Pelican Parts Forums - random pics that YOU have taken.......

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Originally Posted by GG Allin (Post 7500092)

I give up, what are those from?

Those are Twin-Tires,

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PUBLISHED ON JULY 25, 1994
TWIN TIRES—- THEY'RE BACK: NEW FIRM TO MARKET SYSTEM IN U.S.
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MALVERN, Pa.-It's not enough to just invent something. Robert W. Thomson discovered that along with his invention of a ``revolutionary'' pneumatic tire, for which he received in 1845 the first such patent of its kind.

He found he couldn't market the product, and it fell by history's wayside until successfully ``reinvented'' and marketed 43 years later by John Boyd Dunlop.

Malvern-based Twin Tire U.S.A. Inc. is hoping history will repeat itself.

The wholly owned subsidiary of publicly traded ATS Wheel Inc. of Vancouver, British Columbia, will begin marketing its twin tire wheel system throughout the U.S. in January.

It's a product that has been around for a while. The concept-developed by Swiss engineer Jerry Juhan-made its U.S. debut about eight years ago, available in the replacement market for a select few high performance vehicles.

But it never really caught on.

Twin Tire incorporated in March, four months after ATS Wheel won a $1.9 million patent-infringement lawsuit that forced the Dallas-based company that had been marketing the product, Twin Tire Systems Inc., to drop it after failing to meet quotas.

In a nutshell, the twin tire concept actually places two independent tires on one wheel. The design, according to Roger Cole, Twin Tire U.S.A.'s vice president of product development, ``greatly'' reduces the risks involved with flat tires and high-speed blowouts.

The company, which admittedly has yet to conduct independent testing on the system, claims its tests show drivers can control a car after one tire blows out at speeds of up to 72 miles an hour.

The design also enhances wet-weather performance with its center channel, which resembles the host of aquachannel tires that have hit the market during the past two years, the company said.

Belief in the dual tire's potential to attract the American consumer has drawn some veteran tire retailers to the company.

Twin Tire President and CEO Richard Miesen had been president and owner of several National Tire Warehouse franchised outlets in Pennsylvania, Delaware and Texas until 1992, when he sold them to NTW's parent, Western Auto Supply Co., itself owned by Sears, Roebuck and Co.

Thomas Pumpelly, who founded the NTW organization in 1971, has been retained by Twin Tire as a business consultant.

Twin Tire's marketing efforts will make or break the product, said Lee Napier, vice president of marketing and operations.

``A lot of people have seen this product before and may have a bad taste in their mouths because of the other company,'' Mr. Napier said. ``We have to change that.''

Until recently, a twin tire, the Anno-2000, was in limited production for five years by Yokohama Rubber Co. Ltd. through a joint Mitsubishi Corp.-Crimson Inc. venture called J.J.D. Japan Inc.

But it was marketed as a high performance tire for a limited number of relatively expensive cars. In contrast, the Twin Tire management team believes its tire can eventually blanket the U.S. passenger tire market.

Production is expected to begin later this year on a more general tire fitment, that will cover 50 percent of the cars being produced today, Mr. Cole said.

Instead of capitalizing on the tire's high performance handling characteristics, Twin Tire intends to go to market focused on a safety campaign designed to capture a wider audience, Mr. Napier said.

But the company is beginning almost from scratch.

Twin Tire is negotiating with a number of tire makers-including Goodyear, Michelin, General Tire, Cooper Tire & Rubber Co., Hankook Tire Manufacturing Co. Ltd., Avon Tyres Ltd. and Yokohama-with hopes that at least two will begin production. That, Mr. Cole said, would allow the product to enter the original equipment market in 1997.

The company also is looking at manufacturers for alloy and steel versions of its twin wheels.

Ultimately, the company intends to solicit U.S. dealers and distributors at industry trade shows, according to Mr. Napier.
http://www.tirebusiness.com/article/19940725/ISSUE/307259988/twin-tiresmdash-they-re-back-new-firm-to-market-system-in-u-s

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An opinion on Twintyre systems
Here's some first-hand opinions of the TwinTire system from someone who has been using them since the year dot. Take it away Mike from Perth, Australia:

I recall AVON started it off around 20 years ago but since they were the only manufacturer that it probably wasn't quite as widely accepted until Yokohama added theirs. The AVON does however still have a larger range of tyre sizes for twins - I think they go down to a 110 width for the 16" - but I'm not certain.

The Avon's are OK but a bit too hard compound for my preference. I like the Yokohama; they have a nice soft compound but wear very well indeed. Considering I have them on a Turbo 3Litre straight six they have lasted 65,000km with quite a bit of 'performance driving'. The only negative thing about the Yokohama is that odd 'memory' effect - where the rubber takes a bit longer to forget its standing-shape when you drive off after a long while standing still - especially if they were a bit deflated.

In respect of Wheels, there are about 3 styles I've seen in Perth:

* The full dish which looks a lot like a normal flat wheel.
* The mesh which is the cast equivalent that looks a bit like a wired rim.
* The spoke which has 5 large spokes - a bit like ROH but better styling - that's the type I have.

On the outside of the wheel is raised alloy lettering which reads 'Crimson, Inc'. Further around the side are three letters 'JIL'. The centre hub has a removable black/yellow plastic motif with the lettering 'JJD WHEELS CONCEPT® PRESENTED BY CRIMSON'. Mine have a 40mm offset.

When tyres are fully inflated, the gap between them is about 0.25" and the overall width is about 9.5". I used to run equal tyre pressures of 22PSI all round until I discovered you could tweak the performance by making the inside 4 tyres a little higher in pressure by about 5psi or a bit more until you notice the difference and can deal with it. So I used to have the front inside ones at 26psi, the front outside ones at around 20 to 22psi. The rear inside ones at 32psi and the rear outside ones at 26psi. This was my optimum setting for great breaking and plenty of warning when cornering really hard on stiff suspension. I varied the pressure just a bit if/when I noticed a change in wear pattern or if I had to compensate when swapping front to back to even out the wear overall. When I get my car back on the road I want to try 125/90 on the rear with 125/85 on the front.

I had to adjust the toe-in so it's not so severe (around 2mm) as the original 15" tyres had far too severe toe-in of around 6mm. The camber and castor should really be made more precise for twins since they track better. There was a little wandering at about 160 to 180km/h but I felt quite safe even up to 240km/h which was the cars limit, although I think I might select a slightly tighter toe-in for those long country trips. My car was one of those that had a bit of slop in the camber area and I think I could have had better tyre wear had this been set properly.

I suppose an automatic toe-in adjustment for speed might prove useful to further improve stability, save tyre wear and reduce fuel consumption - anyone care to comment on this? If so then feel free to email me.

The good thing was I never had a problem with a flat stopping me getting anywhere - the flat could usually be pumped up with that sealer stuff and it would be OK. The handling change is noticeable when one of them goes flat but you can keep going for ages - like 500km without any trouble and the flat one is not damaged and can still be used when the puncture is repaired. I wouldn't recommend travelling this sort of distance with a flat, even with twintyres, but it goes to show that they do the job they're supposed to.

By having the tyre pressures as I set them up meant I had lots of warning in terms of feel when I pushed it hard into a corner with a very predictable and surprisingly safe drift when they eventuallydid let go. I used to have Pirelli singles on an older car - they were great for road holding but gave virtually no warning when they'd let go - could be quite dangerous if you've never put the car to it's limits. I think it would be worthwhile trying Pirelli's with those tyre pressure settings (if they made the same sizes - that is).

It's like anything I suppose, there are lots of people that proclaim their particular selection over others but, I'd likely stick with the twins for the safety at least. Going through puddles at speed on ordinary singles was always a worry - with the twins it's so much safer and precise.

My recommendation if you wish to try twin tyres on your own car for any length of time is to have the camber and castor checked as precisely as possible, I'd even have it done when sitting in the drivers seat so the checks account for the included weight of the driver. Otherwise you might find the normal cars settings could be out quite a bit and this will give you premature wear and might even make the stability appear worse. If you can get those camber/castor correction units then thats the best thing as the twin tyres seem to tolerate less negative camber and less toe in as well but, naturally a bit of experimentation can give improved results.

http://forums.pelicanparts.com/uploa...1371334261.jpg