tireman9

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About tireman9

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    http://www.RVTireSafety.Net
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    Male
  • Location
    Akron, OH
  • Interests
    Genealogy, Travel out West. Tires
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    Part-time

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  1. Tire Pressure vs. Axle Weights

    Yes, Michelin doesn't do us any favors with their Load & Infl tables. They know that individual tire loads are important and that you should inflate all tires on any one axle to at least the pressure specified for the tires with the heavier end but then they go and make stuff complicated by publishing axle loads. I suspect the reason for this is that their tables are aimed at truckers who only do axle weights because their loads are more balanced side to side than RVs. You can do yourself a favor by writing down your own version of Michelin numbers but show the load per tire for fronts and per set of duals for the drive position as the rest of the tire industry does. You can confirm you did the math correctly by looking at a Goodyear or Bridgestone or other truck tire chart. The numbers should be the same or almost the same as in the Michelin table. (The reason for the minor differences can be confusing so just accept that the French have their way of thinking) Minimum inflation. You are correct to not run lower than the lowest number on the table. Just be sure you compare to a different company chart to confirm your math. RE "Engineers" I sometimes wonder if the RV companies have Automotive or similar engineers involved in the design of the coach part of a motorhome. The chassis does, I'm just not sure about the coach based on some of the stuff I have seen in RV coaches and trailers.
  2. Question About Aluminum Wheels

    Chrome platingAluminum takes some special processing as Chrome doesn't stick to Aluminum. You first plate with Copper, then Nickel then Chrome and the process in the aftermarket can be quite expensive. There are spray on clear wheel "paints" that I have used. You first clean & polish your wheels then spray the clear coat. You do need to remember that any abrasive cleaning will damage the clear coat so be careful.
  3. Tire Pressure

    I only use a hand gauge when adding air at the start of the season or if I have had a drop in pressure of more than 10%. I know this is OK as I use my TPMS "Morning Reset" feature at the start of each travel day. This sets my TPMS readings on the monitor to 0 PSI and 32°F. I then go get my coffee and after a few minutes, I have the current CIP readings. (Side note) I have learned that if I have a slow response from a sensor it is an indication the battery is getting old so I just put replacing the battery on my to-do list for the next day) Since my CIP is set to be the minimum inflation based on my heavier ends, of each axles + 10%. I have a built-in margin so have learned that +/- a few psi is normal. Since psi of air and N2 changes by about 2% for each change in temperature of 10°F. I know that the Ambient temperature would have to drop by 50°F or more before I would need to be adding air. The availability of TPMS has actually created a bit of a problem as folks now know their tire pressure and temperature so since they have little or no experience with what they have been running for the past 5 or 20 years then get un-necessarily worried when they see the pressure change by a couple or even5 psi. NOTE I am talking COLD pressure (CIP) measured with a pressure gauge that is accurate to within +/- 3% of your CIP. Tire engineers know that tire temperature and pressure will increase with running. maybe even as much as 20 to 25% if you run heavy and fast. You are not going to get a "Blowout" from the normal pressure increase unless you have somehow severely damaged your tire. Most street tires I know of can handle a 50 to 100% pressure increase. I suggest you read this post if you are still concerned.
  4. Tire Valve Stems

    Only Aluminum stems I know of are either racing stems or the stems on some passenger car OE TPMS. These are subject to corrosion and are not as strong as brass stems. Don't know of any normal auto part store or truck stop selling Aluminum racing stems. They definitely are not as strong as Brass. Unless you are running at Indy, F1 or in an ultra small light weight car I don't see the lower weight as an advantage. I never rant them in any of my race cars. Please be aware that some truck stems are the "yellow" brass color while other brass stems are simply chrome or nickel plated to make them loop nice.
  5. Tire Pressure

    NO Wheel pressure is CIP Not the hot pressure. Basically, the 120 would match up with the tires that would be applied to the Rv using those wheels. Might be a couple different sizes but in each case, the tire is rated for its max load AT 120psi. Wheels like tires are designed to tolerate normal pressure increase. Side comment on your TPM readings. I recently did an evaluation of TPM pressure accuracy. Results HERE. TPMS are designed to warn of pressure drop. If you did a test with your system and could let out an identical amount of air I bet you would find that all 6 of your sensors would give a warning when they lost the same number of pounds (+/- 1 or 2 psi) Bottom line. All this variation might be "Measurable" but the differences in the numbers are not really "Meaningful" You can get a better understanding of these two terms HERE. Hope I was able to answer your questions. I may not always be available for quick answers but I bet that just about all the questions folks might have on tires in RV use have been covered in my blog which is available 24/7
  6. Tire Pressure

    First off I would not be concerned with the numbers you have. Tires normally change temperature pressure by about 2% for each change in temperature of 10F. The only pressure I am concerned with is the CIP or Cold Inflation Pressure. If you have that correct for your load the increase can easily be tolerated by your tires. You can see the Science for the pressure change in my blog. I covered the temperature effect in three posts HERE. Gotta run the DW just called me to dinner. Will post a bit more in about an hour.
  7. Goodyear Tire Blowouts

    Didn't your TPMS provide a warning of the air loss? Have any clear pictures of the tire? True "Defects" usually occurs at early mileage. Do you have your tire scale readings? What size and what is your Cold inflation pressure?
  8. new radial rear tires

    While I never personally ran wheel tests, I do recall reading some technical reports back in the 70's talking about the stress loading on wheels of radials being different than from bias tires. "Different" doesn't mean higher but the loading on wheels is much more complex than many people realize. Might be greater in one area and lower in another. Few people realize that the "disk" portion (the part that bolts on) actually functions much like a Bellville washer and if you pay attention you can see the distortion when torquing passenger steel wheels. The rim portion also transferred loads differently from the tire bead to the disk so yes wheels can be rated "bias only". The same axle warning is not based on the wheels but on the lateral deflection difference so one tire may get a disproportionately higher level of lateral forces.
  9. Sealant options

    I understand the Eternabond tape is good for seams that need something to hold the seam together but if you just want a bit of extra waterproofing like around the ladder feet that attach to the roof why wouldn't 100% silicone seal be OK? Comes in smaller, resealable and less expensive container than Dicor. Have also wondered about "Flex Seal" as advertised on TV ? Thoughts
  10. What is the proper ratio of Bleach to water? 1 cup per 5 gal capacity?? 1 cup per 15 gal capacity ?? I have heard both. The Class-C was drained and had antifreeze over winter. Was drained but not flushed when I left campground after Perry in March. Want to sanitize and flush before I head out in 3 weeks.
  11. 19.5" Michelin XRV's Discontinued

    From experience, I know that some items are discontinued simply because the volumes do not justify carrying inventory. Tires are made in batches of a few hundred to continuous runs of thousands a day. If you only make a run of say 500 tires how can you properly stock your warehouses? If you only sell a couple thousand a year or maybe only 500 a year, how can you justify disrupting the production of an item you make and sell at hundreds a day? There is a lot of lost downtime of very expensive equipment when there is a change in a production run. How often do you want to shut down a building machine that has a 10 tire output per hour when it might take 2 hours to make the change over? These machines can cost $250,000 to $500,000 each and tire production is 24/7. Then there is the QA requirements. If an item is out of production for a long enough period of time the plant may need to run additional QA checks which can cost the company $thousands in testing and analysis plus the destruction of a number of tires run on the tests or simply cut up to confirm proper machine set-up.
  12. new radial rear tires

    I don't think he was. Kiltedpig just didn't read the complete tire size. He did what many do. I get numerous questions such as. " How much inflation should I run in my 262R22.5 tires or similar abbreviations or typos.
  13. What tire if price no concern

    The Big 3 have "company stores" that work together with their inventory. You can check dealer location from the corporate website. Goodyear, Michelin, or Bridgestone. Firestone uses same stores as Bridgestone and Dunlop would share Goodyear and Uniroyal with Michelin. I would just go to the company website for the brand you run or are interested in and look for the link on "Dealers" or "Store Location"
  14. new radial rear tires

    While the question of Radials has been answered. I would suggest it would not be good to mix radials and bias tires on the same vehicle as the steering (oversteer/understeer could be different than what you are used to. It is of course NEVER good to mix radial & bias on the same axle as the side motion of the more flexible radials could cause problems with the bias tire.
  15. New Tire Pricing & Load Range Advice

    Sorry but I do not agree with the concept that running 110 PSi in a LR-L would be "unsafe and result in excessive flexing and heat. This assumes you are running the correct inflation based on your measured load. While not the same product I have been writing in my BLOG about what inflation to run when you change size or LR