Kuhmo Changeout Saga
Posted 12 July 2007 - 03:33 AM
Posted 12 July 2007 - 06:53 AM
They are referring to BIG truck tires that use a separate rim that bolts on, and which retains the tire. A special cage is required to air these tires after mounting, since if the rim gives way, the energy can kill. We are talking tractor-trailer sized truck/commercial tires here, not little 14" car-sized truck tires on one-piece rims.
Long made short,Tire Rack beat the best local pricing by about $50. I ordered at 12:30 on Monday and they were plopped all wrapped and strapped in front of the barn at 1:45 Tuesday.
Good folks and good prices at Tire Rack!
On the news Tuesday evening,sadly a man was crushed to death while changing a rear tire on a bus. When I began to pull the Marathons off Eggster,the NAVIGATOR due to the news report brought out the red flags. I was asked things like : Can that skinny little jack safely lift the trailer?
Sure, based on the weight rating of the jack, but even jacks CAN fail, which is why jack stands are a good idea.
How far under the trailer must you go?
You don't go under the trailer AT ALL to change a tire. If you do (for whatever reason) you use jack stands.
How old is that jack?
WHo cares as long as it is good condition. A steel jack stored in a rust-free environment doesn't age. If it were made from cheese (or Scotch whiskey), it would age, of course. Hydraulic jacks DO age, of course, with seals liable to failure with age.
What else can you put under there to help?
Said Jack Stand, of course!
Why do you need new tires anyhow,the ones it came with still look brand new.
Like cheese and Scotch age, so does rubber, but unlike them, they don't improve with age.
Unless the NAVIGATOR is happy I can't be happy. Sooo, after a good 4 ton jack and a 6000# rated jackstand under each side,and a proven safety factor of almost 5:1 the green flag was waved. The tires were changed at the local tire/alignment shop. Metal valve stems were installed.He claimed that tires carrying more than 50# should have metal. He said he believed that the chinese wheels were good for the pressure.I asked about running at a pressure lower than 65#. Answer~ D rated tires run at 65#.
Your tire man is poorly informed (as a tire expert), though he has a good point about the valve stems, though many vehicles with Load Range E tires (80psi max) come with all-rubber valve stems.
Load Range D (or "C" or "E") run the the pressure appropriate for the WEIGHT CARRIED or the posted sidewall pressure, whichever is lower. There is no reason to run full pressure at max pressure when carrying less than maximum rated weight, and several reasons why NOT to run full pressure below the maxium weight. If you consult any truck manual, or with a tire engineer (as I did when I spoke with one of Kumho's tire application engineers), you will see that commercial tires (especially) recommend pressures that match the weight on that axle so that the tire will present a full contact patch to the road.
Well,thats my story and I am happy ,the Navigator is happy it is over and the Eggster is gliding in a safer pattern because of it. Regards, Mickey
Glad to hear that things went well, and there is a happy ending to the story.
I do urge you to contact Kumho and work your way to their engineering department. I no longer have the name of the engineer I spoke with, but your Casita might get a better ride, and your tires may achieve more even wear, at a slightly lower pressure (close to 50-55psi according to the engineer). There is no "danger" running 65psi, but beside a slightly stiffer ride, your tires will wear prematurely in the center of the tread.
Edited by Bobinyelm, 12 July 2007 - 06:59 AM.
Posted 12 July 2007 - 08:57 AM
I love it. Tires so strange even their own dealers are prevented from intsalling them!
2000 Casita 17SD
Posted 12 July 2007 - 09:02 AM
After pulling from KY to San Antonio, TX. and back, .... then to Indianapolis and back, ..... the tires show NO wear. The little mold nipples are still visable on the surface of the tread, ... all the way around, on both tires.
I love these tires.
Amateur Radio K3LSC
GMRS Radio WQBL405
KY. , U.S.A.
"The American Indians found out what happens when you don't control immigration"
Posted 12 July 2007 - 11:44 AM
1999 17" FD "Towster"
In the midst of living happily ever after.
Posted 12 July 2007 - 11:59 AM
Posted 12 July 2007 - 02:09 PM
Yep, ST tires have their own set of rules, especially that when not towing, it says raise them
off the ground and reduce the pressure in them.
Much shorter life span both in mileage and calendar time, too (if one follows the guidelines).
Edited by Bobinyelm, 12 July 2007 - 02:11 PM.
Posted 12 July 2007 - 03:59 PM
Lift the darn tires off the ground and lower the pressure? Just got my new Kumho spare mounted today...worry about lifting the Casita up and lowering the pressure...too much else to worry about in this world...guess I better order some more and tote them around on the roof of the Casita...will kinda look like home :-).
Rand in the boonies:-)
17' LD "Clarissa II"
'11 Red Silverado Z71 4x4
May the wind be with you in your travels.
Posted 12 July 2007 - 04:07 PM
It's NOT an ST tire.
Posted 13 July 2007 - 02:50 PM
Posted 13 July 2007 - 03:09 PM
You might do a search and decide for yourself what you wish to do if your wheels are so-marked. Not all are so-marked.
Kumho also says it is completely unnecessary to inflate them to 65psi for use on Casita (also posted several times), but if you really want to do this despite their guidance, a thorough search may help you make a decision you are happy with.
Posted 13 July 2007 - 06:05 PM
New Wheels due wednesday
Life is Good!
1994 SD 16'
Posted 14 November 2010 - 04:15 PM
It must be time to get new tires.
RV: 1999 SD "The Little Egg"
TV: 2007 Escalade 2WD 6.2L V8 - 6L80E Trans - 3.42 Diff
Brake Control: Dexter Predator DX-2
Posted 15 November 2010 - 06:05 AM
2006 Black Chevy Suburban
2005 17' Casita Spirit Deluxe