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WARNING - Coker Radial Tires
- Tom_Parkinson
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Josh--thank you for the info.
--Tom
With brakes, two cylinders are better than one.
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- Josh Malks
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I will remind you that originally aftermarket tubeless tires were [i:jbkppjsi]all[/i:jbkppjsi] installed on tube-type rims.
No sealer needed at rim or valve hole. My tire guy uses a black guck (like roofing compound) to seal the rivets. May not be necessary, but extra protection
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- Tom_Parkinson
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Since two of the Ladies want new "shoes," this thread is of great immediate interest to me. If anyone finds further information or has knowledge of safe-to-use tubes, please be sure to post that info.
Josh, I am interested that tube-type rims hold air with tubeless tires. Did you use any sealer at the beads or valve stems? Did you seal the rivets inside the wheel?
A friend has put radials on Chevy truck rims onto his '40 LaSalle--claims it drives like a wholly new car. I may do the same with my '40 LaSalle. Those rims, of course, will not fit the Cord.
--Tom
With brakes, two cylinders are better than one.
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- Josh Malks
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Josh B. Malks
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Thanks very much for digging into this and posting the information.
The Coker tire does say "Tube-type" and the inner tubes I've been using are the ones supplied by Coker. The pin hole was in the sidewall of the tube and was NOT at a joint.
I looked over the tube carefully (I didn't cut it open) but there does not appear to be an overlap joint anywhere on the tube. The rubber that come in contact with the rim appears to be heaver then the rest of the tube. Also the tube is marked "Universal Heavy Duty" There is nothing on it that indicates it would be for a radial tire.
I should comment on the blow out we experienced. We were doing about 70 mph (the speed limit) when the left front tire blew out. within about 1 second the tire was gone and we were on the rim. The CORD handled fantastically!!! We were able to pull off onto the right shoulder and stop with out any difficultly. The car didn't even think about pulling to the left or yanking us around. Lucky for us the tractor trailer we had just passed saw what was happening and backed off to give us plenty of room to get off the road. I was really amazed at how well the Cord handled for being on the rim (and the front spring bolt dragging on the ground).
Jim
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- Chris Summers
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Josh B. Malks
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- Tom_Parkinson
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Does anyone know of a normally-available modern-era tubeless-designed rim that will fit the 801/812 Cord hubs?
--Tom
With brakes, two cylinders are better than one.
Editor-in-Chief Emeritus, The Hardtop News Magazine, the Journal of the Michiana Dunes Region, Lambda Car Club International
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- Josh Malks
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Now that IS true. The stock Cord (and other pre-tubeless tire) rims do not have the "safety bump" that will keep the tire on the wheel even if it deflates. Don Wohlwend's new aluminum wheel uses the current DOT rim configuration.
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- West Peterson
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I prefer to run on bias ply tires with my Packard. When I want to drive a car that feels like a modern car, I jump in my Saturn.
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- mikespeed35
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CORDially Mike
Mike Huffman
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- Josh Malks
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When Allstate-labeled Michelin tubeless radial tires were first offered for sale in the US by Sears in 1966 they were often mounted on rims designed for tube-type bias-ply tires. No significant problems.
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- Josh Malks
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Seems there are two issues. First, these tubes are all made in Poland. The manufacturer stamps on the tube whatever country name the customer wants. When the company started making them they had no previous experience making tubes and delivered a bad batch. These are the ones that are splitting. Current production has no problem, says Stan. Still, this does not explain Jim's pinhole, or instill a great deal of confidence.
Stan also says that a tube may be used in a radial tire if the tire sidewall says "tube-type". (Jim, could you tell us what the Coker sidewall says?) Those tires do not have the sealing bead that tubeless tires have, so they will indeed leak without a tube. Even more important for users of Coker radials, Stan says that a radial tube is different from a bias-ply tube. The bias-ply tube has a butt joint around the circumference of the tube. Radial tubes must have an overlapping joint. (Jim, could you tell us what joint your tubes have? And are the splits or the pinhole at a joint?)
This is serious, potentially life-threatening issue. Anyone else have any experience with this?
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- Josh Malks
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- Josh Malks
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The salesperson at Coker could not answer why their tires need tubes. I finally got to a tech guy who said "Confidentially, it's because without tubes they leak". (!!!)
The attraction of the Coker radial is that it looks like a bias-ply 6.50-16. Goodyear and Hankook 215/R75-16 do not. But I'm not sure I want to trust my life to a company that sells a product that contradicts hard technical data. And a 4-year life expectation for a tube in their own tires, in cars that may be driven 1,000 to 5,000 miles in that time sounds like an excuse for an engineering issue.
Jim's experience is sobering.
Here's the link to which Dennis refers.
[url:ihx017bj]http://forums.aaca.org/f143/warning-defective-inner-tubes-286287.html[/url:ihx017bj]
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- Dennis Long
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the posts about defective tubes. This is disturbing and there does not seem to be any definitive answers.
Dennis
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- Pat Leahy
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Last year on the way to Auburn we experienced a "catastrophic deflation" of the left front tire on the Ohio turnpike. In several calls to Coker and conversations with them at Hershey all I could get was "we don't know what happened"
The past weekend while sitting on the show field at a local show the right front tire went flat. When I pulled the tire off the rim and found a pin hole in the sidewall of the tube. There was no sign of rubbing, wear, etc. and the hole was not at a seam. There was no sign of problem with the tire or the tube other then the pin hole.
In talking with Coker again today they told me the tubes today are only good for about 4 years if you drive the car. If the tires are sitting with the weight off then they will last longer. Needless to say I'm replacing the tubes in all 4 tires.
So if anyone out there is using the Coker radials and drive their car they should think about replacing their inner tubes every 3 or 4 years.
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