My turn with run "flats"!
03-18-2019, 06:40 PM
#1
Junior Member
Thread Starter
My turn with run "flats"!
Saw a pothole. I felt it didn't look too bad and too late to swerve. Wrong, a few seconds after hitting it I see check tires... 15 psi in right front.
https://imgur.com/gijDFHi
https://imgur.com/q4Fiakb
https://imgur.com/2ngs9qP
Nice crack in tire and inside of wheel def. looks bent slightly. I dropped it off at dealer this morning. Waiting to hear back
I now feel the pain!
Jason
https://imgur.com/gijDFHi
https://imgur.com/q4Fiakb
https://imgur.com/2ngs9qP
Nice crack in tire and inside of wheel def. looks bent slightly. I dropped it off at dealer this morning. Waiting to hear back
I now feel the pain!
Jason
03-20-2019, 05:07 AM
#5
Senior Member
03-20-2019, 08:57 AM
#7
MBWorld Fanatic!
That fact that you don't have a choice in tires during the purchase of your car is what frosts me! Everything in the MB world seems optional, but not when it comes to your tires.
Last edited by rustybear3; 03-20-2019 at 08:59 AM.
Trending Topics
03-20-2019, 12:37 PM
#8
Super Member
my front driver side rim is cracked, every 2 days the psi dropped to 25. i can keep driving to work or get to an appointment on time without stopping to pump up the tire.
or try to pump air at 3am on a dark road.
03-20-2019, 08:01 PM
#9
Junior Member
Thread Starter
Seriously though, I blame my not swerving, the pothole being huge, and possibly the stiff sidewall of the run flat tires. Not hating on anything or anyone, just venting the slight pain of the inconvenience and time/money to get it repaired.
On the good news side, rim was just slightly bent so it was able to be repaired and the tire replaced. Back on the road again!
Jason
03-21-2019, 10:34 AM
#10
Not true.Because of the stiff sidewalls the runflats will cause tire damage and cracked wheels on potholes that would not cause damage on non runflats.I had a wheel crack even though the tire was not damaged by a relatively small pothole.After some argument Mercedes covered the cracked wheel under warranty.If you hit a deep enough pothole any tire or wheel will be destroyed,but the runflats are much more easily damaged than non runflats.
03-21-2019, 11:07 AM
#11
Senior Member
Yes, my catchy play with words caught by you! And I appreciate the information that any rim will bend and any tire will leak air. Thanks! LoL
Seriously though, I blame my not swerving, the pothole being huge, and possibly the stiff sidewall of the run flat tires. Not hating on anything or anyone, just venting the slight pain of the inconvenience and time/money to get it repaired.
On the good news side, rim was just slightly bent so it was able to be repaired and the tire replaced. Back on the road again!
Jason
Seriously though, I blame my not swerving, the pothole being huge, and possibly the stiff sidewall of the run flat tires. Not hating on anything or anyone, just venting the slight pain of the inconvenience and time/money to get it repaired.
On the good news side, rim was just slightly bent so it was able to be repaired and the tire replaced. Back on the road again!
Jason
03-21-2019, 02:41 PM
#12
Super Member
could it be Mercedes using cheap, weak rims that bend and crack easily?
or just blame it on run flat since it' wearing run flat.
just do a google " mercedes-benz cracked rims lawsuit ", you will see a bunch of results !
or just blame it on run flat since it' wearing run flat.
just do a google " mercedes-benz cracked rims lawsuit ", you will see a bunch of results !
03-21-2019, 03:10 PM
#13
I agree with the cheap weak rims,but there is no doubt they crack much more often with the runflats.This is pothole season in PA and I like my chances of not cracking a wheel on my continental 06"s.I am aware of the lawsuits about cracked wheels and they started appearing when MB went to runflats.
03-21-2019, 05:00 PM
#14
Junior Member
Thread Starter
Jason
03-21-2019, 08:42 PM
#15
Member
I'm all for non-runflats myself but let me ask a question.
Do you think hitting a pothole with non-runflats would help prevent a wheel crack/bending more so than a run-flat because of softer sidewalls OR would hitting a pothole with a run-flat prevent more damage since the tire is taking most of the punishment? Just curious to see what others think.
Personally I've never experienced a bent/cracked rim until i drove with run-flats. The only exception is running SSR rims with non-runflats. They're just known for being Super Soft Rims and expected over time, although the lips were awesome!
Do you think hitting a pothole with non-runflats would help prevent a wheel crack/bending more so than a run-flat because of softer sidewalls OR would hitting a pothole with a run-flat prevent more damage since the tire is taking most of the punishment? Just curious to see what others think.
Personally I've never experienced a bent/cracked rim until i drove with run-flats. The only exception is running SSR rims with non-runflats. They're just known for being Super Soft Rims and expected over time, although the lips were awesome!
03-22-2019, 09:02 AM
#16
Junior Member
Thread Starter
I'm all for non-runflats myself but let me ask a question.
Do you think hitting a pothole with non-runflats would help prevent a wheel crack/bending more so than a run-flat because of softer sidewalls OR would hitting a pothole with a run-flat prevent more damage since the tire is taking most of the punishment? Just curious to see what others think.
Personally I've never experienced a bent/cracked rim until i drove with run-flats. The only exception is running SSR rims with non-runflats. They're just known for being Super Soft Rims and expected over time, although the lips were awesome!
Do you think hitting a pothole with non-runflats would help prevent a wheel crack/bending more so than a run-flat because of softer sidewalls OR would hitting a pothole with a run-flat prevent more damage since the tire is taking most of the punishment? Just curious to see what others think.
Personally I've never experienced a bent/cracked rim until i drove with run-flats. The only exception is running SSR rims with non-runflats. They're just known for being Super Soft Rims and expected over time, although the lips were awesome!
My regular dude theory is the stiff run flat just transfers that much of the "hit" from the pothole to the rim. Nothing scientific from perspective though.
Jason
03-22-2019, 12:06 PM
#17
Member
Join Date: Dec 2016
Location: penn's woods USA
Posts: 136
Likes: 0
Received 15 Likes
on
14 Posts
2019 AMG C43 Sedan
I found this interesting.
Jump to search
[img]//upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Aufgeschnittener_Piranha-Pneu.jpg/220px-Aufgeschnittener_Piranha-Pneu.jpg[/img]Cutaway model of MOWAG Piranha tireA run-flat tire is a pneumatic vehicle tire that is designed to resist the effects of deflation when punctured, and to enable the vehicle to continue to be driven at reduced speeds - under 56 mph (90 km/h) - and for limited distances - generally between 10 mi (16 km) to 50 mi (80 km), depending on the type of tire.
In 1934, Michelin introduced a tire that was based on technology developed for local commuter trains and trolleys. It had a safety rim inside the tire which if punctured would run on a special foam lining. The tire was sold for military use and for specialized vehicles like bank armoured cars. It was advertised as "semi-bullet proof". While the tire performed as advertised it was far too expensive to be a feasible option for most private automobile users.[2]
In 1958, Chrysler teamed with Goodyear Tire and Rubber Company to offer Captive Air run-flat tires using an interlining to carry the weight.
In 1972 Dunlop launched the Total Mobility Tyre (later Denovo) "fail-safe" wheel and tire system that became optional equipment on the Rover P6 3500 in 1973,[3] and by 1983 evolved into the TD/Denloc which became standard equipment across the whole Austin Metro range.
Most recently, Bridgestone and Pirelli run-flat tires are supplied on some new model BMW cars. The automaker promoted these as a safety feature and as an alternative to carrying a spare tire.
Self-supporting run-flat tires are now common on light trucks and passenger cars and typically provide for the vehicle to drive for 50 miles (80 km) at around 50 miles per hour (80 km/h). However, if the tires are subject to this kind of misuse, wheels may become damaged in the process, and repair may be impossible or unsafe, especially if the tire is punctured in the sidewall or at the edge of the tread. These tires carry a 20 to 40 percent weight penalty over similar standard tires and the thicker sidewall also means higher rolling resistance, which reduces the vehicle's fuel economy.[4] However, the weight penalty of the induvidual tire is usually more than compensated by the fact that the vehicle need no longer carry a spare, as well as the equipment needed to swap in the spare. The thicker sidewall however results in more road imperfections filtering through the tire to the rim and hence to the car, which results in a harsher ride.[5]
There are also a number of retrofitted tire sealants which act in a similar way to self-sealing tires. These compounds are normally injected through the tire valve. The rotating force then distributes the compound onto the inner surface of the tire to act as a self-sealing lining within the tire.
The usual standard of performance, especially for military or security vehicles, are the Finabel standards.
Former US President Barack Obama's presidential limo, "the Beast", had Goodyear Kevlar lined run-flat tires.[7]
Types
Body
Framework
equipmentLighting
Run-flat tire
From Wikipedia, the free encyclopediaJump to navigationJump to search
[img]//upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Aufgeschnittener_Piranha-Pneu.jpg/220px-Aufgeschnittener_Piranha-Pneu.jpg[/img]Cutaway model of MOWAG Piranha tireA run-flat tire is a pneumatic vehicle tire that is designed to resist the effects of deflation when punctured, and to enable the vehicle to continue to be driven at reduced speeds - under 56 mph (90 km/h) - and for limited distances - generally between 10 mi (16 km) to 50 mi (80 km), depending on the type of tire.
Contents
Technologies[edit]
There are three basic technologies currently available, described below.Self-supporting[edit]
The origins of the commercial self-supporting run-flat tire started in 1935 with a tire that had a fabric inner tire. The tire was advertised as a protection against blow outs, a common and dangerous occurrence in the 1930s.[1]In 1934, Michelin introduced a tire that was based on technology developed for local commuter trains and trolleys. It had a safety rim inside the tire which if punctured would run on a special foam lining. The tire was sold for military use and for specialized vehicles like bank armoured cars. It was advertised as "semi-bullet proof". While the tire performed as advertised it was far too expensive to be a feasible option for most private automobile users.[2]
In 1958, Chrysler teamed with Goodyear Tire and Rubber Company to offer Captive Air run-flat tires using an interlining to carry the weight.
In 1972 Dunlop launched the Total Mobility Tyre (later Denovo) "fail-safe" wheel and tire system that became optional equipment on the Rover P6 3500 in 1973,[3] and by 1983 evolved into the TD/Denloc which became standard equipment across the whole Austin Metro range.
Most recently, Bridgestone and Pirelli run-flat tires are supplied on some new model BMW cars. The automaker promoted these as a safety feature and as an alternative to carrying a spare tire.
Self-supporting run-flat tires are now common on light trucks and passenger cars and typically provide for the vehicle to drive for 50 miles (80 km) at around 50 miles per hour (80 km/h). However, if the tires are subject to this kind of misuse, wheels may become damaged in the process, and repair may be impossible or unsafe, especially if the tire is punctured in the sidewall or at the edge of the tread. These tires carry a 20 to 40 percent weight penalty over similar standard tires and the thicker sidewall also means higher rolling resistance, which reduces the vehicle's fuel economy.[4] However, the weight penalty of the induvidual tire is usually more than compensated by the fact that the vehicle need no longer carry a spare, as well as the equipment needed to swap in the spare. The thicker sidewall however results in more road imperfections filtering through the tire to the rim and hence to the car, which results in a harsher ride.[5]
Self-sealing[edit]
See also: Self-sealing fuel tankThese tires contain an extra lining within the tire that self-seals in the event of a small hole due to a nail or screw. In this way, the loss of air is prevented from the outset such that the tire is either permanently self-repairing or at least loses air very slowly.There are also a number of retrofitted tire sealants which act in a similar way to self-sealing tires. These compounds are normally injected through the tire valve. The rotating force then distributes the compound onto the inner surface of the tire to act as a self-sealing lining within the tire.
Auxiliary-supported[edit]
[img]//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Sicherheitsreifen_BMK.jpg/220px-Sicherheitsreifen_BMK.jpg[/img]Run-flat tire with support ringIn this system, there is an additional support ring or insert attached to the wheel that can support the weight of the vehicle in the event of a loss of pressure. The run-flat insert has an unsurpassed ability to carry heavy vehicle loads for long distances at high speeds. It is therefore the normal run-flat selection for military vehicles, high-level executive protection vehicles, and "armored" vehicles used by government, aid groups, or private contractors in conflict zones.Standards of performance[edit]
The basic benefit of using run-flat tires is continued mobility in case of a loss of air pressure, due either to a 'normal' puncture or to a hostile deliberate act including a bullet strike while the vehicle is traveling at high speed. Performance criteria are therefore in terms of distance and speed at which the vehicle can escape without becoming immobile and the steering control over the vehicle during this process.The usual standard of performance, especially for military or security vehicles, are the Finabel standards.
Market share[edit]
Run-flat tires accounted for less than 1% of replacement tire sales in the U.S. in 2005. In 2006, it was expected that such tires would gain popularity with armored vehicle manufacturers, but growth figures were slow with one major model, the Michelin PAX System, no longer being developed by the manufacturer (though replacements will be produced for the foreseeable future).[6] A Michelin study released in 2008 found that 3 percent of drivers worldwide want run-flat tires. U.S. market share is well below 1 percent. American Honda Motor Co. announced that the 2009 Honda Odyssey Touring and Acura RL were its last models available with run-flat tires and with Honda no longer using run-flats. This leaves only a handful of volume manufacturers offering them as standard fittings and only on some models. An exception is BMW, who are the largest fitter of run-flats as original equipment.[4]Former US President Barack Obama's presidential limo, "the Beast", had Goodyear Kevlar lined run-flat tires.[7]
Factors contributing to small market share[edit]
Besides the cost, which can be more than double other tires of comparable size, run-flat tires can not be run flat if the flat is due to sidewall damage, a common cause of flats. Also, under the best circumstances, the speed and range that the run-flat tires can be run flat is very limited. Run-flat tires cannot be driven over 50 miles per hour and usually offer only up to 50 miles of extended mobility. These limitations lower the value of the extra expense for many buyers. In certain applications, depending on the vehicle, specific tire design, and driving surface, a run-flat tire can provide from 25 miles to 200 miles driving while flat with limited speed.See also[edit]
- Airless tire
- Direct TPMS
- Tire manufacturing
- Tire mousse
- Tire-pressure monitoring system
- Tweel - Michelin's air-free tire
References[edit]
- ^ "Fabric Inner Tube Lessens Blowout Hazards". Popular Mechanics. 63 (4): 488. April 1935. Retrieved 10 June 2012.
- ^ "Bullet Proof Tire Has Sponge Rubber Tube". Popular Mechanics. 62 (6): 872. December 1934. Retrieved 10 June 2012.
- ^ "Evening Times - Google News Archive Search". news.google.com.
- ^ Jump up to: a b Kranz, Rick (27 July 2009). "The air runs out of run-flat tires". The Center for Auto Safety. Retrieved 10 June 2012.
- ^ McIntosh, Jil (24 October 2017). "Run-Flats vs Self-Sealing Tires". Autotrader Canada. Retrieved 15 February 2019.
- ^ Jensen, Christopher (20 April 2008). "Michelin Giving Up on PAX Run-Flat Tire". The New York Times. Retrieved 2 July 2010.
- ^ "The Beast: President Barack Obama's High-Tech Super-Limo". thecarconnection.com.
Types
- Tubeless tire
- Radial tire
- Low rolling resistance tire
- Run-flat tire
- Michelin PAX System
- Airless tire
- Tweel
- Rain tyre
- Snow tire
- All-terrain tire
- Bar grip
- Knobby tire
- Large tire
- Mud-terrain tire
- Paddle tire
- Orange oil tires
- Whitewall tire
- Aircraft tire
- Tundra tire
- Bicycle tire
- Tubular tire
- Lego tire
- Motorcycle tyre
- Tractor tire
- Racing slick
- Formula One tires
- Spare tire
- Continental tire
- Camber thrust
- Circle of forces
- Cold inflation pressure
- Contact patch
- Cornering force
- Ground pressure
- Pacejka's Magic Formula
- Pneumatic trail
- Relaxation length
- Rolling resistance
- Self aligning torque
- Slip angle
- Steering ratio
- Tire balance
- Tire load sensitivity
- Tire uniformity
- Lateral Force Variation
- Radial Force Variation
- Traction (engineering)
- Treadwear rating
- Tire maintenance
- Tire rotation
- Bicycle pump
- Central Tire Inflation System
- Tire mousse
- Tire-pressure monitoring system
- Tire-pressure gauge
- Direct TPMS
- Bead breaker
- Tire changer
- Tire iron
- Tire manufacturing
- List of tire companies
- Retread
- Waste tires
- Tire recycling
- Tire fire
- Blowout
- Flat tire
- Ozone cracking
- [img]//upload.wikimedia.org/wikipedia/en/thumb/f/fd/Portal-puzzle.svg/16px-Portal-puzzle.svg.png[/img]Outline_of_tires
- [img]//upload.wikimedia.org/wikipedia/en/thumb/4/48/Folder_Hexagonal_Icon.svg/16px-Folder_Hexagonal_Icon.svg.png[/img]Category
- Diesel engine
- Electric
- Fuel cell
- Hybrid (Plug-in hybrid)
- Internal combustion engine
- Petrol engine
- Steam engine
- Automatic transmission
- Chain drive
- Clutch
- Constant-velocity joint
- Continuously variable transmission
- Coupling
- Differential
- Direct-shift gearbox
- Drive shaft
- Dual-clutch transmission
- Drive wheel
- Electrohydraulic manual transmission
- Electrorheological clutch
- Epicyclic gearing
- Fluid coupling
- Friction drive
- Gear stick
- Giubo
- Hotchkiss drive
- Limited-slip differential
- Locking differential
- Manual transmission
- Manumatic
- Parking pawl
- Park by wire
- Preselector gearbox
- Semi-automatic transmission
- Shift by wire
- Torque converter
- Transaxle
- Transmission control unit
- Universal joint
- [img]//upload.wikimedia.org/wikipedia/en/thumb/f/fd/Portal-puzzle.svg/16px-Portal-puzzle.svg.png[/img]Portal
- [img]//upload.wikimedia.org/wikipedia/en/thumb/4/48/Folder_Hexagonal_Icon.svg/16px-Folder_Hexagonal_Icon.svg.png[/img]Category
Body
Framework
- Backbone chassis
- Beltline
- Body-on-frame
- Bumper
- Cabrio coach
- Chassis
- Continental tire
- Crumple zone
- Dagmar bumpers
- Fender
- Fender skirts
- Grille
- Hood
- Hood scoop
- Monocoque
- Overhang
- Pillar
- Platform
- Pontoon fenders
- Quarter panel
- Roof rack
- Shaker scoop
- Spoiler
- Stressed member engine
- Subframe
- Tonneau
- Trunk lid
- Greenhouse
- Power window
- Quarter glass
- Opera window
- Sunroof
- Windshield/windscreen
- Windshield/windscreen wiper
- Bumper sticker
- Curb feeler
- Front-end bra
- Hood ornament
- Japan black
- Nerf bar
- Omniview technology
- Run-flat tire
- Spare tire
- Tire/tyre
- Tow hitch
- Truck accessory
- Window deflector
- Approach and departure angles
- Breakover angle
- Overhang
- Ride height
- Roll center
- Turning radius
- Weight distribution
equipmentLighting
- Daytime running lamp
- Headlamp
- Hidden headlamps
- Turn signals
- Rear position lamps
- Stop lamps
- Reversing lamps
- Safety reflector
- [img]//upload.wikimedia.org/wikipedia/en/thumb/4/48/Folder_Hexagonal_Icon.svg/16px-Folder_Hexagonal_Icon.svg.png[/img]Category
- [img]//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png[/img]Commons
- [img]//upload.wikimedia.org/wikipedia/en/thumb/f/fd/Portal-puzzle.svg/16px-Portal-puzzle.svg.png[/img]Portal
Navigation menu
Personal tools
- Not logged in
- Talk
- Contributions
- Create account
- Log in
Namespaces
Variants
Views
More
Search
Navigation
- Main page
- Contents
- Featured content
- Current events
- Random article
- Donate to Wikipedia
- Wikipedia store
Interaction
Tools
- What links here
- Related changes
- Upload file
- Special pages
- Permanent link
- Page information
- Wikidata item
- Cite this page
Print/export
In other projects
Languages
5 more- Catalā
- Čeština
- Eesti
- Espaņol
- Bahasa Indonesia
- Italiano
- Latviešu
- Nederlands
- 日本語
- Portuguęs
- Русский
- Slovenščina
- Suomi
- 中文
- This page was last edited on 14 February 2019, at 17:30 (UTC).
- Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. WikipediaŽ is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
