi compounds harder inner 1/3 to 2/3 tire to softer outer patch for corning and negative camber cars. Usually the steal belts are substandard narrow/thin so if you drive higher speeds the tire deforms easier causing uneven wear near the beginning life of the tire and only gets worse towards the end. Im not saying I won't buy other tires just saying I wouldn't buy Sumitomo, Kumho, Falkin, and Hankook.

Id stick with Michelin, Pirelli, Bridgestone, Conti, or Yokohama in that order but Pirelli and bridstone are the only two that make run flats for my 19's and I still don't know if I wan't a Michelin PSS cause right now my car is spirited driving not on track so I enjoy the convience

[BLKSAPPE92]

Originally Posted by insane79

Nice info, tell me one thing, you will never buy any of the "M" cars cause they don't come with rfts? why do all the "M" cars come with tubeless
Think again..

First all cars have tubeless tires highway speeds and tubed tires would generate to much heat. 335i come with a tubeless run flat and M cars come with m3 PS2 and new m5 and m6 PSS. Xm cars have run flats.

Now M cars don't use run flats because BMW would have to tweak the suspension to ride and handle similar to if it didn't have them. Run Flats when hard cornering don't tell you when the car is gonna break loose the tires just let go run flat or non in same model usually have same traction and tread rating but since the side flex less their is no warning if you are on a sharp corner on track when your tires let loose similar to why race cars don't have super low profile tires like my 225/40/19 255/35/19 unless your into drifting.

and yes I would own a M3 and id have Michelin PSS on it and if the car was designed for run flats since I don't do tracking much id probably go to a run flat since I buy my bmw's to drive them and put miles on them

Bridgestone started developing run flats in the 80's they started there re050 line in 2002 on the Z4, 2003 on the 6 series (standard) 2003 5 series standard/optional)

Maserati Quattroporte 2004 Potenza RE050 Optional
Ferrari 612 Scaglietti 2004 Potenza RE050 Optional
Ferrari 599 GTB 2006 Potenza RE050 Optional
NISSAN GT-R 2007 on 2013 POTENZA RE070R RFT Standard,depending on grade.
dunlop sp sport maxx gt 600 dsst ctt extreme perf summer
bridgestone blizzak lm-25 RFT perf winter/snow

I think bridgestone from 2002 to 2013 can prefect a tire along with BMW and other major car manufactures. I doubt the current re050a is anywhere close to the 2002 re050 thats 11yrs of fine turning rubber compounds and bmw tuning its suspension being a 335 was tuned for run flats i think it be similar to driving a Cadillac when you take them off if you like that ride why not just get a spongy loose v series

Bridestone rates there conventional vertical tire stiffness on re050a pole position at
100

re050a Runflats vertical tire stiffness
1st Gen 120
2nd Gen 115
3rd Gen 105

[verysideways]

I think Dhoffm80 has been spending too much time in the Florida sun...

[insane79]

Originally Posted by Dhoffm80

First all cars have tubeless tires highway speeds and tubed tires would generate to much heat. 335i come with a tubeless run flat and M cars come with m3 PS2 and new m5 and m6 PSS. Xm cars have run flats.

Now M cars don't use run flats because BMW would have to tweak the suspension to ride and handle similar to if it didn't have them. Run Flats when hard cornering don't tell you when the car is gonna break loose the tires just let go run flat or non in same model usually have same traction and tread rating but since the side flex less their is no warning if you are on a sharp corner on track when your tires let loose similar to why race cars don't have super low profile tires like my 225/40/19 255/35/19 unless your into drifting.

and yes I would own a M3 and id have Michelin PSS on it and if the car was designed for run flats since I don't do tracking much id probably go to a run flat since I buy my bmw's to drive them and put miles on them

Bridgestone started developing run flats in the 80's they started there re050 line in 2002 on the Z4, 2003 on the 6 series (standard) 2003 5 series standard/optional)

Maserati Quattroporte 2004 Potenza RE050 Optional
Ferrari 612 Scaglietti 2004 Potenza RE050 Optional
Ferrari 599 GTB 2006 Potenza RE050 Optional
NISSAN GT-R 2007 on 2013 POTENZA RE070R RFT Standard,depending on grade.
dunlop sp sport maxx gt 600 dsst ctt extreme perf summer
bridgestone blizzak lm-25 RFT perf winter/snow

I think bridgestone from 2002 to 2013 can prefect a tire along with BMW and other major car manufactures. I doubt the current re050a is anywhere close to the 2002 re050 thats 11yrs of fine turning rubber compounds and bmw tuning its suspension being a 335 was tuned for run flats i think it be similar to driving a Cadillac when you take them off if you like that ride why not just get a spongy loose v series

Bridestone rates there conventional vertical tire stiffness on re050a pole position at
100

re050a Runflats vertical tire stiffness
1st Gen 120
2nd Gen 115
3rd Gen 105

ok i have given up you ever heard of wheel cracks cause of the runflats putting extreme pressure on the rims when hitting a pothole? anyways if you are comfy with runflats then good the thing is this side of the pond the roads are terrible & with normal michelin sport tubeless the car rides & handles like a dream.

[BLKSAPPE92]

Originally Posted by verysideways

I think Dhoffm80 has been spending too much time in the Florida sun...

lol maybe a little but I'm from Michigan and this car has seen Detroit roads for two weeks straight last Spring and been down a few Dirt Roads at Cabin and other family cabin up in the Upper Peninsula of Michigan

[BLKSAPPE92]

Originally Posted by insane79

ok i have given up you ever heard of wheel cracks cause of the runflats putting extreme pressure on the rims when hitting a pothole? anyways if you are comfy with runflats then good the thing is this side of the pond the roads are terrible & with normal michelin sport tubeless the car rides & handles like a dream.

Yes I know of wheel cracks but that's usually probably defective rims and hitting tank traps growing up in Detroit and UP its second nature for me to miss those. But yes I know they come out of nowhere but I don't txt and drive and usually ever talk over Bluetooth cause i like listening to music in car so I stay pretty alert about potholes/tank traps

[mob17]

Im literally out of breath reading all that.

[verysideways]

Originally Posted by Dhoffm80

lol maybe a little but I'm from Michigan and this car has seen Detroit roads for two weeks straight last Spring and been down a few Dirt Roads at Cabin and other family cabin up in the Upper Peninsula of Michigan

Ok, clearly subtlety is lost on you - your roads are not like our roads, your tyres are not like our tyres, your tyre compounds (even for "the same" tyre) are not like our compounds (i deal with several tyre manufacturers so i know this to be the case), and our wheel cracks are not caused by defective rims but by runflat tyres and the fact that they transmit sudden forces through the sidewall and into the wheel, whereas a conventional tyre (even an XL rated one) absorbs a lot more of this sudden force and distributes it more evenly along the edge of the wheel.

[BLKSAPPE92]

Originally Posted by verysideways

Ok, clearly subtlety is lost on you - your roads are not like our roads, your tyres are not like our tyres, your tyre compounds (even for "the same" tyre) are not like our compounds (i deal with several tyre manufacturers so i know this to be the case), and our wheel cracks are not caused by defective rims but by runflat tyres and the fact that they transmit sudden forces through the sidewall and into the wheel, whereas a conventional tyre (even an XL rated one) absorbs a lot more of this sudden force and distributes it more evenly along the edge of the wheel.

First you don't have a Bridestone Plant in the UK so I imagine they come from the EU. Second I don't think that BMW has tires shipped from the USA to mount them on BMW's being built in Germany. So I'm pretty sure are Bridgestone re050a rft are the same as yours along with Pirelli Pzero Rft and even a Michelin Pilot Super Sport which all should have the BMW recommended tire Star on the side.

W 168mph 270kph and Y 186mph 300kph rated tires no matter the country will be the same which is the case for BMW's equipped with sport package and Msport. W and Y rated tires have pretty high standards so why would a tire manufacture need to make different compounds for your W and Y rated tires then Germany or United States.

All Tires use The Uniform Tire Quality Grade (UTQG) ratings).

The European Tyre and Rim Technical Organisation (ETRTO) and the USA Tire and Rim Association (TRA) are two organizations that influence national tire standards. ETRTO works in liaison with the International Organization for Standardization to develop relevant standards.

Are Department of Motor Vehicles enforces above standards and puts there mark on approved tires here in USA.

I'm also curious why my tires are marked with E4 for being made in the Netherlands.

I even think this guys UK tires have the same DOT marking and made in E4 Netherlands. http://www.e90post.com/forums/showth...+potenza+re050
http://www.e90post.com/forums/showth...+potenza+re050

Even your Michilen Pilot Sport ZP's are Marked the same and made in E2 France. http://www.e90post.com/forums/showth...+potenza+re050

So explain to me why the UK needs different compounds then other countries?

[BLKSAPPE92]

The primary regional industry associations are listed below:

The Tire and Rim Association, Inc.
Copley, Ohio, USA
Associacao Latino Americana De Pneus E Aros (ALAPA)
San Paulo, Brazil
European Tyre and Rim Technical Organization (ETRTO)
Brussels, Belgium
Indian Tyre Technical Advisory Committee (ITTAC)
New Delhi, India
The Japan Automobile Tire Manufacturers Association (JATMA)
Tokyo, Japan
The Scandinavian Tire & Rim Organization (STRO)
Uppsala, Sweden
The Tyre and Rim Association of Australia (TRAA)
Hawthorn, Victoria, Australia
As tire manufacturing has become a global industry, these regional associations have formed liaisons with each other to assure future tire and wheel standards are global in nature and application.