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tireman9

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    Akron, OH
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    Genealogy, Travel out West. Tires
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  1. As I understand how Centermatic system works you must be at some speed (more than 10 to 20 mph ?) for the rings to come into balance.
  2. tireman9

    Odd Tire Wear

    With a weight 13,820# I suggest you assume a 47/53% load split as a perfect 50/50 is very unlikely So 53% gives 7,325# which gives 115 psi according to the tables. ( You always go up in inflation) I also suggest a +10% on inflation but not exceed tire sidewall number so that means 120 psi cold. You will not find a "4 corner" scale except at FMCA Int'l conventions and some other large RV events. You can also contact RVSEF to check their schedule. You can also check with local sand & gravel companies, Concrete companies and some building supply companies. Here is the work sheet you will need to calculate your own 4 corner weights
  3. Need to jump in here. Starting in 1972 I worked on a number of different "Advance Tire" projects Some were looking at an "aftermarket" device that could be placed inside a tire to offer some "Run-Flat" capability. Foam Aluminum and foam Urithane were used. These worked but were too heavy and expensive for general use by the trucking industry and they were not willing to pay the penalty of the original cost and the loss of load capacity for the truck. Visually they would resemble the Rettroband. Here is a picture of a similar device. Having watched the Rettroband video it appears they have a unique method of "attaching" the ring which was one of the areas we did not finalize. I was also the project leader on the original "Run-flat" tires applied to the people mover train at the then-new DFW airport. This approach involved filling the air chamber with a rubber foam material (not urethane but flexible rubber) I believe that this is the approach used on some military vehicles today. This is not some secret "magic" stuff that is being kept from public use by the military as some have suggested and it is not some "Area 51" SiFi material. Just rubber with a blowing agent. If you were willing to spend maybe $500 - $1,000 a tire, limit speed to an average speed of 25 - 30 mph and do a complete redesign of your front suspension to handle the 150 to 200-pound increase in tire assy weight, I believe you can have this on your vehicle. Oh, you also would need to be willing to scrap the wheels when your tire wears out and you can not dismount a foam-filled tire. Other "run-flat" military systems use a flat base multi-piece wheel with an internal ring along the lines seen here. Note how the flat base multipiece wheels are assembled. Other approaches involved going from 22.5 wheels to 26.5 diameter wheel while retaining the same OD, width and load capacity as the original 11-22.5. We even had about 600 special wheels manufactured and we applied these wheels and tires to hundreds of HD trucks. I posted info on my tire blog about these tires. The problem with these tires is they needed new wheels. While these tires provided significant improvements in vehicle control with a sudden loss of air on the front. the trucking industry did not feel the improved safety outweighed the increased cost of new wheels. The Tyron system does not appear to offer any support of the tire tread or feature to limit the "drop" which IMO is an important feature of limiting the degradation or loss of vehicle control due to "blowout" but is intended as I understand it to prevent the flat tire from being dislodged from the wheel. Regarding the questions of lost air volume. No observable change in vehicle ride was noted with the change from 22.5 to 26.5 wheel diameter due to the lower air volume. If you are wondering about the effect of load on air volume you can do a simple test yourself. Inflate a large tire to a specific level and with the tire off the ground with floor jacks record the inflation with your TPMS. Then lower the floor jack and record the inflation when loaded. You can then post the results of your test on this thread for us all to see,
  4. Probably the extra cost which is how the RV industry works IMO.
  5. Based on the work I did on placing devices inside tires I am not aware of any problems as long as the normal operation deflection does not result in the interior of the tire contacting the device. While I do not have the data it appears that the clearance is in the- 3" range. Normal tire deflection when a tire is properly inflated for the load is in the 1" - 2" range. I did watch a video on a tire being mounted and while there are some steps that need to be followed I don't see why damage would occur if the instructions were followed.
  6. tireman9

    Odd Tire Wear

    I don't see where the actual fully loaded "4 corner" weight. Some input from a Michelin contact I have is suggesting the possibility if incorrect inflation for the actual load. Could you post your 4 corner weights and your cold inflation numbers.
  7. I am running a direct comparison of two different TPM systems (Tire Traker & TST) Early results have been posted on my blog. I am not aware of any other direct real-life comparison. (If anyone knows of such I would appreciate hearing about it. I also, in my working life as a tire engineer, started working with TPMS in 2002 In general, it appears that most systems being offered today (in FMCA magazine and at FMCA Conventions) are similar in design and function. I might suggest that you consider the warranty and the information provided on the company website and if they have a phone number.
  8. I purchased Tire Tracker for my first RV back in 2009. I like the long battery life (days) of the monitor, user-replaceable batteries and the Lifetime Warranty of their current system. Also the ease of programming and the "early Warning" pressure levels. Lower cost is nice too.
  9. tireman9

    Odd Tire Wear

    Having a US Patent on directional tread design, in my professional opinion if it was "directional;" it would certainly "look" directional. Another item is that at 22,000 miles if there was some directionality to the pattern initially it appears to have been worn off. I also note that Michelin does not list Directional design as either a feature or benefit so very unlikely.
  10. I saw the Rettrobandat Minot. Not the same as Tyron. Tyron "fills" the well of the wheel to try and prevent the tire from coming off the wheel. Appears to be smaller in OD than the wheel. Rettroband is larger OD than the wheel and decreases the amount the tire "drops" and appears to allow better control after the tire loses air. Back in the '70's I worked a bit on something like Rettro in concept but slightly different design and mounting. I have not personally tested the Tyron or Rettroband so above is based on observations only.
  11. tireman9

    Odd Tire Wear

    The driver front has one side of the tire toward the center line of the RV and the other side of the tire is facing the road. If you change the direction of rotation of that tire by dismounting the tire from the wheel then re=mounting it on the wheel that will change the direction of rotation as Brett mentioned.
  12. tireman9

    Odd Tire Wear

    If uniform 360° around I would say not a belt separation but the tire design is sensitive to alignment. I am checking with a contact at Michelin. RE rotation. After alignment is checked and adjusted you could swap by changing tire inside to outside assuming the wear is only on one side to the one tire. Sorry for slow reply was in NY Letchworth St Pk last week not poor cell reception No reception, no bars on two different phones.
  13. tireman9

    TIRE Balance

    In general tire companies do not want any "stuff" on the inside of tires as some "Balance Beads, sand or powder" as some call it, may abrade the interior. It is also important that you change the tire valve as the material placed in the tire can clog the valve core or even disable a TPM sensor. The "bean bags" break-up and the lose "beans" spread out inside the tire. I expanded my post about "stuff" on the inside of tires as some materials are in liquid form and that would be sealants and possibly even some balance "stuff". These materials can coat the interior of a tire and make applying a tire patch (nail hole repair) difficult or impossible to reliably stick to the tire so if you put some materials on the inside of a tire and later on pick up a nail and need a patch you may be disappointed to be told the tire store is not willing to attempt a tire repair.
  14. tireman9

    TIRE Balance

    Before you use anything on the inside of your tires, be sure you confirm that it doesn't void your warranty. Sealants can make a tire un-repairable as the sealant material can prevent proper adhesion of the patch to the inside of the tire.
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