F450 vs F350 SRW payload
I'm looking at the technical specs of the 2020 Super Duty and found the F450 4x4 has a curb weight of 8,587 lbs which is 855 lbs more than the F350 SRW crew cab long box with the 6.7 Powerstroke. The ...
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Grit dog wrote:
Not sure I agree with tire load ratings not having a factor of safety applied to them.
As an Engineer, I can't think of a single assembly or component of most anything that isn't designed with a factor of safety. With the exception of intentional "weak links", for example shear pins. You want to rely on it breaking at a certain stress to protect the rest of the assembly from overloading.
I'll say tires 100% have a substantial factor of safety built into their published load ratings.
While everything has some form of factor of safety, what I meant is tire ratings are never "sandbagged" for marketing purposes.
In the context of OEM axle and GVW ratings, where ratings are low to meet a "class" or boost sales of a higher class - I've never seen Michelin sand-bag a 245/75r16's rating to boost sales of 265/75/16 tires! So we can safely assume all tire ratings of equal factors of safety.
This is not the case with the axle - as per Ford's chart, an F450 rear GAWR has nearly 200% factor of safety, ON TOP OF whatever factor of safety is already built into the axle (as we ca safely assume the F550 won't fail at 50 lbs over rating).
