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Old 02-15-2016, 05:17 AM   #267
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One other interesting tidbit. The standard tire in the 70's was a Goodyear Travel Trailer bias ply tire. Rims were steel with wheel discs. The Michelins had enough traction that they would flex the rims when turning sharp and the wheel discs would fall off. Eventually Airstream made aluminum wheels available to correct the problem.
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Old 02-15-2016, 06:22 AM   #268
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Thanks for the history correction, Andy. The information I posted was what I could find from Airstream's literature archive. I sure helps to have your experience here. Much appreciated.
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Old 02-15-2016, 08:56 AM   #269
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Page after page of tire speak and I still can't find out why a few years ago on this forum no one ran LT tires.
The hot rubber was the bias ply trailer tire.
What changed? How did LT tires become trailer tires?
IMO there were a few things that changed that accumulated with result being more tire failures on tires as supplied and when looking for alternatives LT are the obvious improvement is many cases.

We have seen highway speeds increase over the past few years but ST tires have a rating (with a few exceptions) of 65 mph max so more people were exceeding the speed capability of the tires.

More features and "stuff" has been added to the load on tires and higher load can result n increased failure rate.

Continued pressure to lower the price (Walmart mentality) has resulted in low cost to the RV company being the primary characteristic of interest not best quality.

The above and similar changes which all negatively affect tire life do add up.
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Old 02-15-2016, 10:23 AM   #270
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One other interesting tidbit. The standard tire in the 70's was a Goodyear Travel Trailer bias ply tire. Rims were steel with wheel discs. The Michelins had enough traction that they would flex the rims when turning sharp and the wheel discs would fall off. Eventually Airstream made aluminum wheels available to correct the problem.
Andrew,

Is there a problem with using the Michelins with modern steel wheels. Is there any advantage to aluminum wheels over steel wheels other than appearance?

Thanks,
Grant
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Old 02-15-2016, 11:30 AM   #271
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Wheel discs equal wheel covers?
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Old 02-15-2016, 01:38 PM   #272
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You mean hubcaps?
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Old 02-15-2016, 01:50 PM   #273
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Hubcaps only cover the hub, covers cover the whole wheel. Wheel covers are prone to jettison on sharp corners.
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Old 02-15-2016, 02:01 PM   #274
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Weight would be my guess?
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Old 02-16-2016, 07:45 AM   #275
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Another reason the 700-15 went away is that they were tube type not tubeless and who wants a tube type tire....my 23' avion came with steel wheels and G-78-15....-and steel wheels..
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Old 02-16-2016, 08:54 AM   #276
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The four Michelin LTX (P) 235/75R15 XL tire's on our 23D are not carrying the same weight on the 3,000 pound rated axles:

Front….1,280……1,246 - total front axle 2,526
Rear…..1,376……1,233 - total rear axle 2,609
Total Axles………………………………….5,135

Thus unless one knows each tire's load, the conservative approach is to use a 15% safety margin in addition to derating these tires to 1,985 pounds from the sidewall 2,183.

The left rear gets the 18 gallon black tank load. Also all the shower and toilet weight is concentrated in that area. The right rear load was decreased about 50 pounds by removing the six gallons of water weight in a tank style water heater and installing an instant on Truma custom water heater and then increased slightly by a better quality 10" Rocky Mountain mattress.

The left side has more load due to the complete solar system controllers and lithium battery system being installed under the street side (left) sofa and dinette seat.
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Old 02-16-2016, 09:14 AM   #277
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Another reason the 700-15 went away is that they were tube type not tubeless and who wants a tube type tire....my 23' avion came with steel wheels and G-78-15....-and steel wheels..
My 84 30 foot Avion also came with either those tires or 700/15 with steel wheels.
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Old 02-16-2016, 09:16 AM   #278
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Another reason the 700-15 went away is that they were tube type not tubeless and who wants a tube type tire....my 23' avion came with steel wheels and G-78-15....-and steel wheels..
My 84 30 foot Avion also came with those tires and steel wheels.
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Old 02-16-2016, 10:29 AM   #279
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The comments about early (1970's) wheels flexing enough to eject wheel covers when radials were used is an example of why it is important to know if your steel wheels are rated (designed) for radial tire use.
Excess flexing can result in steel fatigue which can result in wheel failure.

As far as I know most cast aluminum wheels made since the 80's are probably OK for use with radial tires.

A side note on wheel failure. I have experienced wheel failure on my race car after about 3,000 miles usage but these were light weight multi 3 piece wheels with cast center and spun flanges that bolted together. Application on a relatively heavy car resulted in fatigue failure. Luckily we were doing magnaflux dye penetrant inspection and discovered the cracks when doing off-season re-build and not during a race.
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Old 02-16-2016, 11:43 AM   #280
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The wheel covers will come off in sharp corners because the tire flexes on the edge ofthe rim. That's one reason you see so many older AS and Avions with covers missing.
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