Originally Posted by TravisNuwa81
Hey all, I've come across a great deal on some like new Blizzak stud less tries for my truck, but they are load range C. Will this be sufficient?
Probably, but it depends on the weight capacity of the tires compared to the max probable load on the tires.
I like at least 25% excess tire weight capacity compared to the max load on the tires. And as a result I rarely have tire problems on long road trips. I can't even remember the last time I had a blowout, but it was more than 20 years ago.
Example: Tires in size LT275/65R18C have max weight capacity of 2,535 pounds @ 50 PSI.
2535 x 2 = 5070 minus 25% = 3802.5 pounds max rear axle weight.
So if your rear GAWR is less than about 3,800 pounds, then that tire would be fine for your pickup and give you about 25% excess weight capacity per tire. That's assuming you're not so dumb that you exceed the rear GAWR of your pickup.
But if your rear GAWR is more than about 3,800 pounds, then you should go for the LT275/65R18E, which has max weight capacity of 3,415 pounds @80 PSI. 3415 x 2 = 6830 minus 25% = 5122.5. Those load range E tires would give you weight capacity of over 5,000 pounds on your rear axle and still maintain over 25% of excess tire weight capacity.
What? Even the load range E tires won't give you 25% excess tire weight capacity. Then don't even think about putting those lightweight load range C tires on your tow vehicle.