Article on Run Flats
06-16-2005, 05:42 AM
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RUN-FLAT ADVICE FROM TYRE MAKERS
Don't fit them to a standard car, industry body warns
Goodyear run-flat Fitting run-flats to a car not designed for them is inadvisable at best, according to the Tyre Industry Council (TIC).
A car?s suspension is specifically tuned for SST run-flat tyres for maximum safety, performance, handling and ride quality. SST Run-flat tyres must only be fitted in conjunction with a tyre pressure monitoring system to ensure that a tyre deflation is communicated to the driver at the earliest possible moment. Failure to do so could result in a tyre being run in a deflated condition for longer than the recommended period and the driver left in ignorance of a tyre?s condition.
Retrofitting of SST run-flat tyres may also compromise the ride characteristics of the vehicle to which they have been fitted because few older vehicles have been designed with run-flat fitment in mind.
An example pointed out to the TIC recently involved the fitment of a set of run-flat tyres to a 10 year old vehicle not fitted with a tyre pressure monitoring system. The car suffered a puncture and the driver was unaware of the deflated tyre, which was run in this state for some time, and the car failed its MOT because of damage to the tyre.
All major tyre manufacturers producing SST run-flat tyres, along with all major tyre retailers, recommend against fitting run-flat tyres to vehicles not originally designed with this type of tyre in mind.
Self supporting run-flat tyres must never be mixed with standard tyres on any vehicle.
[I]They don't want you to drive to far on RF's - It affects new tyre sales!
Also if you shouldn't mix RF's with conventional tyres why does BMW sell an optional ?70 spare wheel? Is it a spare RF?
RUN-FLAT ADVICE FROM TYRE MAKERS
Don't fit them to a standard car, industry body warns
Goodyear run-flat Fitting run-flats to a car not designed for them is inadvisable at best, according to the Tyre Industry Council (TIC).
A car?s suspension is specifically tuned for SST run-flat tyres for maximum safety, performance, handling and ride quality. SST Run-flat tyres must only be fitted in conjunction with a tyre pressure monitoring system to ensure that a tyre deflation is communicated to the driver at the earliest possible moment. Failure to do so could result in a tyre being run in a deflated condition for longer than the recommended period and the driver left in ignorance of a tyre?s condition.
Retrofitting of SST run-flat tyres may also compromise the ride characteristics of the vehicle to which they have been fitted because few older vehicles have been designed with run-flat fitment in mind.
An example pointed out to the TIC recently involved the fitment of a set of run-flat tyres to a 10 year old vehicle not fitted with a tyre pressure monitoring system. The car suffered a puncture and the driver was unaware of the deflated tyre, which was run in this state for some time, and the car failed its MOT because of damage to the tyre.
All major tyre manufacturers producing SST run-flat tyres, along with all major tyre retailers, recommend against fitting run-flat tyres to vehicles not originally designed with this type of tyre in mind.
Self supporting run-flat tyres must never be mixed with standard tyres on any vehicle.
[I]They don't want you to drive to far on RF's - It affects new tyre sales!
Also if you shouldn't mix RF's with conventional tyres why does BMW sell an optional ?70 spare wheel? Is it a spare RF?
06-16-2005, 05:46 AM
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sounds like they don't want to be liable for anything 
06-16-2005, 05:52 AM
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From my perspective, it's all about the tire pressure monitoring. Clearly it would be a bad idea to install runflats on a car with no monitoring system. I'm sure there are people out there who aren't aware of this fact that simply purchase runflats to install on older cars thinking that they're "good to go."
As far as mixing a non runflat spare with runflats, I don't think there's a problem since it's only a temporary condition. Again, I think there are probably people out there that think that runflats are a good idea so they may be buying them in pairs as they need tires...
As far as mixing a non runflat spare with runflats, I don't think there's a problem since it's only a temporary condition. Again, I think there are probably people out there that think that runflats are a good idea so they may be buying them in pairs as they need tires...
06-16-2005, 05:58 AM
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Originally Posted by Merv the Derv' date='Jun 16 2005, 08:42 AM
[I]They don't want you to drive to far on RF's - It affects new tyre sales!
Also if you shouldn't mix RF's with conventional tyres why does BMW sell an optional ?70 spare wheel? Is it a spare RF?
Also if you shouldn't mix RF's with conventional tyres why does BMW sell an optional ?70 spare wheel? Is it a spare RF?
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