Just want to know about Toyo M170 & M177

Topic: Just want to know about Toyo M170 & M177 (Read 8923 times) previous topic - next topic

Re: Just want to know about Toyo M170 & M177

Reply #25 – November 02, 2017, 10:53:19 pm

Scott,
The Toyo's on our coach were on it when we bought it in April 2012 and 44k mls later the rears still have good tread left on them. The fronts were changed out 26k mls ago after a lazer alignment, I run them front and back at 95 lbs and when it's time for a change I'll put on some 275x80R's (Toyo's) rather than the 9R's.

Re: Just want to know about Toyo M170 & M177

Reply #26 – November 03, 2017, 09:18:33 am

Quote from: Olde English – November 02, 2017, 10:53:19 pm

Scott,
I'll put on some 275x80R's (Toyo's) rather than the 9R's.

That is a BIG step up.

9R= 543 revolutions per mile
275/80R22.5= 515 revolutions per mile

And, if you have 6.75" wheels, the 275's will not fit.

Re: Just want to know about Toyo M170 & M177

Reply #27 – November 03, 2017, 10:09:42 am

This is timely discussion for me. I need to put tires on the 1999 U320 I am picking up Thanksgiving week at MOT. Dealer says he is having trouble getting Michelins in the size I need. He has Uniroyals in stock and can have the Toyo's in a day. The Toyo's are $2938 for 6 with just the front 2 balanced. Add $100 to balance all 6. Uniroyals were about $500 less.

I will have two pretty good Michelin 275-80-22.5 XZA 3' that will come off the front and 4 really old ones (2005) from the rear.

I may just keep the steer tires and replace the back 4 depending on how good the front two are. Because I can't get the same tire I don't want to mix up sizes and brands on the back.

Re: Just want to know about Toyo M170 & M177

Reply #28 – November 03, 2017, 10:25:09 am

Quote from: mattschilds – November 03, 2017, 10:09:42 am

This is timely discussion for me. I need to put tires on the 1999 U320 I am picking up Thanksgiving week at MOT. Dealer says he is having trouble getting Michelins in the size I need. He has Uniroyals in stock and can have the Toyo's in a day. The Toyo's are $2938 for 6 with just the front 2 balanced. Add $100 to balance all 6. Uniroyals were about $500 less.

I will have two pretty good Michelin 275-80-22.5 XZA 3' that will come off the front and 4 really old ones (2005) from the rear.

I may just keep the steer tires and replace the back 4 depending on how good the front two are. Because I can't get the same tire I don't want to mix up sizes and brands on the back.

Had the same situation a couple of months ago, The 6 rear uniroyal rs20 h rated were about $300 each in Nac. The tires seem fine to me.

Re: Just want to know about Toyo M170 & M177

Reply #29 – November 03, 2017, 10:33:56 am

Quote from: Caflashbob – August 18, 2017, 11:58:11 pm

The xza-3+ with there 19/32nds of tread depth does have a "squirm" if you are sensitive for this kind of stuff.

If I could find a tire place that could cut and true the tires down to 16/32nd's I would gladly pay them.

Need a commercial tire trueing dealer. Any leads?.

Truck Tire Truing & Balancing | Garden Spot Frame and Alignment

A google search brings up a number of places that do this. I'll bet it makes a major difference. Not to mention fuel savings, new tires use significantly more fuel, iirc, 7% compared to mid wear tires.

Re: Just want to know about Toyo M170 & M177

Reply #30 – November 03, 2017, 10:47:52 am

Quote from: mattschilds – November 03, 2017, 10:09:42 am

This is timely discussion for me. I need to put tires on the 1999 U320 I am picking up Thanksgiving week at MOT. Dealer says he is having trouble getting Michelins in the size I need.

I would call Michelin direct and ask them about supply.

Michelin Tire Questions?
Call: 1-866-866-6605

Open 8am - 8pm EST, M - Sat.
8:30am - 4:30pm Sun. for chat only.

Re: Just want to know about Toyo M170 & M177

Reply #31 – November 03, 2017, 12:35:32 pm

I was under the impression that the 275x80R was a fit on my 7.5" wheels, if not what would you suggest

Re: Just want to know about Toyo M170 & M177

Reply #32 – November 03, 2017, 12:42:22 pm

I just mounted 295/75/ on my 7.5 . Rides well
275 should be fine.

Re: Just want to know about Toyo M170 & M177

Reply #33 – November 03, 2017, 12:46:34 pm

Thanks Mike,
I thought that was the way to go, just needed a little positive reinforcement...lol
Mick

Re: Just want to know about Toyo M170 & M177

Reply #34 – November 03, 2017, 12:57:52 pm

Quote from: Olde English – November 03, 2017, 12:36:21 pm

I was under the impression that the 275x80R was a fit on my 7.5" wheels, if not what would you suggest ?

They will fit on the 7.5" wheels.

But, my caution was for the 6.75" wheels which were very common on 9R tires.

Re: Just want to know about Toyo M170 & M177

Reply #35 – November 03, 2017, 01:19:03 pm

Measure your wheel wells and compare to the wheel well size thread. Aalso verify that the body is square on the chassis . I have only 1 in clearance de aired and about 1.6 with air.
My tires are 39.4 or so.
According to others, there are at least two sizes of wheel wells. 41.5 and 43 ish. Mine is 41.5 and a tight fit. but no rubs.

Re: Just want to know about Toyo M170 & M177

Reply #36 – November 03, 2017, 02:02:17 pm

If you have enough clearance for 295/75's, that's what I would recommend. Most any truck tire shop would have that common size in stock in case one was needed while on the road and could be run at lower pressure with more capacity.
Otherwise, 265/75's are roughly the same diameter and about 1" wider.

Re: Just want to know about Toyo M170 & M177

Reply #37 – November 03, 2017, 09:27:25 pm

Bob,

I have Michelin XZEs that came with my coach when I bought it. The previous owner put about 3,000 miles on them and I did the rest. They appear to be 100,000 mile tires based on my observed treadwear, which agrees with what I was told by truck drivers with these same tires. Strangely, the rear tires seem to be wearing slightly faster than the fronts, although the fronts have a little cupping along the outside edge from fighting strong crosswinds across the southwestern states. When I drive back east where there aren't strong crosswinds the cupping corrects itself. My coach's data plate says to set tire pressure at 90 psi on all six tires. I normally run them between 90-100 psi. The tires are rated for 110 psi. They are size 275/80R 22.5

Re: Just want to know about Toyo M170 & M177

Reply #38 – November 06, 2017, 09:41:27 pm

Quote from: RRadio – November 02, 2017, 11:54:21 am

Brett, is it an actual fact that nobody has ever worn out a set of tires on an RV? My tires are about half worn at 50,000 miles with only tiny checking starting on the sidewalls. I have a brand new spare tire to compare tread depths with, which is how I came to the half worn figure. I do often see newer RVs than mine with much worse weather cracking on their tires and very little treadwear... Surely someone on this forum has worn out a set of tires on an RV, or am I gonna be the first one ever? ...I predict I have less than five years of tread life remaining at my current rate of travel. It's taken about five years for the tiny checking to develop in the sidewalls so I doubt they'll have bad weather cracking before they wear out. At my current rate I will lose about ten brand new trailer tires to belt / tread separations before I finally wear out my coach tires.

It is not just the sidewall checking, the rubber dries out. It then separates, the flapping will heat up the tire, raising the pressure, and then, boom, if not just throwing off the tread. I've had a blowout, never want to again or hear of someone else. The day before the blowout I went to install 6 new tires on the rv I just bought, they were out of stock, driving approx. 100 miles to get the tires installed. The day before, checked tire pressure, jacked up the rv and had the tire store check the tread, 3/4 left, no tire checking, no splits in tread. The next day, boom. You are not wasting $$ to replace at 6-7 years. You might be wasting your life if you do not. Michelin in the past recommend dismounting and inspecting at 5 years. I've know several people that sell their tires at 3 years and buy new ones. I believe that is overkill. All 3 had experienced a blowout. If I had the $$ I'd do the same.

Re: Just want to know about Toyo M170 & M177

Reply #39 – November 06, 2017, 11:32:15 pm

I've never heard of a commercial truck driver replacing a tire for any of these reasons. They all tell me to run them until they're worn out. Diesel mechanics tell me that too. The tire salesmen won't answer me when I ask them if my tires are okay... but an indie trucker standing there told me he'd take my tires if I didn't want them anymore...

Re: Just want to know about Toyo M170 & M177

Reply #40 – November 07, 2017, 12:21:34 am

Scott

Would you advise owners to keep their fiberglass engine fan blades (like the one that exploded on your unit) since they have been fine for 20 + years on the unit, they must be good indefinitely because they look good visually?

Just because an event hasn't occurred to you does not make the event any less real or likely, or create a new "best practice" The fact that your tires have't failed is interesting, but in a sample size of one does not prove that good tire management practices replace tires due to age.

I look forward to your posts, including posts regarding your tires, but having had a blow out and the $$ and inconvenience (not to mention possible safety impacts) 6-7 years on a set of tires is plenty for me, no matter how much tread is left on them.

I am not tying to pick an argument, just trying to reframe the conversation.

Tim Fiedler

Sure Start Soft Start

TCER Direct generator-gas-prod 630 240-9139
Gen-Pro

Re: Just want to know about Toyo M170 & M177

Reply #41 – November 07, 2017, 08:13:02 am

X2 on what Tim said. Trucks ware tires out from miles. Rvs rot them out from lack of use.

Re: Just want to know about Toyo M170 & M177

Reply #42 – November 07, 2017, 10:00:27 am

Replacing tires based solely on the age is, in my opinion, similar to buying "insurance". You are paying a "premium" (the cost of the new tires) to replace what look like perfectly good tires, in the hope that doing so will decrease your chances of having a catastrophic blowout at some future date. Is this a good use of your hard-earned cash? Depends...

If you don't replace the tires, and 100 miles down the road you have a blowout, you will wish you had spent the money.

If you don't replace the tires, and drive another 10 years without a blowout, then you will be glad you didn't waste the money.

If you do replace the tires, and 100 miles down the road you have a blowout, you will think it was a waste of money.

If you do replace the tires, and drive another 10 years without a blowout, then you will believe the money was well spent.

One scenario is no more or less likely than the other. Too many variables to calculate a predictable outcome.

In the end, it's all just a roll of the dice...

So...Do What Makes You Happy.

Re: Just want to know about Toyo M170 & M177

Reply #43 – November 07, 2017, 10:46:14 am

Nothing wrong with extending tire life, IF you inspect your tires often. Sidewall and tread area for weather and road damage, and of course inflation. Also if you are one of the folks that like roll on like thunder on the interstate, as opposed to running along 60-65 you might want to keep good front tires no older than 6 or do years old. Try taking your cell phone and take a picture of your old tire sidewall you will be suprised what you may see. DWMYFG

Re: Just want to know about Toyo M170 & M177

Reply #44 – November 07, 2017, 11:03:28 am

Being a RV tech, plus having been a RV service advisory, that coupled with my own RV experience (and race car trailer tires included) I would never forgive myself, if I had another tire come apart on the road. What I tell people is, it's not the blow out, or tire coming apart, it's the damage it does to the vehical.
When we bought our coach last year. It had perfect big dollar Michelin's all around. Fronts were 10 yrs rears were 8 yrs. No cracking. Never gave it a second thought buying new tires all around.
Tires don't normally wear out 1st, they date out. it's the glue
Cheap insurance
Cheers

Re: Just want to know about Toyo M170 & M177

Reply #45 – November 07, 2017, 11:12:05 am

Even if you don't care about yourself or your own coach, think of the guy you run off the road when you lose control, or the guy behind you who gets that "gator" in the windshield, or the motorcyclist that doesn't see it, and hits it, and dumps his bike. THIS, I can testify to.

Re: Just want to know about Toyo M170 & M177

Reply #46 – November 07, 2017, 07:25:47 pm

Sorry to be so uncaring. I don't know how often to buy new trailer tires to keep them from killing someone. Can you please help me calculate this? Every time I drive across the country and back I lose at least one brand new trailer tire. How new do these tires have to be for safety? I lost the first brand new tire with about 3,000 miles on it. I drove from Maine to Arizona and it came apart. It was a few weeks old. I've lost a half dozen brand new tires since 2014... Maybe if I buy new tires every day or every 1000 miles we'll all be safe?

Re: Just want to know about Toyo M170 & M177

Reply #47 – November 07, 2017, 07:39:29 pm

Scott,

If you are loosing that many trailer tires, one of two things is at work:

Poor quality tires.
And/or
They are overloaded.

My brother was having the blowout problem on his boat trailer tires (cross country with triple axle trailer with 32' motorsailer). New, quality 15" tires-- blew 2-3 per trip. I finally talked him into spending a couple of thousand dollars on 6 new 16" wheels and higher load range tires. He just round tripped from Texas to British Columbia with zero tire issues.

Re: Just want to know about Toyo M170 & M177

Reply #48 – November 07, 2017, 07:58:48 pm

It's my understanding that some or all commercial trucks tires have anti ozone and cracking sidewall agents built into them during manufacture.

The agents are apparently released by the tires flexing during use.

Which obviously we do not do as much of

As none of these truck type tires were specifically made for rv's it would seem we have little way to judge a particular brand/model actual resistance to these issues.

My personal thoughts were to look at what Foretravel used OEM.

Second did any brands offer a mileage or age warranty of any kind?

Thirdly are there any design criteria that might add to my safety or easier driving?

Lastly what brands might be generally asked for by other owners enough for the rv industries parent organizations to arrange commercial account discounts.

Dry air or dry nitrogen use would seem required

Re: Just want to know about Toyo M170 & M177

Reply #49 – November 07, 2017, 08:47:05 pm

Quote from: RRadio – November 07, 2017, 07:25:47 pm

Sorry to be so uncaring. I don't know how often to buy new trailer tires to keep them from killing someone. Can you please help me calculate this? Every time I drive across the country and back I lose at least one brand new trailer tire.

Hopefully they're not 15" Goodyear Marathons... the Airstream forums are resplendent with stories about them... and major failures... This is the reason so many are going to 16"... But I understand the 6 to 7 year rule is a standard as MoHo tires rarely earn the 50K+mile wear on 'em. Most time sitting & a'waitin' for some action in the sun before giving up the ghost...

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