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And something else. Tires that see continuous mountain use wear VERY different from straight road driving where high side loading isn't encountered. So unless you drive mountain roads all the time like I do don't tell me how my tires should wear.
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Originally Posted by toobroketoretire
(Post 1590353992)
I looked at the Tire Rack's website to see what they say about tire sizes, load ratings, and inflation pressures.
The maximum load carrying capacity and tire pressure required for that maximum load is shown on the side of the tire. An example would be 1875 pounds @ 35 psi. For less load less pressure is required in a proportional amount which is EXACTLY WHAT I TOLD YOU. At highway speeds the big 255X60R15's on a 3600 pound C3 only require 20-22 psi. If you want to run the tire at it's maximum rated 115 mph speed then it does require the maximum pressure for safety reasons. Don't argue with me...............argue with the tire experts and those experts aren't you guys! http://media.michelinman.com/content...ight_Truck.pdf |
Originally Posted by toobroketoretire
(Post 1590354012)
So unless you drive mountain roads all the time like I do don't tell me how my tires should wear.
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Question
Originally Posted by toobroketoretire
(Post 1590353992)
I looked at the Tire Rack's website to see what they say about tire sizes, load ratings, and inflation pressures.
The maximum load carrying capacity and tire pressure required for that maximum load is shown on the side of the tire. An example would be 1875 pounds @ 35 psi. For less load less pressure is required in a proportional amount which is EXACTLY WHAT I TOLD YOU. At highway speeds the big 255X60R15's on a 3600 pound C3 only require 20-22 psi. If you want to run the tire at it's maximum rated 115 mph speed then it does require the maximum pressure for safety reasons. Don't argue with me...............argue with the tire experts and those experts aren't you guys! |
All these pages talk about how important it is to use the vehicles recommended pressure and also talk about how using low pressures in the 20-25psi range hurts the wet and dry handling.
http://www.tirerack.com/tires/tirete...e.jsp?techid=3 http://www.tirerack.com/tires/tirete...jsp?techid=196 http://www.tirerack.com/tires/tirete...e.jsp?techid=1 Here is info on pressure vs speed. http://www.tirerack.com/tires/tirete....jsp?techid=72
Originally Posted by Tire Rack
The European Tyre and Rim Technical Organization (ETRTO) establishes the standards for tires sold in Europe, and recognizes that the tire's deflection must be minimized and controlled in order to surpass high speed driving stresses. In order to accomplish this, the tire inflation pressure recommendations and the tire's rated load capacities are customized when speeds exceed 160 km/h (99 mph) for all tires up to and including a V-speed rating, and when speeds exceed 190 km/h (118 mph) for all tires that are Z-speed rated and above.
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Originally Posted by toobroketoretire
(Post 1590353992)
The maximum load carrying capacity and tire pressure required for that maximum load is shown on the side of the tire. An example would be 1875 pounds @ 35 psi.
For less load less pressure is required in a proportional amount which is EXACTLY WHAT I TOLD YOU. Post one reputable link that says this - To select the proper inflation pressure take the tire load, divide by the rated load and multiply by the rated pressure. This is your example - psi = 900/1875 * 35 = 17 Go, find one reputable link that says you're supposed to do the above to determine the proper inflation pressure. To avoid wrongly interpreting some information, you need to post a reputable link that has the above formula specifically spelled out. |
With 20# .... What happens when you hit a dip or bump and 70 % of the car's weight is on the front or rear wheels? oops:D
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I swore I would not jump into this thread (probably will regret it) but to anyone who might be casually reading parts of this thread I want to say only one thing:
If you want to experiment with these low tire pressures, please do NOT do it on a motorcycle. |
Originally Posted by C3Hawk
(Post 1590366354)
I swore I would not jump into this thread (probably will regret it) but to anyone who might be casually reading parts of this thread I want to say only one thing:
If you want to experiment with these low tire pressures, please do NOT do it on a motorcycle. |
35-36psi
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Originally Posted by toobroketoretire
(Post 1590354012)
And something else. Tires that see continuous mountain use wear VERY different from straight road driving where high side loading isn't encountered. So unless you drive mountain roads all the time like I do don't tell me how my tires should wear.
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Checked my bfg 255-60-15 tires that have around 20,000 miles on them and some road course and auto x time on them. With 35 psi in them the rear had the most wear inboard was 7/32, center 6/32 and outer was 8/32. Front was 8/32 inside and out side area and 7/32 on the inner area of the tread. So there is some additional wear in the center but it's very small. I think maybe a slightly lower air pressure may wear more evenly but I thank that number may be around 32 psi.
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Uh, I started this thread to find out what kind of pressures YOU run.
The air pressure needed for a tire is dependent on the load the tire is carrying. The big 255-60R15's have a maximum load rating of about 1875 pounds when inflated to 35 psi. But when placed on the rear of a C3 its only carrying about 900 pounds, right? That means the pressure needed is only half of that 35 psi or about 17-1/2 pounds but I choose to run a much higher 20 psi. And hitting a "dip"? That is a momentary load only. An inflation pressure of 35 psi is way too high for even the obsolete F70-15's that the C3's used to run in the late 1960's. |
Originally Posted by toobroketoretire
(Post 1590384299)
But when placed on the rear of a C3 its only carrying about 900 pounds, right? That means the pressure needed is only half of that 35 psi or about 17-1/2 pounds but I choose to run a much higher 20 psi.
NEVER use under 80% of maximum tire pressure. |
:rofl: Big surprise. Still no link to this source that said less pressure is required with less load.
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Originally Posted by lionelhutz
(Post 1590385366)
:rofl: Big surprise. Still no link to this source that said less pressure is required with less load.
This is a good summary: http://www.agcoauto.com/content/news/p2_articleid/61 |
Originally Posted by Big2Bird
(Post 1590385063)
You will never be able to provide any engineering source for this "theory." NEVER use under 80% of maximum tire pressure. "Theory"? Its not a theory, its a fact. The maximum load rating and pressure required IS A MAXIMUM LOAD RATING and the only way a C3 can ever reach that load is to do jumping like the "General Lee" did in the Dukes Of Hazard TV series. A tire that carries 1/2 of it's maximum load only requires 1/2 the maximum pressure and everyone in the tire industry knows it. Its people like you who get your bad information from other people who don't know who are grossly over inflating your tires and killing them. So where on earth did you get your 80% figure? |
Originally Posted by toobroketoretire
(Post 1590385488)
"Theory"? Its not a theory, its a fact.
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Originally Posted by toobroketoretire
(Post 1590385488)
So where on earth did you get your 80% figure? Try reading this article: http://www.agcoauto.com/content/news/p2_articleid/61 |
I give up. Trying to reason with you is like trying to reason with a door knob.
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