Re: Tires Reply #225 – May 19, 2017, 02:52:15 pm Millions of truck tires go millions of miles each year without a problem. They don't overthink inflation....just like those videos said, they top them off. Quote Selected 2 Likes
Re: Tires Reply #226 – May 21, 2017, 12:27:32 am Quote from: Dave Katsuki – April 30, 2017, 10:58:06 pmJust put on 6 Toyo M154s, but no experience with them yet (they were fine driving 20 miles back from the tire dealer ). Will report back when we move north.Well I got experience with the 295/75R22.5 M154 Toyo's from Tucson up to Prescott, and unfortunately the front tires were rubbing the airbag platforms (and the airbag when it was compressed going around a corner.) The outer edge of the tires rubbed the rear airbag platform when turning at about 1/2 cut - e.g. on a right turn, the outer edge of the right tire rubbed the rear platform pretty badly at about 1/2 cut, and even if I could have adjusted the relief valves to restrict the steering angle enough, I wouldn't have been able to get around normal corners.So I went back to Michelin 275/80R22.5 for the front (got X Line Energy Z's LRH), and worked a deal with the dealer to buy the two almost new Toyo's. The Toyo's on the back are fine, of course, and will provide lots more traction if we need it. Quote Selected
Re: Tires Reply #227 – May 21, 2017, 01:41:23 am The 270 must have different clearances as our '99 320 has no issue with 295/75/22.5 on the front. Quote Selected 1 Likes
Re: Tires Reply #228 – May 21, 2017, 04:00:30 am Yeah, I was surprised too, since folks said no problems with the wider tires. Comparing the Michelins with the Toyo's on the front, I found that the Michelins feel tighter, especially responding to varying side wind, so I'm pleased with everything except for the extra $$. Quote Selected
Re: Tires Reply #229 – May 21, 2017, 08:29:07 am Very strange how critical less than an inch width is.295/75-R22.5 vs 275/80-R22.5 Tire Comparison - Tire Size Calculator | Tacoma... Quote Selected
Re: Tires Reply #230 – May 21, 2017, 08:31:50 am Remember, cut angles ARE (easily) adjustable on the Sheppard box. Of course if it hits at 1/2 of full cut angle.......... Quote Selected
Re: Tires Reply #231 – May 21, 2017, 10:32:35 am Our Cooper 295/75-22.5s rub on the front air bag bottom plates during certain turns but don't do anything other than polishing the plate. Rear is not close. The 295/75s are about .75" wider than the 275/80s but the diameter is almost exactly the same. As Brett says, cut angles are adjustable. I can't see any marks on the tires from occasionally touching the plates in about 8 years.The tire size calculator numbers will be slightly different from brand to brand.Tire response will vary depending on brand and even different tread patterns in that brand.Pierce Quote Selected 1 Likes
Re: Tires Reply #232 – May 21, 2017, 10:47:15 am Dave, Sorry to hear about tire rub. Seems we all want to get as much tire under our coaches. We too have Toyo's, except we have the Model M177 295/75-22.5. They do not rub and we have over 1000 miles on them. They do get very very close in the front. We will continue to inspect for any rubbing.John Quote Selected 1 Likes
Re: Tires Reply #233 – May 21, 2017, 11:29:36 am Ditto to above,have about 6K on mine,no rubbing. Quote Selected
Re: Tires Reply #234 – May 21, 2017, 11:32:38 am ....no rubbing with my Toyo's on my 270, possibly tread design difference. Had slight rub on my 280 with 295/75 Goodyear's. Quote Selected
Re: Tires Reply #235 – May 21, 2017, 11:38:06 am Is the area that is rubbing structural, or could it be filed down just a little to allow sufficient clearance? Quote Selected
Re: Tires Reply #236 – May 21, 2017, 12:44:37 pm Quote from: wolfe10 – May 21, 2017, 11:38:06 amIs the area that is rubbing structural, or could it be filed down just a little to allow sufficient clearance?It's covered when the bags are deflated but exposed when at operational height. It has a radius to it so with the coach going forward, the tire does not touch any sharp edges. With normal highway or city turns, it does not touch. Only when turning off of a road to another with a significant elevation change and even then, only some of the time. The "polish" is very light and at no time does the tire touch the airbag. It does not make any noise either. Don't think it would be advisable to attempt to grind any of the aluminum away as part of the steel mounting place would have to be modified also. As can be seen in the photo (forward most airbag, passenger's side), the normal clearance is about 2 inches. I just don't pay any attention to it as I don't think it is a problem.Pierce Quote Selected
Re: Tires Reply #237 – May 21, 2017, 02:58:11 pm Are those weather cracks on the tire or just shadows? Quote Selected
Re: Tires Reply #238 – May 21, 2017, 06:20:14 pm Ya, the date code on that "bad boy" would be interesting. Quote Selected 1 Likes
Re: Tires Reply #239 – May 22, 2017, 10:37:31 am Those are NOT cracks, merely a "patina."Pierce Quote Selected 3 Likes
Re: Tires Reply #240 – May 27, 2017, 01:16:28 pm Pierce, what I was wondering about, it seems a crack running the circumference direction of the tire, just inside from the tread. I sure not saying it not a blemish, just what I saw in the photo and asking myself, if I had that would I know it safe?I appreciate the photo. I really like Michelin and I liked the idea of a 295 tire but think unless I could get a 295/70 it would rub? Just do not like the idea of that but seems logical it only happens when turn sharp. Wish I could get Herman Power to try one, take it off if rubs much. My 275/80 Michelins are 1.75" from tire to base plate at ride heightAlways appreciate your contributions to these technical discussionsmike Quote Selected
Re: Tires Reply #241 – May 27, 2017, 02:34:56 pm Any new updates on the single rear tires. Quote Selected
Re: Tires Reply #242 – May 27, 2017, 04:24:58 pm Quote from: Michael & Jackie – May 27, 2017, 01:16:28 pmPierce, what I was wondering about, it seems a crack running the circumference direction of the tire, just inside from the tread. I sure not saying it not a blemish, just what I saw in the photo and asking myself, if I had that would I know it safe?I appreciate the photo. I really like Michelin and I liked the idea of a 295 tire but think unless I could get a 295/70 it would rub? Just do not like the idea of that but seems logical it only happens when turn sharp. Wish I could get Herman Power to try one, take it off if rubs much. My 275/80 Michelins are 1.75" from tire to base plate at ride heightmikeMike, The 275/80 Michelin and our 295/75 tires are the same diameter (within one revolution per mile at the most) and have about the same 1.75 inch clearance to the base plate. The 295/75s have almost 3/8" more width on each side at the tread. They probably would not rub at all but we spend a lot of time on unimproved roads crossing streams, making fairly steep turns off the main road into forest service campgrounds, etc. The coach is leaning over fairly far at this time. This is the only time it touches at all. In normal driving, it clears fine. The Michelin 275/80 might also touch in the same conditions. The touching is minimal and can't be seen on the tire, just a little polishing on the plate.We do have some weathering on a couple of tires. It is very slight and using Bridgestone's examples of sidewall checking, cracking, damage, etc, it's almost in new condition. We will replace the front tires in a couple more years but not worried about it now. Pierce Quote Selected 2 Likes
Re: Tires Reply #243 – May 27, 2017, 06:33:04 pm John and Stacey, that beautiful coach deserves the very best shoes. Hope that is what you have on him!Pierce, by the charts I could reduce the psi about 10 if I went from a 275/80 to a 295/80.By the charts I am to carry 110 psi in the Michelins 275. A Michelin 295/80 would be about 98 psi. I thought I might improve the ride with a bit lower pressure......in fact, some techs with direct FOT experience say they would have sold/shipped it with 97 psi (odd, for not what Michelin chart says to use.....I cannot explain that versus the weight chart)I do no see a Michelin chart for a 295/75 or 70 tire.There are several options for the 275/80. Both are maximum sidewall at 7160 lbs at 120 psi, but there is a little difference of less weight capacity at a given psi in X-Line, Energy Z, XPE2+, XZE tires versus the X Multi Energy tire.The Michelin web site says I need or they recommend the XZE 2 tire, it has 6% wider tread than before (tire)I did find this chart at tacomaworld.com. As I recall though, this varies by brand to brand, i.e. not all 275/80/22.5 are exactly the same? 295/75-22.5 275/80-22.5 DifferenceDiameter inches (mm) 39.92 (1014) 39.82 (1011.5) -0.1 (-2.5) -0.2%Width inches (mm) 11.61 (295) 10.83 (275) -0.79 (-20) -6.8%Circum. inches (mm) 125.42 (3185.57) 125.11 (3177.72) -0.31 (-7.85) -0.2%Sidewall Height inches 8.71 (221.25 mm) 8.66 (220) -0.05 (-1.25) -0.6%Revolutions per mile (km) 505.2 (313.91) 506.45 (314.69) 1.25 (0.78) 0.2% Quote Selected
Re: Tires Reply #244 – May 29, 2017, 11:35:04 am Quote from: Michael & Jackie – May 27, 2017, 06:33:04 pmPierce, by the charts I could reduce the psi about 10 if I went from a 275/80 to a 295/80.By the charts I am to carry 110 psi in the Michelins 275. A Michelin 295/80 would be about 98 psi. I thought I might improve the ride with a bit lower pressure......in fact, some techs with direct FOT experience say they would have sold/shipped it with 97 psi (odd, for not what Michelin chart says to use.....I cannot explain that versus the weight chart)I do no see a Michelin chart for a 295/75 or 70 tire.There are several options for the 275/80. Both are maximum sidewall at 7160 lbs at 120 psi, but there is a little difference of less weight capacity at a given psi in X-Line, Energy Z, XPE2+, XZE tires versus the X Multi Energy tire.The Michelin web site says I need or they recommend the XZE 2 tire, it has 6% wider tread than before (tire)I did find this chart at tacomaworld.com. As I recall though, this varies by brand to brand, i.e. not all 275/80/22.5 are exactly the same? 295/75-22.5 275/80-22.5 DifferenceDiameter inches (mm) 39.92 (1014) 39.82 (1011.5) -0.1 (-2.5) -0.2%Width inches (mm) 11.61 (295) 10.83 (275) -0.79 (-20) -6.8%Circum. inches (mm) 125.42 (3185.57) 125.11 (3177.72) -0.31 (-7.85) -0.2%Sidewall Height inches 8.71 (221.25 mm) 8.66 (220) -0.05 (-1.25) -0.6%Revolutions per mile (km) 505.2 (313.91) 506.45 (314.69) 1.25 (0.78) 0.2%Michael,Sorry for the delay in responding.This post covers several topics, all related to each other.Aspect ratio: This is the relationship of the width of the tire to the height (not diameter) here is a quote I modified to suit our sizes:"The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size 295/75-22.5 tire, the 75 means that the height is equal to 75% of the tire's width. The bigger the aspect ratio number, the taller the tire's sidewall will be."So, while a 275/80-22.5 Michelin and a 295/75-22.5 SOB may have a different aspect ratio, the diameter is almost exactly the same. The 6% wider Michelin you mention would just about make up any width difference between the two different sizes and aspect ratios. Translation; if the airbag plate rubbing were related to the width, the wider Michelin would also rub. On our coach, it's possible the regular Michelin might also rub in our "off road" excursions because of leaning, etc. As Brett had earlier posted, the (for simplicity) limits of steering travel is adjustable in case that might be the cause of the tire rubbing on the airbag plate. The installed position of the front "I" beam suspension may not be the same on all coaches. If not exactly correct (too far forward), it could cause the tire to touch in certain positions. As the aspect ratio number drops (along with the tire height), the tire has less distance (height) to flex so lower profile tires tend to have a harsher ride. Cars we see with super low aspect ratios on the street today have suspension changes (progressive shock absorbers) to soften what would be normally a harsh ride. Lower aspect ratio tires do handle better as they flex less and have a larger "footprint" on the road. The handling quality is also dependent on the tire quality and design.Tire sidewall design will also effect the ride with more flexible sidewalls giving a softer ride. Michelins are noted for a very flexible sidewall. Others like our Coopers, have a more rigid sidewall and may have a firmer ride. Both have their pros and cons.There will always be disagreement between recommended tire pressures. You will just have to figure out what make you feel good after considering the charts, placards, tire load rating, etc. An uncomfortable ride can also be caused by a damaged shock absorber. Tires may also be blamed when the problem is incorrect front end alignment. Different brand tires may be effected more or less by incorrect front end alignment.Pierce Quote Selected 2 Likes
Re: Tires Reply #245 – May 29, 2017, 11:11:29 pm Pierce As you suggested I Tried 110psi on the new toyos , happy with a firm more connected ride , as you also mention the ride became a little more compliant when carrying full tank of propane , diesel and fresh water . Overall I am happy with the new tires and would recommend them . Quote Selected 1 Likes
Re: Tires Reply #246 – May 30, 2017, 09:41:23 pm Pierce, I met with Frank at Herman Power. They offer many brands and sizes. For example Uniroyal now makes a truck tire, about half the price of a Michelin. They have Toyo and others.He recommended the XZLA tire in 275/80/22.5 H. I was thinking about the XZE 2 until I talked to Don Hay. The XZE 2 has about 6% wider tread than the XZA 3+ I have. The XZLA is said 5% more energy efficient than the XZA3+ it replaces and the tread looks much the same. Michelin web site lists differences between the tires, load ratings seem identical. My XZA3+ rubs on very tight turns. I can feel it but do not see it doing any damage. But a wider XZE 2 or a 295 I guess would rub a bit more. Wish I could just try a 295, still like that idea.I asked Power if I could turn the outer dual valve stem outward. He agreed.Don Hay got two XZLAs for the front, has Toyo already on the rear. Don said the dealer used a kevlar valve stem extension on an inner dual stem that was leaking, replacing a steel one. New idea to me.Thanks all..... Quote Selected
Re: Tires Reply #247 – May 30, 2017, 10:34:43 pm Michael,The wider tire might or might not rub more. You should try and find out what part of the tire rubs. If it's the middle portion, the wider tire won't make any difference. Ours only rubs in unusual attitudes so it might be good to find out what is unique about your coach rubbing on very tight turns.Pierce Quote Selected 1 Likes
Re: Tires Reply #248 – May 31, 2017, 07:37:04 pm Has anyone had any experience with Koryo, Double Coin, Road Warrior or Samson Tires? All of a sudden I see a bunch of ads for these tires. Quote Selected
Topic: Tires