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radial tire question
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dkarnath
Posted 2016-07-25 4:47 PM (#3659)
Subject: radial tire question


Location: Medford, OR
(204.10.247.1)		So I got my new bias ply rubber mounted this last week......I had to buy the tires from one vendor, tubes from another, then flaps from another (This was really due to me wanting to save a few bucks), then down to the tire shop to get mounted and balanced. It put me under 1,500 all in. I am bummed I have to run the old technology, but it is what it is for now. So, when I was paying my bill for the mount and balance, the tire tech dude says "Why didn't you just put a set of 235/85-17's on it?".....Honestly, I wanted to punch him in the face.....All the info past and present I've read about the factory 17" FMC steel wheel, is that their is no radial tire/size option out there anymore since Michelin stopped making them??? What is everyone's (or whoever gives a damn about the 17" wheel) opinion on this size tire??? Is this something I should have them mock up and see how they fit? Has anyone tried this?? The 235/85-17 would be a 32" tall tire, maybe the gearing would really suck? idk? I'm going to do some searching too.

Dan
#850
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BigRabbitMan
Posted 2016-07-25 5:08 PM (#3660 - in reply to #3659)
Subject: Re: radial tire question



Location: Cottage Grove, OR
(75.139.213.151)		The last time I did some searching for tires for the original rims, all the 17" ones other than the Coker tires were passenger car rated tires. Would not support the weight of an FMC. Did the tire guy give you a brand and tire weight rating to go along with his comment?
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5Dollar
Posted 2016-07-25 5:54 PM (#3662 - in reply to #3660)
Subject: Re: radial tire question


Location: Bethune, SC
(165.166.72.232)		As I have written before. if you have to use the split ring rims, bias ply tires designed for tubes are the only way to go. If you put a radial tire on that Budd rim, it is probably tubeless, not designed for the extra heat of a tube. The sidewall flex is entirely different. The radial tire will eventually develop cracks at the rim due to the flex pattern. If you have done this, check your tires around both sides at the rims for 'smiles.' The weird occasional use use patterns of motor homes does not help this. Standing still is not what tires are designed for. The person who mentioned the 235/85-17 tire was ignorant of fitting tires to Budd split ring rims. Radial tires are not compatible with the Budd rims. They do have the weight capacity. Call the tire manufacturer and ask them about radials on split ring Budds if a dealer says they will work. Henry
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dkarnath
Posted 2016-07-25 5:21 PM (#3661 - in reply to #3659)
Subject: Re: radial tire question


Location: Medford, OR
(204.10.247.1)		It was a Les Schwab tire, load range E, 10 ply. I just did some searching on-line and found a tire calculator, and It looks like the 235/85 R17 is around 9.25" wide, and the bias 7.50 is 7.5" wide. You would have rub issues I'm sure on the rear? And there is about 1.5" difference in height. I think this one may get put to bed.....Im comin for that tire Stephen!! ha
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andy1canada
Posted 2016-07-25 6:56 PM (#3663 - in reply to #3659)
Subject: Re: radial tire question


Location: Victoria, BC. Canada
(50.92.248.189)		I thought we'd been down this road before? If not here, certainly on the Yahoo site. IIRC, someone who knows about tires and the temp difference between running a bias w/tube vs a radial w/tube confirmed that the temp difference was actually marginal and that it was likely safe to do so. Anyone else remember this thread from 3 or 4 yrs ago? Might have been Eddy.

For a time I also compared the various candidates diameter as compared to the ole' 17" Michelin's (XCA's ?) we ran on these things. Turns out the Michelin's at 33" dia were quite stellar in that department. The lucky ones of us have 19.5" wheels with way more choices for rubber.

Good luck.
Terry
#846
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dkarnath
Posted 2016-07-25 7:10 PM (#3664 - in reply to #3663)
Subject: Re: radial tire question


Location: Medford, OR
(75.142.8.77)		I just thought I would throw it out there... I was 99% sure their was no radial available like the XCA's. And yes, both FMC's I've had in my possession had xCA's
with a lot of sidewall cracking, I figured it was just from age. I guess we are done beating this horse.

Dan
#850
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5Dollar
Posted 2016-07-26 12:34 PM (#3673 - in reply to #3659)
Subject: Re: radial tire question


Location: Bethune, SC
(165.166.72.232)		Sidewall checking is not the problem that radials get from being mounted on split ring Budd wheels. On these radials, it is a split in the rubber that develops at the rim line that eventually goes all the way around the tire, if you do not have a blow out first. This 'smile' comes from the bead area not being designed for the shape of the bias ply rim. Google searches will find cross sections of both types of rim. The differences are very obvious.

Henry
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