Tireman9
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Re: ST Tire "Plies" Question and a PSI Question
Dayle1 wrote: Tireman9 wrote: comments and advice deleted by author. good luck and safe travels. The only part of this that I have a problem with is ST tire life. If ST's are designed for the unique sheer loading of trailer use, then they should be capable of surviving for more than 3-5 yrs. And if sheer loading is the primary issue with trailers, it would also seem that LT tires used on trailers should have inferior life expectancy compared to purpose designed ST tires. And if LT users are more likely to inflate their trailer tires based on weight while ST users are more likely to inflate to max PSI, then that would further imply worse reliability when using LT tires on a trailer. Yet there seems to be very few issues with using LTs on trailers. A few yrs ago at a rally I checked the tire stickers on every TT and fiver at the rally. 1/3 specified ST tires, 1/3 specified LT tires and 1/3 did not specify either. Furthermore, most of the ones specifying LTs were heavier, expensive units like DRV. Now if ST tires are really engineered for higher load and specifically higher sheer load, then how could these rv manufacturers specify LTs and not STs?? comments and advice deleted by author. good luck and safe travels.408Views0likes0CommentsRe: ST Tire "Plies" Question and a PSI Question
BFL13 wrote: If STs are to be kept at full pressure even when the weight doesn't require it, but LTs' pressure is adjusted for the weight, then it is more likely the LT would not be at full pressure. So that would be fine for the weight but not so good for the sheering? Should the advice to be at full pressure despite the weight also go to LTs when mounted on trailers to help with the sheering? comments and advice deleted by author. good luck and safe travels.408Views0likes0CommentsRe: Quest. Re. Tires...Yes, I know...another one!
PastorCharlie wrote: Tireman9 wrote: goufgators wrote: My tires are Goodyear 245/70R/19.5. After weighing, I'll be running 90 psi in each tire. I see on the Goodyear Load/Inflation Chart that there are some weights that are in bold print with a letter following: For example: 4080(F). I assume the "F" is a 'load rating' ??. My tires, however, are "H' rated which is not even shown on the chart. Are these letter ratings indications of the tires number of plys? Also, do I ignore the fact that my "H" rated tires are not even shown on the chart and still go with the 90 psi indicted by actual weight? Thanks, Larry comments and advice deleted by author. good luck and safe travels. At what ambient temperature should that adjustment be set if one drives from -30F to 90F? comments and advice deleted by author. good luck and safe travels.336Views0likes0CommentsRe: ST Tire "Plies" Question and a PSI Question
CapriRacer wrote: Well, no one addressed the OP's other question - and that is WHY there is a difference in the number of plies between the 2 tires. First, the nylon cap ply is there to reduce the stresses in the belt edges - and that slows down the appearance of a belt leaving belt type of separation (what is commonly called a tread separation). But it is possible to improve the resistance of the belt edges to separation by changing the rubber compound and the thickness of the rubber between the belts. In other words, there is more than one way to cook a goose. So why is there word out there that Carlisle trailer tires have a cap ply? They could have had one at one time - AND - it might be that some sizes have them and some sizes don't. comments and advice deleted by author. good luck and safe travels.408Views0likes0CommentsRe: Quest. Re. Tires...Yes, I know...another one!
Ray,IN wrote: The Rubber Manufacturers Association (RMA) has information that conflicts with tire mfgrs. load/inflation charts. This RMA pdf, ch 4 is for RV's, page 55 states "However, never use inflation pressure lower than specified by the vehicle tire placard, certification label or owner’s manual. Nor should inflation pressure exceed the maximum pressure molded on the tire sidewall." comments and advice deleted by author. good luck and safe travels.336Views0likes0CommentsRe: Quest. Re. Tires...Yes, I know...another one!
goufgators wrote: My tires are Goodyear 245/70R/19.5. After weighing, I'll be running 90 psi in each tire. I see on the Goodyear Load/Inflation Chart that there are some weights that are in bold print with a letter following: For example: 4080(F). I assume the "F" is a 'load rating' ??. My tires, however, are "H' rated which is not even shown on the chart. Are these letter ratings indications of the tires number of plys? Also, do I ignore the fact that my "H" rated tires are not even shown on the chart and still go with the 90 psi indicted by actual weight? Thanks, Larry comments and advice deleted by author. good luck and safe travels.336Views0likes0CommentsRe: MH tire PSI conflicting info
Cmore12 wrote: After reading here, I went to the Tiffin forum. There is a 3-page EXTENSIVE post/responses set on this. Here's a "short?" bullet point summary: 1. 4-corner weighing is the best info. Done at rallies, etc. Must be level. 2. Weighing left side/right side & do the math at a CAT scale is NOT OK. 3. If just weighing axles, add 5% weight, then consult the manufacturer's chart and add 5 psi. This is conservative enough to make up for unbalanced sides. 4. Each axle MUST have same pressure side to side. Use heaviest. 5. This changes my numbers to 81 psi front & 86 psi rear. That's 25+ BELOW what the dealer put in. 6. Over pressure a bit is OK. 7. Under pressure is dangerous. Smarter folks than me have beat this to death, but this is in line with the consensus of posts here. Cheers, Me, my Honey, & two dogs cuter than yours comments and advice deleted by author. good luck and safe travels.337Views0likes0Comments
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