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 > Your search for posts made by 'CapriRacer' found 44 matches.

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  Subject Author Date Posted Forum
RE: 6 ply or 10 ply. Would I see a difference?

Most tire stiffness comes from inflation pressure. Have you tried a bit more - like +5 psi?
CapriRacer 06/07/21 05:30am Towing
RE: Nascar Follies

The problem wasn't the tires - or the traction. The problem was visibility. I am sure NASCAR learned some valuable lessons at COTA. I am also sure that road racing will be part of their future. Racing in the rain requires some different skillsets - and that includes the drivers, the crew chiefs, the sanctioning body, and the track.
CapriRacer 05/26/21 06:21am Around the Campfire
RE: Caster Question (Alignment) Again

I'm with Time2Roll. The camber looks excessive, but the toe (THEE most important setting) looks good.
CapriRacer 04/28/21 05:59am Class C Motorhomes
RE: Stupid question about tires

..... The only component of air that expands or contracts significantly differently than nitrogen alone is water vapor. ....... Sorry, that is not true. Water vapor behaves like an ideal gas EXCEPT near the dew point. Even a tire with liquid water in it will eventually lose all that water through the sidewalls, and become like the outside air - which is normally NOT near the dew point.
CapriRacer 04/09/21 05:05am General RVing Issues
RE: Stupid question about tires

...... All gases follow boyles law PV=RT. since V (volume) is constant, P is strictly a function of T (temperature) where T is absolute temp, E.G. room temp is 273 or so Kelvin. ..... X2!! Nitrogen behaves exactly like air when it comes to pressure buildup in tires!
CapriRacer 04/08/21 05:59am General RVing Issues
RE: Max Weight used to Balance Tires

Rotate the tire on the rim and re-balance ---I am NOT leaving here with that much weight hanging on a new tire, And it rotating the tire on the rim doesn't do it....get another tire After rotating the tire 180* it took 1 weight to balanceIf the installer knows his stuff he will line up the tire using the dots from the start. https://www.tires-easy.com/blog/what-are-the-red-and-yellow-dots-on-my-tires/That is what I thought as well. I've had to tell the person mounting the tires to line up the dots before. Good tire person will know this. Ah ..... Mmmmmmm ..... Not exactly. First, there is no standard as to what the dots on tires mean - or even if there need to be dots. Further, the valve stem hole in a wheel is almost always punched in a random location. The only other potential mark is a center punch mark, but it is rarely used and it's hard to find even when it is used. Ergo, matching dots on tires with anything on the wheels is almost always random matching - so why do it? (Note: It doesn't do any harm, but the average tire buster will quickly learn it's a waste of time and effort.)
CapriRacer 03/27/21 04:19am Tow Vehicles
RE: DOT Endurance Test for ST Tires NOT same for LT Tires

I would say that the manufactures of the tires run there own tests and pass that info along with the results to get the ratings. Otherwise how would they come up with them? I don't think they guess. This is just the DOT testing and most likely does not represent the actual testing the tires go through by the manufacturers when they are conceived. Allow me to confirm that tire manufacturers do their own testing, but they also do their own rating. DOT does only verification/ spot check testing. If they (DOT) find no issues, no one knows about the tests. If they (DOT) find an issue, they contact the tire manufacturer for clarification. And just to be clear: Since we are talking about ST and LT tires, the load table is set by the tire standardizing organization - The Tire and Rim Association - and the tires are tested against that standard. But for speed rating, there is an ATSM (SAE) test - again, conducted by the tire manufacturers for compliance to their published rating which DOT might test for compliance. And just an FYI, for ST tires, the speed limitation for unrated tires is 65 mph, but there is no published speed limitation for unrated LT tires. Yes, this is a bit of a conundrum.
CapriRacer 03/02/21 07:28am Towing
RE: DOT Endurance Test for ST Tires NOT same for LT Tires

As a tire engineer, I find this discussion thread very entertaining - and enlightening! Enlightening because of the misunderstanding many people have about tires and specifically ST tires. First is that not only were the DOT tire standards not changed until 2000 (because of the Ford/Firestone situation), but one of the criticisms of the DOT at the time was that they weren't updating the standards based on what was being learned. For example, it was obvious almost from the beginning of the DOT tire standards that the standards were not adequate to insure no tire failures (meaning not road hazard related failures!). It took nearly 40 years for the government to react - and it took a HUGE situation for there to be change. Plus, there is still no standard on tire aging. And don't forget, that when ST tires were introduced, many of the speed limits included travel trailers in the slower speed set for trucks. Yup, very entertaining.
CapriRacer 03/01/21 06:08am Towing
RE: What constitutes a "new" tire?

It is a commonly held belief within the tire industry that any tire within 6 years of the manufacture date can be sold as "NEW". I say "belief" because I know of no data that supports (or denies) this. 6 yrs or 6 months. I seriously doubt you could get a manufacture to go on record saying a 6yr old tire is like new. Also, are you talking about legally or realistically? Legally, new products that have not been sold before are considered "new". Find a dealer with a 1985 Ford Ranger that's been sitting at the back of the lot never sold, the dealer can legitimately sell it as new but realistically, they aren't going to lie and say it's a 2021 model. If you read the rest of the post, I said they TESTED the tires and could not find a difference after 3 years. They did not test beyond that because they wanted to set a policy of 3 years and wanted data to back that up. No, they didn't publish the data - it was for internal use. So what is the 3yr policy they were testing for? - Can't sell a tire that has set in the warehouse for 3yrs: In that case, it's a flawed test. It should then continue out for somewhere around 8-10yrs as the 3yr mark doesn't test the impact on end of life condition. - Buyers can use the tires for at least 3 yrs if they buy and mount them immediately after manufacture: Thanks for telling us the obvious. This story doesn't make sense. I think the key point you are missing is that tires age much more slowly when sitting in a warehouse compared to being in service.
CapriRacer 02/27/21 06:53am Class A Motorhomes
RE: What constitutes a "new" tire?

It is a commonly held belief within the tire industry that any tire within 6 years of the manufacture date can be sold as "NEW". I say "belief" because I know of no data that supports (or denies) this. 6 yrs or 6 months. I seriously doubt you could get a manufacture to go on record saying a 6yr old tire is like new. Also, are you talking about legally or realistically? Legally, new products that have not been sold before are considered "new". Find a dealer with a 1985 Ford Ranger that's been sitting at the back of the lot never sold, the dealer can legitimately sell it as new but realistically, they aren't going to lie and say it's a 2021 model. If you read the rest of the post, I said they TESTED the tires and could not find a difference after 3 years. They did not test beyond that because they wanted to set a policy of 3 years and wanted data to back that up. No, they didn't publish the data - it was for internal use.
CapriRacer 02/26/21 06:33am Class A Motorhomes
RE: What constitutes a "new" tire?

It is a commonly held belief within the tire industry that any tire within 6 years of the manufacture date can be sold as "NEW". I say "belief" because I know of no data that supports (or denies) this. However, the tire manufacturer I worked for did test 3 year old tires and could find no performance difference to freshly made tires. So not only is a month a deal breaker from the tire dealer's perspective, I doubt that the tire dealer could actually get a tire that fast through normal channels.
CapriRacer 02/25/21 06:51am Class A Motorhomes
RE: tire rim weight rating

The best research I have done says that there is no regulation that requires wheels to be identified by maximum weight carrying, or maximum pressure - BUT - wheels are designed and manufactured such that they will carry the largest weight for the vehicle they are fitted to - and that is controlled by the number of lugs. Yes, that's right, the number of lugs. Then that controls the weight limitations of the vehicle and therefore the wheel. Further, tire inflation pressure doesn't matter when it comes to wheel strength. It's the max load that overwhelms things to the point where stresses due to tire inflation pressure are trivial.
CapriRacer 01/26/21 06:38am Truck Campers
RE: Tire went flat in the driveay. Damage?

.... For starters, I would stop buying antique tires built up with multiple cotton plys. ;) ..... I'm pretty sure only a few people got that joke! Probably. Heck even the letter grades are outdated. They give the load ratings in pounds in the modern world and that's what counts. I think you mean Load Index. The load rating in pounds has been required for over 50 years - when tires came under federal regulation about 1970. Load Ranges were in effect at that time. And this is where it gets complicated. The Europeans came up with the idea of Load Index, but they still use Ply Rating, not Load Ranges. It's complicated because most tire manufacturers use all 3 on the sidewall (with some exceptions.) Not to mention that it is also a federal requirement to indicate what the tire is made out of (aside from rubber), so the sidewall will typically say something like: "Sidewall: 2 plies polyester Tread: 2 plies polyester, 2 plies steel, 2 plies polyamide"
CapriRacer 01/13/21 07:27am Towing
RE: Tire went flat in the driveay. Damage?

.... For starters, I would stop buying antique tires built up with multiple cotton plys. ;) ..... I'm pretty sure only a few people got that joke!
CapriRacer 01/12/21 06:49am Towing
RE: Tire went flat in the driveay. Damage?

I came out this morning and the left tire on my utility trailer was dead flat. Just came back from a 260 mile round trip, and it was up and fine when I went to bed last night. The valve stem failed catastrophically during the night. Glad it didn't happen on the road. Would the tire have sustained any damage from just going flat in the driveway? Tire is only 2 years old. The risk here is that there may be damage inside. The safe thing to do is replace the tire. If you reinflate the tire (do this carefully!!) and see sidewall ripples, replace the tire. If you reinflate the tire and don't see sidewall ripples, that doesn't mean the tire is good. It means you don't know!
CapriRacer 01/12/21 06:46am Towing
RE: Another tire question

My new trailer came with Load range H tires. Is that a problem?;) No, because a Load Range H inflated to Load Range E (or whatever) inflation pressure behaves like a LR E (or whatever). You might want to consider WHY you have a LR H on the vehicle. A bit more information would be helpful, like: Year, make, and model of vehicleWhat does the vehicle tire placard says about size, Load Range, and inflation pressure?Did you weigh it? What did you get?Make and model of tireWhat inflation pressure are you using now? How did you determine that?
CapriRacer 12/15/20 05:55am Travel Trailers
RE: RV parked for a lengthy period

The real problem here with tires is not the concrete. It's with the sitting. Tires can flatspot. The more load (less inflation), and the longer it sits, the worse the flatspotting. I've heard of tires flatspotting in 3 months. But the vehicle has sat for a year, so it undoubtedly has flatspots. What to do? First, move the vehicle forward or backward a half a tire revolution (4 feet?). That would put another flatspot 180° out of phase, which is better because the suspension reacts to a single flatspot worse than 2 flatspots. Or jack it put and rotate the tires 1/2 turn. Another would be to overinflate the tires - say 20 psi. No!!, the tire will not explode (unless it is damaged, but then it was going to explode sometime later anyway!)
CapriRacer 12/14/20 04:42am General RVing Issues
RE: Another tire question

There is an E speed rating, but in this case, it's referring to the Load Range. It's a way of designating how much load a tire can carry: For the same size, a LR E will carry more load than a LR D (albeit at a higher inflation pressure.) The old way of doing this was "Ply Rating" and the old 10PR = LR E - BUT - that confused many people into thinking that 10 PR actually had 10 plies! Not true, as a typical LR E tire uses 4 plies - 2 polyester body plies and 2 steel belts. The weight, sidewall stiffness. and RR of a LR E is only slightly worse than a LR D - and that's because LR D tires also have - typically - 2 polyester body plies and 2 steel belts, just a bit stronger. That means you shouldn't worry about using a LR E in place of a LR D - the differences are minor.
CapriRacer 12/13/20 06:25am Travel Trailers
RE: Replacing 1972 16.5 Inch Rims Advice

Here's a link that might help: Barry's Tire Tech: 16.5" Tires
CapriRacer 12/11/20 06:30am Tow Vehicles
RE: E rated tire with max psi of 65?

...... While you SAY burst pressure the reason, then add that burst is many times the max pressure, it would seem that 80 psi rather than 65 psi, would not cause burst. ..... What's really going on here is fatigue strength. Wikipedia: Fatigue (material) Tires are all about fatigue and in order to design a tire to go through 10's of millions of cycles (rotations), the designers uses the burst pressure as a reference and then uses a factor to increase the strength to get the desired fatigue life - which they get from an S-N Curve for the material in question. So while tires don't burst at 80 or 100, or 150 psi, that burst pressure is an indicator as to the fatigue life. Good to see where your info comes from. While there are many types of tires, if you would have taken the time to read the link Burb posted, it is a hybrid type (dual purpose) tire, that by design, would work best, considering sidewall and tread at 65 psi. Other tires purpose will vary, and while e-rated, may also be less than 80 psi. ...... Ah .... That's not how it works. The simplest way to describe this is to say: 1) that the WORST condition is the onroad condition, because heat is the tire killer! So the fact that we are discussing an onroad/offroad tire still means the onroad condition is what the tire engineer has to design against. 2) that the tables were set up (over 80 years ago!) so that a construction for a given Load Range works for all tire sizes - which means that when a tire gets to a certain size, it can't withstand the stress, so the Load Range drops down to the next lower increment - in this case from 80 psi down to 65 psi.
CapriRacer 12/04/20 04:57am Tow Vehicles
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