Skip to main content ↑ ↓
Topic: Tires (Read 11355 times) previous topic - next topic

Re: Tires

Reply #140 –
After checking my notes, I'm 10,500 on the front (not 9500) and 17,100 on the duals full fuel, water and most "stuff".  I figure no more than an additional 300 LBS of booze, ice, food and clothes (in order of importance 😉) so next trip out I'll try 100 in the steer and 85 on the back.  Should have plenty of safety margin.  My coach has a case of the wanders also, so maybe an air pressure adjustment instead of 2-3 CB's and 3 days in the pit will fix it.  Had the same wander with the Mich's.  Can't blame the new tires.

Re: Tires

Reply #141 –
Quote from: Barry & Cindy –
We carry 100 all around and most of the time with temp and elevation changes, the tires are often closer to 95 when cold.

I run 100 all the way around too. It's not too much PSI as the tires still flex some, visually.  I have the crossfire equalizers on the rears at 100PSI. I don't think 10-15psi would give me that much smoother ride.

Re: Tires

Reply #142 –
Jet Doc five psi is noticeable on tire pressures.

100 for your front axle weight seems high. Probably mid 80's

Especially if you are mentioning a wander issue

Re: Tires

Reply #143 –
Quote from: Jet Doc –
After checking my notes, I'm 10,500 on the front (not 9500) and 17,100 on the duals full fuel, water and most "stuff".  I figure no more than an additional 300 LBS of booze, ice, food and clothes (in order of importance 😉) so next trip out I'll try 100 in the steer and 85 on the back.  Should have plenty of safety margin.  My coach has a case of the wanders also, so maybe an air pressure adjustment instead of 2-3 CB's and 3 days in the pit will fix it.  Had the same wander with the Mich's.  Can't blame the new tires.
You probably have inadequate toe in. The biggest reason for not tracking straight, especially on uneven roads.

Pierce

Re: Tires

Reply #144 –
I just had 2 new steers (Toyo) put on. I really like the way they feel when driving on narrow roads. With that said, it will take some time to see how they compare to the Michelins I had on. The tire tech told me that new tires should not be balanced internally or externally! News to me, however, he said that if the tire feels a little out of balance, the right way to get it right is to relocate tire on the rim. I brought the coach up to 80 to see and to my amazement, no shake, wobble. I learn something new everyday.

800.00 for 2 tires with mounting.

Re: Tires

Reply #145 –
That's a new one,thought about it for a while,if you try and balance by relocating the tire on the rim you would have to balance
the rim and the tire seperately.If you go by his reasoning and you "feel" a wobble then that means the tire itself is out of balance.
Just sounds very strange to me.Which Toyos did you get?

Re: Tires

Reply #146 –
Quote from: cubesphere –
I just had 2 new steers (Toyo) put on. I brought the coach up to 80 to see and to my amazement, no shake, wobble. I learn something new everyday.
80 what? PSI or MPH? If 80 psi, what did you start with? Seems very low to me. We have always run 110 psi in the 295s.

Pierce

Re: Tires

Reply #147 –
John,
    The Toyo's I put on mine were Toyo M177's, 295 75 22.5 H rated.  Paid $400.00/tire in Sealy TX.  Have not been on a real trip yet.  Going to Kerrville Sunday for a week. Will give an update when we return.

John

Re: Tires

Reply #148 –
Quote from: cubesphere –
The tire tech told me that new tires should not be balanced internally or externally! News to me, however, he said that if the tire feels a little out of balance, the right way to get it right is to relocate tire on the rim. I brought the coach up to 80 to see and to my amazement, no shake, wobble. I learn something new everyday.

Unless you're hauling the DWs rock collection, 82 psi is where we sit after being weighed. I do have files that show the PO bought these Michelins from some FMCA deal. The outlet, (not Bubba's tire store) charged them almost $700.00 after the "good deal".
I would have done the same thing; I made no mark-up/profit on the tires, so the force balance,/dismount/remount were charged for.
Yes, extras were new aluminum valve stems, and fresh wheel studs all around, but the outlet charged accordingly!  ^.^d

Re: Tires

Reply #149 –
Sorry guy's,

80mph is what I should have said with 115psi. The tires are m170Z, 295/75 22.5.

Re: Tires

Reply #150 –
You know our tires are speed-limited to 75mph, right?  I'd hate to think you were damaging your tires right off the bat.

Re: Tires

Reply #151 –
Tires have a huge safety factor built in and 75 mph rating also covers tire company liability. Big rigs abuse the 75 mph rating all the time but the drivers are professional and are much better able to handle an emergency. Naturally, a blowout at 80 is a lot different than 55. Good video of what can happen to a RV in less than two seconds on YouTube: https://www.youtube.com/watch?v=9LkLeljt4t0

While the tire may not be damaged going 80, a road gator may give you a bite anytime. The guy above was going a lot faster than 55 and pretty typical of what would happen to the majority of RVs at that speed with a blowout.

Pierce

Re: Tires

Reply #152 –
The speed limit here is 70mph and I only took the coach to 80 briefly to check for how well balanced the tires feel. I have been a professional racer most of my life, and have over 2 million safe driving miles with Trucks hauling heavy equipment, cranes etc. I know what my limitations are barring a mechanical failure. Pierce is right, big safety margins are built into these tires as well as most equipment. Crawler cranes are rated at 75 percent with a 25 percent margin tipping and structural. I do not advocate exceeding ones own skill set!

Re: Tires

Reply #153 –
Yikes!  Sobering video.  Looking at it I wonder if having the toad was a positive or negative factor.  It seemed like it was initially working to keep the wheels in line right up to the point when the front end tucked under. 

Re: Tires

Reply #154 –
" Looking at it I wonder if having the toad was a positive or negative factor. "

That is entirely dependent on how the braking system functions on the toad relative to the coach. The toad could be used as an anchor to help keep coach in a straight line, however, in most cases the weight of the toad just adds to a loss of complete equilibrium, not good. Most of the time in racing, there is an old saying, when in doubt gas it for good reason although, counter intuitive to most.

Re: Tires

Reply #155 –
Count the tenths of a second in the slow motion of the tire failure. One second later, it's way too late to keep it on the highway. He had to turn the wheel hard to the right in several hundreds of a second and at 80 mph, he was light years too slow.

I had the exact same blowout years ago southbound on I-5 in California's Central Valley. The tires were only a month old. It made a funny noise each rotation for about a half second and then a huge bang right below me. I was in the fast lane at about 65 mph and it instantly headed toward the center divider. It really only moved a couple of feet before I had a lot of correction in the wheel. Just lots of tire noise after that. I got it stopped pretty quickly on the shoulder but the tire was in small pieces after that.

In case anyone is wondering, there is no time to even contemplate using the brakes. It's steering input that happens way before anything else. The nice truck blowout video on the straight and level highway is wishful thinking. Blowouts can happen on off ramps, turns, mountain roads with downhill turns. Each case is unique. One Foreforum member bought a coach that had a blowout on a curve and went down the side of a hill. After getting pulled out, he put a back tire on the front and drove across Mexico with only one tire on one side in the back. Tires DO have a pretty good safety margin to have survived this. Why would you do this???

Pierce

Re: Tires

Reply #156 –
I had the front right blow out on the '81 on HWY. 14 in Mojave. It was not so much counter steer as hold my line when it popped. Until getting slowed down, I didn't use the brakes. I was towing my Grand Cherokee with the brake buddy.

Re: Tires

Reply #157 –
Quote from: craneman –
I had the front right blow out

We had the same thing happen. It was so noisy, I thought something had let go in the whole front end! Same deal, no brakes, just found a (sorta o.k.) place to pull over. I was sticking out in the lane a little, called for assistance and put the markers out. Cop pulled behind, looked at the trashed tire, and said, "you are one lucky driver."  ^.^d

Re: Tires

Reply #158 –
Quote from: John  and Stacey –
John,
    The Toyo's I put on mine were Toyo M177's, 295 75 22.5 H rated.  Paid $400.00/tire in Sealy TX.  Have not been on a real trip yet.  Going to Kerrville Sunday for a week. Will give an update when we return.

John


Hi John,
just got new TOYO's all round (Same size) as well. From Lampasas Tire to the house they road nice. May make a trip to Port A in May so will have a better idea about their performance. Interested to hear how your Kerrville trip goes.
Safe travels,
Chuck

Re: Tires

Reply #159 –
Replaced the 7 year old Michelins today, With toyos , initial impression is that they are quieter and definitely less "float " on steering , I can only assume this is due to stiffer sidewall .
Thanks to everyone for their input