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 > Your search for posts made by 'CapriRacer' found 24 matches.

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RE: Michelin Cross Climate C Metric Tires

This is one of those quirky things. C type tires are a European based tire standard, where LT tires are a US based tire standard. Normally there is very little difference between European and US tire standards, but this is one of those exceptions. Michelin is not the only tire manufacturer making these kinds of tires, but they are hard to find. Even looking on Tire Rack's website doesn't bring them up on a size search.
CapriRacer 12/15/21 11:55pm Class C Motorhomes
RE: Max Pressure Cold vs Hot Pressures - How Much Is Too Much

I'm just curious.... if the chart is gospel, why go 5psi above what the chart recommends? Mike Actually, the chart is a MINIMUM! Even says so! (Load Limit)
CapriRacer 11/22/21 06:00am Fifth-Wheels
RE: Max Pressure Cold vs Hot Pressures - How Much Is Too Much

My Carlisle CSL 16's have a cold max pressure of 110. I installed a TPMS the same day I bought them. I read up on these tires and there was nothing about a hot max pressure from Carlisle. I contacted Carlisle and they said there was no "hot max" specified. So on the maiden voyage with them, I watched the temps rise and rise above 110 to just under 120. The tires on the sunny side were uniformly higher than the ones in the shade side understandably too. I read elsewhere that a different manufacturer emphatically states on their website regarding trailer tires to NEVER bleed down HOT tires. So it begs the question, how much hot pressure is too much? The TPMS system instructs to set alert levels that are pretty high. What do you think is an acceptable pressure level hot relative to the cold max? First, the burst pressure of tires is many times the max pressure listed on the sidewall. In this case we are talking over 300 psi! Yes, you read that right! (Be aware that a road hazard is NOT bursting the tire! It is damaging it! So that can occur at ANY pressure!) Second, Rule of Thumb is that the increase in pressure from cold to hot shouldn't be over 10% (excluding ambient temperature effects.) In this case a 110 psi tire shouldn't exceed 121 psi (excluding ambient temperature effects!) If you exceed 10%, then you need to do something about increasing the load carrying capacity of the tire = more pressure, larger tire, slowing down! If you exceed 15%, you need to do this IMMEDIATELY as that tire is going to fail fairly soon! Ambient Temperature Effects = 2% increase for every 10°F increase in ambient temperature. So a 110 psi tire set in the morning when it is 50°F, in the afternoon at 90°F will be at 115 psi, just due to the outside temperature. I know I read it on one of the Tire MFR's sites, but don't remember which, but what I remember was trying to set the tire pressure at an ambient temp of 70 degrees. When temps are in the mid 50s the pressure will be approx 10 to 15 Lbs below the set pressure, but within a few miles rolling down the road they will be at the set temp and continue rising as the continue heating up. No!! That is wrong! You set the pressures to the ambient conditions, whatever they happen to be. The only exception to this is in winter where the ambient temperature is going to be LOWER than when you set it, and you use the "2% for every 10°F" rule while estimating how cold it is going to get. ***************************************** An important thing to remember is that UNDERINFLATION is bad, where over inflation only causes minor issues! In other words, pay attention that you have ENOUGH pressure in your tires, but don't be paranoid about having too much.
CapriRacer 11/19/21 05:49am Fifth-Wheels
RE: Nascar Follies

I suspect that Denny was thinking that he (and other playoff drivers) should get some respect - meaning cut them some slack. There are 2 things wrong with that: Denny was already in the final 4 when that happened. I haven't heard if Alex knew that or not, but I am sure Denny knew! Denny has been on the giving end and should expect that folks racing him for the win are going to race him in the same manner. The fight had been on for 15 laps - and cleanly. He should not have been expecting it to last.
CapriRacer 11/03/21 05:53am Around the Campfire
RE: Tires - The 10 Year Rule

DOESNT the speed of what you cruise at AND PROPER air pressures determine much of this ? And OTHER THINGS to consider is ... that all this is just a tire company GAME to sell more tires. AND WHY ... don’t tires last way WAY longer than the yesterYEAR ones did ? Yes, there are a lot of variables when it comes to tire aging - operating speed and inflation pressure among them. The one thing that has yet to be mentioned is locale. Heat, in the form of ambient temperature, plays a HUGE role in how long tires last. Obviously tires operating around Phoenix experience a lot more heat history that tires operating around Minneapolis. So if you live and/or operate in the desert SW, you need to use a more rapid replacement schedule than someone living/operating in the northern midwest. And why don't today's tires last longer? 1) Law of Physics (and Chemistry) don't change over time. 2) They didn't, but we have the Internet today and that changes how people perceive things. 3) Then there is this odd thing that our brains do: We think the Good-Old-Days(TM) were better - somehow. Actual statistics don't bear this out.
CapriRacer 10/12/21 05:10am Class A Motorhomes
RE: Heavy Class C Tire thoughts

Sorry to say but all E rated tires of a certain size by any brand have the exact same max load carrying capacity when inflated to 80 psi. Actually not. You can see from the Michelin load tables that the dual application of the C-Metric 225/75-R16C has 1000 lbs. more per pair or 2000 lbs. more per 4 rear tires at 80 psi. 5950 vs. 4940 lbs. per pair. https://www.rvsafety.com/images/pdf/michelinloadandinflationrvtruck.pdfBut the Michelin 225/75-R16C is not an E rated tire. You are trying to compare apples to oranges. So what Load Range do you think it is? It says right in the table it is an LRE. Perhaps I can explain this. First, whemme is mostly right, but he could have worded it better. But RambleOnNW is sort of right, too - and he also could have worded it better. What is going on here is the difference between tire standardizing organizations. Whemme is referring to LT tires (US based standard) and what RambleonNW is referring to are C type tires (European based standard). They use the same number for the tire dimensions, but they use different formulae to figure out the load carrying capacity. Technically, LT tries (US standard) come in Load Ranges, while C type tires (Euro standard) come in Load Indices (not load ranges). But tire retailers aren't quite this savvy, so they fall back on what is familiar - Load Ranges - and label these C type tires with Load Ranges (incorrectly!) I hope that explains things.
CapriRacer 10/03/21 03:34am Class C Motorhomes
RE: Tire pressures matter....lol

Exactly Grit!! I schooled your tire jocky buddy (C Rer), on this very issue. I know tire max load may be reached at near door sticker pressure, but with heavy tongue wt, more air is better, usually tire max pressure, as marked on the sidewall of a 1/2 ton truck. I challenged him, to borrow a trailer, since he didn't own one, take it for a tow, with 1K+ hitch wt. Now air his tires to max pressure (51 psi, IIRC) take it for a tow, and report back. He did finally admit, that some more air might be better, but I don't think anyone trusted him to tow their trailer. I am referring to max sidewall pressure on truck rear, and a bit more than door sticker air on the front of a 1/2 ton, when towing a 7K+ GW trailer. Jerry If you are referring to me, then I call BS on this. 1) I towed a racecar for 5 years. 2) I never use max pressure - mostly because I know how that figure is derived and that it has doesn't have the meaning you think it does. 3) A little extra pressure over the vehicle tire placard will make the vehicle feel more responsive. Might it be helpful when towing? Sure! But I am talking 3 to 5 psi, not the max listed on the sidewall.
CapriRacer 09/25/21 07:25am Tow Vehicles

The DOT code is a 10 to 13 digit "number" on the sidewall of every tire that hits the street in the US. I go into more detail here: http://barrystiretech.com/dotcoding.html The complete DOT code only needs to be on one side, but a partial code is required for the other side - and that one will be 6 to 9 digits long. Tires that do not hit the street are NOT required to have a DOT code, but many do, and they are NOT required to follow the DOT coding format. Sometimes the tire manufacturer will have its own coding system - as did even street tires prior to the early 1970's.
CapriRacer 09/19/21 06:48am General RVing Issues
RE: Why do I keep blowing out tires on my truck?

Allow me to explain the side to side vs cross rotation thing - from a tire engineer's perspective. First the front tires do different things than the rear tires - so they wear differently. There is a slight difference in what happens on the left side vs the right side, but not nearly the amount compared to the front/rear thing. Ergo, it is OK to rotate tires front to rear, and it would be slightly better to cross rotate. But in the past, there was a specific recommendation from tire manufacturers to only do front/rear rotation. That's because in the early days of steel belted radial tires, the adhesion of rubber to steel wasn't very good and small separations would appear adjacent to the steel wire on one side. The thought was that by keeping the direction of rotation the same, the risk of the separation occurring in the other side was reduced. I never bought into the theory because I this is all about torque and tires experience both braking torque and acceleration torque. Well, those days are long gone and rubber to steel adhesion is sooooo much better. Separations around the steel wire are non-existent in normal production. Yeah, there are sometimes where the adhesive materials aren't up to par, but those are relatively rare and caused by a problem in mixing the rubber. A change in rotation practice won't cure that!
CapriRacer 08/02/21 06:04am Tow Vehicles
RE: Tow vehicle tire size not to spec

I'm looking to replace the tires on my tow vehicle (2010 Ford Expedition) and I was surprised to learn that my existing tires do NOT match the tires specs on the vehicle placard. I don't know when or why that happenend. Anyways... Placard specs are P255/70R18 Existing tires are P265/70R18 So my existing tires are 10 cm wider than what's specified. Is that a bad thing? Or just a "thing?" My Expedition is no champ for gas mileage, but does that extra 10 cm per tire take the mileage down significantly? In your opinion, should I return to specs when I replace the tires, or is there a compelling reason to stick with the wider tires? Sometimes the OEM supplies wheels that are barely wide enough for the specified tires. That would mean that upsizing a tire might result in more center wear. But that is not the case for your vehicle. It came with 8.5" wheels and a P265/70R18 can be used on up to a 9" wheel. Fuel economy? First, tire rolling resistance varies a lot between make/model - much more than mere tire sizing changes do! Secondly, the 265 has a larger diameter which should help fuel economy. Thirdly, Worn tires have less rolling resistance than unworn tires do - all other things being equal. So expect a loss of fuel economy when you change tires.
CapriRacer 07/30/21 05:27am Travel Trailers
RE: Tire engineering question.

Sorry, but in my mind a blow-out is a tire failure. ..... Be careful here. Tires can "blow out" due to road hazards. That's not the fault of the tire. It's just one of those things. If you always blame the tire for a blow out, then you'll be trying to fix a problem that doesn't exist. That could get expensive.
CapriRacer 07/15/21 06:17am Tech Issues
RE: Maintaining air pressure in your tires

A while back I stumbled upon an article that indicated the schrader valve isn't supposed to be the main device for holding air in a tire, the cap is. I always buy metal caps with rubber seals just in case the schrader starts leaking. As a tire engineer, allow me to correct a few things. First, the Schrader valve IS the main device holding in the air. The metal cap is a back up. And I recommend using the metal cap.
CapriRacer 07/02/21 06:42am Class C Motorhomes
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
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