WindomEarles
New member
I'm confused! Why do p rated tires support more weight than c? Wtf?
Why does p rated tires support more weight than c?
- Thread starter WindomEarles
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1engineer
Moderator
You have a right to be confused. It depends on size, width, construction, etc. As a rule of thumb for a tire the same size (say our OEM size) a C will normally have a higher load rating than the OEM P rating. It really can get confusing quick if you do not compare the same exact tire in the same exact size from the same manufacturer. Read this Load & Inflation Tables | Toyo Tires (click on link for load tables in middle of page to open .pdf file) first for a general tire education 101. If you do not care to read it and understand it you will have to rely on strangers on the internet to answer your questions and hope they know what they are talking about.
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WindomEarles
New member
How does a BFG AT KO c rated support less weight than the stock Bridgestone? This is horrifying!
JB.
New member
Because they create and retain less heat and use rubber formulations more compatible with flexing.
Comes from <a href="http://www.toyota-4runner.org/general-discussions/110300-ask-tire-engineer.html" target="_blank">this</a> guy.
WindomEarles
New member
Then what's the point if it can't handle more of a load? Seems like e is the only way to go for an LT tire
1engineer
Moderator
Did you not read?
JB.
New member
It can but it requires more air pressure. If you look at the large amount of load reserve in the stock P tire, you'll see it has more load capacity than you'd ever need.
http://www.toyota-4runner.org/general-discussions/110299-lt-tires-need-more-air-pressure.html
WindomEarles
New member
I read it. Bottom line is that the stock size c rated tire maxes out at 2470@50psi. The stock Bridgestone max out a 2535@44psi. Correct me if it wrong.
Seems like if I went LT tire, E rated is the way to go.
JB.
New member
Go back and do a text search for the word derated. The 2535 is really 2305.
Gonna be smuggling gold bullion in lead urns or something?
As Jeremy posted earlier, the load ratings for P rated tires are reduced by 9% when used on trucks and SUVs (per the tire manufacturers). That means that your stock Bridgestones ratings are really,
rating = 2535 * .91 = 2307lbs (which is less than the c rated tires)
Why do you need he heavier rating?
WindomEarles
New member
I don't need to support more weight, but I want to ensure that I'm not not going to a tire that supports less weight.
I did see the line about the weight reduction for p rated when put on a truck/suv.
It all makes sense now! Thanks! C rated would be more than sufficient.
