CAT Scale numbers (still a newbie to towing)
I had my tow vehicle and trailer weighed today on a CAT scale today. Steer Axle - 3220 lbs Drive Axle - 4320 lbs Trailer Axle - 6040 lbs The UVW of the trailer is 6204 lbs but we do have a coup...
Forum Discussion
lawrosa wrote:Guess I missed your tires load rating in my reply above but divide the 2601 lb number by 1.1 = 2365 lb capacity for your P tires.
OEM already derates the tires AFAIK.. His tire rating is what it says on the side wall.. 2601 @ 44 psi.
Ill find documents supporting this if needed.. After all your not going to fit a 265 70 r 17 on a car are you.
A OEM tire or a replacement tire have the same load rating stamped on the sidewall.
You won't find a credible document stating that the P tires sidewall load capacity is a reduced number.
RMA
Chapter 3 - Tire Replacement Guidelines
Tire Size, Inflation & Load..........Chapter 3, page 37
Passenger tire load carrying
capacity must be reduced by dividing by
1.10 for light truck applications. For example:
P235/75R15 which has a maximum load capacity for
passenger vehicle application = 2028 lbs. For a light
truck application, using the formula, the maximum
load capacity would be 2028 / 1.10 = 1844 lbs.
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per 49 CFR FMVSS safety regs 571.110
S4.2.2.2 When passenger car tires are installed on an MPV, truck, bus, or trailer, each tire's load rating is reduced by dividing it by 1.10 before determining, under S4.2.2.1, the sum of the maximum load ratings of the tires fitted to an axle.
