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Hal DeWitt
Join Date: Jul 2003
Posts: 22 New Brunswick, Canada
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2002-11-11          44893


I have a B7500 Kubota which I trailer quite a bit on both pavement and dirt roads. My trailer is 14' by 7' rated for 4400 pounds. The tires are 5.30 by 12 Carlisle 6 ply. I have ruined 3 tires this summer in only about 500 miles. All have had the sidewalls bulge. Looks like broken cords to me. The trailer is not overloaded according to the tire ratings. I am looking for a heavier tire in the same size. The only one I can find on the net is made by Nanco. It comes in 4, 6, or 8 ply. I have never heard of Nanco. Does anyone have experience with these tires? Can anyone offer other tire manufacturer suggestions?



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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-11-12          44908


I'll stay away from brand discussions. I don't know much about tire brands anyway. A recommendation from me wouldn't be very credible anyway. I'm still running THE Firestone tire on my 1/2-ton but not from the production runs that were recalled.

Off the top of my head, I wonder if changing tractor position in the trailer might alter the tongue weight. Some balances may create larger load shocks on tires than other balances. I think my single axle 5' x 8' utility trailer tires are 15". I wonder if 12" tires would run hot and larger tires even in the same load range would work better. Others here know far more about this stuff than I do.
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DRankin
Join Date: Jan 2000
Posts: 5116 Northern Nevada
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2002-11-12          44913


That is my thought too, Tom. Those little 12 inchers must be screaming at highway speeds. And I'd bet if you added up the weight of tractor and implements plus the trailer weight you are right at max. Do you have room for larger wheels ? ....


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DavesTractor
Join Date: Jul 2003
Posts: 148 Red Bluff, California
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2002-11-12          44915


Is this a tandem or a single axle trailer?

I can't think you are getting 4400lbs capacity out of a single with 12" tires, yet we do not see many tandems with 12's on them. That makes me curious.

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slowrev
Join Date: Jul 2003
Posts: 231 Winchester , KY
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2002-11-12          44924


Does the trailer have springs or is it a frame on axle type of trailer. I have found from experience that trailers without springs if used on rough roads need to be de-rated about 50% if you want the tires to last. After all they are acting as springs and carrying the load too.

Ben in KY
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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2002-11-12          44930


I have the 12" 5.30 on my boat trailer that is rated up to 2500 lbs but in reality it has less than that. The maximum load rating I can find on a 12" 5.30 is 1045 lbs. Seem like you are overloading the tires. I would be worried about the huds and axle ratings. Some how I think someone is snowing you concerning the trailers load rating.
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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-11-13          44943


I guess I assumed the trailer has tandem axles. A 4,400 lbs. load on a single axle probably would be greater than my old '66 Econoline that had 13" tires.

On the Econoline I had two cord separations with 6-ply 45 lbs. max pressure tires. I never had a problem after I put on Goodyear 8-ply 60 lbs. tires. However, I didn't carry as heavy loads on the highway after I got the 8-ply tires. I think 13" 8-ply bias tires do run hot and may not be made any longer for that reason.
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Art White
Join Date: Jan 2000
Posts: 6898 Waterville New York
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2002-11-13          44952


Hal, is your trailer a tandem? I would assume that it is for that much weight on that size tire. I think that depending on the road that speed could be a factor for there failure. Load placement could also be a cause of the problem. ....


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Hal DeWitt
Join Date: Jul 2003
Posts: 22 New Brunswick, Canada
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2002-11-14          44996


Art: my trailer is a tandem. The tire ratings are 1045 pounds at 80 psi. I find the trailer very choppy unloaded at that tire pressure so usualy run 50-60 pounds. The trailer is very well built (these guys have been in the business for years) but the tires seem to be the weak spot. I never weighed the tractor with FEL and winch but guessed about 3000 pounds based on Kubota literature. Maybe I am way off and the load is heavier. I am not worried about hubs and spindles as they were oversized on my request. Axels are rated at 2500 lbs each. I could go to 13" wheels but want to keep the deck as low as possible not to mention I just made the investment in the trailer. ....


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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-11-15          45009


Hal: Conventional wisdom is that a tractor always weighs more than we think it does. I would check the load rating of the tires at 50-lbs. Seems like there's a good chance they'd be overloaded at that pressure. ....


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DRankin
Join Date: Jan 2000
Posts: 5116 Northern Nevada
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2002-11-15          45012


I think a taller tire is the answer:
1) It is much easier to find the weight rating you need in a larger tire.
2) Every inch you add to the height of a tire only lifts your trailer 1/2 inch but adds over 3 inches to its rolling circumference.
3) Add enough inches to the circumference and your can slow the tire way down in terms of revolutions per mile and that in turn will slow down it flexation rate, and therefore it will have less heat build up and decreased failure rate.
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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2002-11-15          45023


Personally I would stay away from the 12" wheel. I have them on my boat trailer but the Seadoo is very light and does not move on the trailer with tiedowns.
I have never seen them stand up with heavier loads or work well with tandem axels. I wish I had a dollar for every old tandem 12" boat trailer rig I had seen in my travels with blown tires.
With dynamic loads like a tractor, ie the wheel will flex as it corners etc. loads are transfered to 2 or 3 tires. If you have 2 tires carrying a load of 4 for a moment then you are asking for a blow out.
I guess I am not certain as to why you need to so low. My trailer with dove tail has a deck near 2 ft of the road. I have never had any trouble loading with 4x and ramps.
I would look at possibly the wider rims and the commercial tires used as moving dolly tires. ....


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TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
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2002-11-16          45047


Maybe somebody who knows trailering better than I can comment. I think it's pretty certain that taller tires would be better. I'm wondering about a solution where the 12" ones might get by. I believe Hal reduced the tire pressures from the max pressure ratings because there was a lot of 'chop' to the trailer. There's a good chance that the load is excessive for the reduced pressures. I'm wondering if a load distributing type receiver might reduce the chop and make operating with higher pressures more comfortable? ....


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cutter
Join Date: Feb 2000
Posts: 1307 The South Shore of Lake Ontario, New York
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2002-11-16          45050


I always order the oversized tires whenever I purchase a vehicle/trailer for obvious reasons, but you have to work with what you have there. Something doesn't seem right here and I would suggest you check the axle alignment on that new trailer to see if it is tracking true. Beyond that, proper weight placement as Tom suggested and a larger tire would definately help reduce heat and stress. ....


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David Waite
Join Date: Jun 1999
Posts: 43
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2002-11-17          45063


My 2cents. Have you weighed the trailer/tractor combo to see if it is a weight problem(if the tongue is high most weight will be on the back axle)? Look in the phone book for public scales. And is it the same position tires that are blowing(could then point to loading tractor position)? Are the axles close together or spread apart? Spread axles and tight turns can cause sidewalls to break on tires. Another option for tires would be to move up to 20.5X8.0-10 loadrange C/D same weight rating about 1050 but less sidewall flex. ....


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Art White
Join Date: Jan 2000
Posts: 6898 Waterville New York
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2002-11-18          45095


Hal, sorry I've been at home doing some remodeling. Now your tires have just over 4000 lbs capacity. your tractor weighs about 3000 from what you have said. That means that the trailer has to weigh in at less than 1000lbs for the tires to be in there capacity range. A range of 4400 lbs overloads your tires. ....


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cutter
Join Date: Feb 2000
Posts: 1307 The South Shore of Lake Ontario, New York
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2002-11-18          45120


That would be a pretty marginal overload to cause them to wear out in 500 miles would it be not Art? I still believe axle placement or alignment is the problem here, I have run overloaded on four ply rated junk tires and never had a problem with them flying apart. ....


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Hal DeWitt
Join Date: Jul 2003
Posts: 22 New Brunswick, Canada
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2002-11-18          45130


Thanks very much for all the advice guys. Axles are close together and it has always been the front tires that have failed. I will try loading closer to the rear of the trailer. I have also gone back to the manufacturer and told him I am not too happy and what does he suggest. No feedback yet. A friend suggested the springs are too stiff for the load and are not giving any. Therefore the tires have to take all the pounding and are breaking the sidewalls. When it all gets done I think 14" wheels are in the picture. ....


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Art White
Join Date: Jan 2000
Posts: 6898 Waterville New York
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2002-11-19          45138


Hal, with big trucks it is normally the rear tires that will get flats due to the front ones standing sharpe
pieces up. Now on another side. Do you load the tractor to the front? What else do you have on it? The fronts are overloaded from the description of what is going on.. ....


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DavesTractor
Join Date: Jul 2003
Posts: 148 Red Bluff, California
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2002-11-19          45161


We have a pickup with a trailer on the road delivering a tractor or picking up things almost everyday. I have had a couple of flats, but never a blowout or other outright failure. I think the key its to not be running right at the margin. Installing some 8-ply 14" tires will give you a lot of comfort and if your 4x4 tractor can't climb a couple more inches of ramp, then we have another subject to discuss! ....


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DRankin
Join Date: Jan 2000
Posts: 5116 Northern Nevada
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2002-11-19          45164


I think the combination of max or near max load and the speed at which those little 12's are turning is creating a heat problem. I bet those 14 inchers will turn about 1/2 the speed of the 12's. ....


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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2002-11-19          45168


I am alway concerned about the 12" tires on my light boat trailer. I am always checking the temperature of the tires and bearings when I stop. If the bearing over heat they will quickly loose their grease and have catastrophic failure. ....


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Farmerbob2
Join Date: Jul 2003
Posts: 11 Nazo, Pa
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2002-11-19          45192


Hal~
Make sure you don't put that tractor too far back on the trailer or you'll have A LOT more to worry about. I think those tires are too small for that trailer. I would get some 14" or 15" tires if possible to put on there. ....


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JAZAK
Join Date: Jul 2003
Posts: 31 COXSACKIE,NY
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2002-11-21          45265


LIKE THE OTHER POSTS IF HEIGHT IS THE PROBLEM MAYBE JUST MAYBE YOU COULD CHANGE THE AXLE HANG (IF IT IS OVER SLUNG)SPRING ON TOP OF AXLE TO (UNDER SLUNG) SPRING UNDER AXLE. MOST LARGE TRAILER SHOPS SELL THE BOLTS AND SPRING PERCHES. THIS COULD BUY YOU UP TO APPROX. 5 INCHES OF HEIGHT TO GO TO LARGER TIRES.(AS LONG AS YOU HAVE ENOUGH AXLE TO FRAME CLEARENCE TO PREVENT BOTTOMING.) ....


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