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Tool Talk Discussion Forum

Radial Tires, How low can you go?

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Kevin

06-14-2004 19:41:28




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I recently purchased a tow dolly and upon reading the instructions, they want me to lower the air pressure in the tires to ten pounds when hauling empty. Not only does that make it a pain when you get where you are going and have to find an air supply, I really don't want to deflate my new 6 ply tires. So, thinking that I am a genius, I mounted some radial tires/wheels I have on it, thinking that 32 lbs. on a radial tire would give a smooth ride. Wrong! If anything, it bounced more! So, my question to any tire experts out there is: How low should I go with the radial tires? Is 10 lbs safe for that type of sidewall/bead?

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Dusty

06-16-2004 05:23:06




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 Re: Radial Tires, How low can you go? in reply to Kevin, 06-14-2004 19:41:28  
12 volt air compressors are slow but work and take up little space to haul.

Dusty



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Ryan

06-15-2004 05:10:23




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 Re: Radial Tires, How low can you go? in reply to Kevin, 06-14-2004 19:41:28  
What the manufacturer is attempting to do is to provide some kind of shock relief on the empty dolly. When there is a car on it there is enough weight to keep it on the ground and the tires will flex to take up some of the shock. But when it is empty it is so light that it will bounce all over the place. There suggestion is to let air out of the tires to make them softer and therefore make the ride a bit smoother. One other thing that I have seen done which worked fairly well was to rig up a mounting system for each ramp that could hold a 55 or 30 gallon drum laid sideways. Fill up the drums with water when you have to haul it empty and then drain them and throw them in the truck bed when you load a car.

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Ron

06-14-2004 23:40:11




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 Re: Radial Tires, How low can you go? in reply to Kevin, 06-14-2004 19:41:28  
You should follow the dolly manufacturers instructions exactly. It only take a few psi to keep the bead from unseating and when hauling empty there is almost no weight on the tires so the more air you put in them the more the dolly will bounce. Bias vs. radial means nothing here.

I don't know amything about your setup but I pertsonally wouldn't be towing anything with 6 ply tires. Those are car tires and unless recommended by the dolly manufacturer, they would not seem safe. 8 ply (load range "D") are the minimum generally recommended for towing.

To eliminate the need to find air, buy an air tank and haul it with you. Most auto parts stores sell them. Be sure to size it to the size of your tires.

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jon

06-17-2004 15:06:16




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 Re: Re: Radial Tires, How low can you go? in reply to Ron, 06-14-2004 23:40:11  
Most car tires are two ply nowadays.6 ply would have an LT light truck rating.



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Don-Wi

06-16-2004 20:24:36




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 Re: Re: Radial Tires, How low can you go? in reply to Ron, 06-14-2004 23:40:11  
I know it aint the same thing, but you'd be surprised how much a car tire can hold. We use lots of used car tires on our hay wagons/ etc. and they hold just fine with a 5-7 ton load on them. They only blow when they are dry & weather checked. Donovan from Wisconsin



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Kevin

06-15-2004 17:24:20




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 Re: Re: Radial Tires, How low can you go? in reply to Ron, 06-14-2004 23:40:11  
I used the term "6 ply" off the top of my head to imply Bias tires rated for over 1000 Lbs. They are the tires that came from the factory, and are in all likelyhood load range "D". Thanks for the input!



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