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Archive for October, 2006
Correct Tire Inflation
Posted by Robert on October 19, 2006
I have a 2006 Freightliner 265 wheelbase with Goodyear G372 LHD 285/75R 24.5 drives. I run with approx.31000 lbs on the drives about 85% of the time. What is the best inflation pressure for wear and mileage??
The key to your question is the comment about running 31,000 lbs, 85% of the time. I assume this means that 15% of the time, your drive axles are loaded to something more than 31,000 lbs. Unless you plan to raise and lower your pressures based on the load being carried, you should sent your pressures based on the highest loads you expect. For a tire, overloaded or underinflated has the same effect, potential casing damage even if it happens only a small percentage of the time.
Tires Cupping
Posted by Glenn on October 18, 2006
I have a 2003 ford sport trac 4x4 the front tire had to be replaced because the were cupping on the inside edge of the tire. I had the font end checked for any worn parts and all was fine. I have wrangler rt/s on the Truck. The salesman at the tire place said it was very important to rotate the tires on this vehicle every 6000 miles. Then, a mechinic told me that it was from running my truck with the four wheel drive for long distances or all the time . I only use four wheel drive when I needed it in a snow storm. I don’t run it when I don’t need it. So who is right?
This question does not relate to type of trucks I am personally familiar but, I will offer an opinion. I agree with the guy that says rotate the tires at least every 6000 miles. I would do this on any passenger car or light truck but particularly a 4X4 truck with tires that have an agressive tread pattern.
22.5 LP vs 22.5
Posted by Samuel on October 18, 2006
Will 22.5 tires fit on trucks that have 22.5 low profile tires on them?
I would check with the vehicle manufacturer but, in most cases, there should be no fitment problems. Don't forget that a tire of a different diameter will affect your gearing as well as the speedometer and odometer readings.
Super Single Tire Wear.
Posted by Joel on October 18, 2006
I have a customer that wears the inside of all 4 Super Single tires. This is a reefer fleet with Hendrickson AK40 VANTRAX suspension. It’s so bad that after 50,000 miles he flips the tire on the rim and maybe will get another 50,000 if he is lucky. I have done camber checks on the axles empty and loaded. Empty they camber was zero and toe in was zero. Loaded but not over loaded it went -3/8 to -5/8. Hendrickson says this will not affect the tire wear unless it is 1 to 2 degrees different when loaded.
We also do a lot of front end alignments on tractors and if we were to use these settings the tire would not last 30,000 miles. I feel that the trailer is doing about the same as a steer axle would on a tractor. What are your thoughts on these camber settings?
This was not a question I felt comfortable answering. To do so, I asked Mike Beckett, of MD Alignment Services for his thoughts. Mike is highly regarded in the trucking industry as an expert on alignment related issues. Here is Mike's response:
"We are hearing this complaint more and more. With duals it does not seem as severe as with the new super wides. There are two different possible causes.
First, the axles can be flexing and inducing more camber than the tire can tollerate. Negative camber over 1/4 degree on the new super wides cause inside wear and the 2 inch off set rims most users are putting on to set the wheels out cause more axle flex. This combination of an overly sensative tire and an increase in the flex of the axle due to the off set rim makes for a real problem in tire life. I agree with your writer that cambers in the range he listed would not be acceptable and the amounts indicated by Hendrickson are correct If you are referring to total combined camber. The 5/8 camber indicated by your writer would mean the total combined camber would be 1 and 1/4 degree."
The second possible cause is an improperly adjusted wheel bearing. A bearing that is too loose can cause the same conditions as excessive axle flex.
Super Single Tires
Posted by Brenda on October 16, 2006
My construction company uses a Ford F-250 with an excellent towing package to haul heavy equipment. We have been putting 70 lbs. of pressure in the rear tires for the time being, but have been considering replacing the rear tires with “super singles”. Do you know if there are any problems that will arise in doing this?
To my knowledge, the tires that the trucking industy considers to be "super singles" or "wide base tires" would certainly not fit on a Ford F250. If you are talking about replacing two drive axle tires with one very wide, single tire, it wouldn't strike me as a great idea on a working truck. It would look cool, though.