Re: Dunlop Tyres

[sooty@xxxxxxxxxxxxxx (Patrick Sutton)]

>Did Dunlop care to explain why a properly inflated tire can only stay
properly inflated for about maybe two weeks!!....and a tire 10 to 20%
underinflated tire can keep its inproper pressure for months!!.....This
seems to have been my experience with all tires on all of the vehicles I
have ever owned!!

In my experience , the tyres on my cars, bikes and even on my trucks very
rarely need reinflating.  Luck of the draw I guess.  But I still check the
pressures on a weekly basis... those slow punctures creep up on you
occasionally.


>I think that it is a conspiracy by the tire manufacturers.  They build a
tire that will not hold recommended pressure, yet will not go totally flat
or be visually low on air pressure.  Most people will not put air in their
tires unless someone else tells them that their tires are aweful low!!!
.....which means that the tire manufacturers are 30% closer to their next
tire sale!!

There's no substitute for regular checking to spot any underinflation and
maximise tyre life.

>
>-David Arnett (Houston TX)

Regards

Patrick
>
>>>> Patrick Sutton <sooty@xxxxxxxxxxxxxx> 07/22 3:40 AM >>>
>Hi all,
>
>Yesterday I had to go and  spend a day at Fort Dunlop where they make tyres
>. It was what they called a Kaizen Day.
>
>I was lucky enough to get attached to the Motorsport Team for the day. They
>had just got back from Germany and Oulton Park with thier trucks and tyre
>support vehicles.
>
>Picture walking into a warehouse with 130,000 assorted race tyres stocked to
>the ceiling !
>
>Imagine my facial expression as they unloaded tyres that had been used on
>top rider bikes and then throwing them into a rubbish skip !
>
>Some tyres had only done 4 laps !
>
>All those slicks from the WSB and Grand Prix bikes and the D207's from the
>Supersport 600s.. I could have cried !
>
>I managed to aquire a cpl of sets of new 207's so the Son and Heir is ok for
>tyres for the rest of this summer. He is destroying the current D207s at an
>alarming rate and I'm questioning whether he should be trusted with my pride
>and joy !
>
>Tyre facts.
>
>We are taling truck tyres here but similar figures apply to all tyres.
>
>20% underinflation results in a 25c temp increase.
>
>20% underinflation results in 30% reduction in tyre life.
>
>In a survey they found that
>
>20% of all tyres on the road are underinflated by 10%
>10% are underinflated by 20% .
>
>Which equates to
>
>20% of all vehicles are using 1.2 % excess fuel
>10% of all vehicles are using up to 4 % excess fuel.
>
>Big numbers when you think that a truck only does 7 or 8 mpg.
>
>You've by now heard of Prisoner elecronic tagging.. well Dunlop have now
>developed an electronic tyre tag.
>
>When fitted to a 295/80/R225 truck tyre, the internal tag passes the contact
>patch , 7 times / sec at 80 kph with and acceleration of  90G .
>
>During the 100,000 cycle this would mean it passes the contact patch over
>31,500,000 times .
>
>It's all clever stuff eh.
>
>Patrick
>
>
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