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    Tire mousse?

    Watching the WRC - Rally de France - this evening on the Speed channel, they showed a new light donut insert, which pretty much fills the space between the tire and the rim. They still pressure it w/ a bit of air, but not much and this - they called it mousse - donut attaches radially to the tire and eliminates the effects of punctures, etc. It seemed to be a very light material, and if this is true, it may be a better solutin than the heavier run-flats?

    Anybody know about this?

    Re: Tire mousse?

    I guess the next logical question to this mousse is whether this can last more than a few race length to be applied to road tires.

    Re: Tire mousse?

    I could imagine the durability ove several years might be the biggest issue on this device.

    Re: Tire mousse?

    There's no reason this material should age faster than regular tire rubber. No opinions on this? I did a little research and found that tire manufacturers (Michelin) are indeed supplying these inserts for rally cars and off-road vehicles.

    The idea makes sense and in particular for our high performance tires which are paper thin. Actually, instead of a separate insert they might consider adding a super-light thick layer to add to the overall tickness. Imagine a tire that has almost no air chamber. That would pretty much resolve any puncture issue.

    Re: Tire mousse?

    I found out Michellin offers similar system for their version of run-flats called PAX system.

    Run-flat Tire Information

    Jean said:
    I found out Michellin offers similar system for their version of run-flats called PAX system.

    Thanks Jean. Using Google, I searched for Michelin's PAX system. It originally debuted in 1996 as the PAV system which stands for, Pneu ? accrochage vertical or PAV, which can be translated as "Vertical Anchorage Tire" for the way the tire bead "seats onto the rim vertically." The new concept made run-flat capability possible without having to contend with a large performance compromise.

    The original acronym PAV was changed to PAX in 1998: "because of its universality--and for the values of peace of mind, safety and the future that it conveys."

    In Latin, the word "pax" stands for "peace."

    Also, a member from explained the differences between the two types of run-flat technology:

    Here is some info on the various run-flat systems. The MINI uses a self-supporting tire on a regular rim.


    Self-supporting tires feature a stiffer internal construction which is capable of actually temporarily carrying the weight of the vehicle, even after the tire has lost all air pressure. These tires typically sandwich rubber between layers of heat resistant cord in the sidewall to help prevent the sidewalls from folding over on themselves and "pinching" their sidewalls in the event of loss of air pressure to give the tires "self-supporting" capability. They also feature specialized beads which allow the tire to firmly grip current original equipment and aftermarket wheels even in the event of air loss. Because self-supporting tires are so good at masking the traditional loss-of-air symptoms which accompany a flat tire, they require a tire pressure monitoring system to alert the driver that they have lost air pressure. Without such a system, the driver may not notice underinflation and may inadvertently cause additional tire damage by failing to inflate or repair the tire at the first opportunity. Typically, self-supporting tires maintain vehicle mobility for 50 miles at speeds up to 55 mph. The Firestone Firehawk SZ50 EP RFT developed specifically for the Chevrolet Corvette C5 as well as the BFGoodrich Comp T/A ZR SSS, Dunlop SP Sport 9000 DSST, Firestone Firehawk SH30 RF and Michelin ZP are self-supporting run flat tires.

    Auxiliary Supported Run Flat Systems

    Auxiliary supported systems combine unique wheels and tires and are currently under development for use on future original equipment vehicle applications. In these systems, when the tire loses pressure, it rests on a support ring attached to the wheel. The advantage to this type of system is that it will place most of the task of providing run-flat capability on the wheel (which doesn't "wear out" or need to be replaced), and minimizes the responsibility of the tire (which does wear out and requires replacement). Additionally, auxiliary supported systems promise better ride quality because their sidewall's stiffness can be equivalent to today's standard tires. Today, only a few vehicles use Michelin's PAX System. Goodyear and Pirelli have announced that they will also develop run flat tires based on the PAX System, while Continental is currently developing an alternate design. The disadvantage to auxiliary supported systems is that their unique wheels will not accept standard tires and that their lower volume will make this type of system more expensive. It is too early to confirm which system, if either will be widely accepted by vehicle manufacturers and consumers in the future.

    In Europe, the PAX system has been available on the Renault Scenic, Audi A8, A6, the Rolls Phantom, and the upcoming Bugatti Veyron. In America, the only vehicles currently offered with PAX are the Phantom and the 2005 Honda Odyssey Touring. Nissan will be incorporating it into some of its autos for the 2005 year as well.




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