JIMNLIN wrote:
JMO but there is no smoking gun how the truck mfg arrives at a GVWR or the GAWRs. The vehicle mfg may choose any number they want.
Some thing are know per the FMVSS.
Tires and rims are selected per the truck makers GAWR (not a GVWR). 571.120 says;
"...the sum of the maximum load ratings of the tires fitted to an axle shall be not less than the gross axle weight rating (GAWR) of the axle system as specified on the vehicle's certification label required by 49 CFR part 567.
We see much gets posted that the sum of the GAWR's can never = the trucks GVWR.
Fords body builder spec in the super duty 250/350 pages in note #4 says;
"4) *Gross Axle Weight Rating is determined by the rated capacity of the minimum component of the axle system (axle, computer-selected springs, wheels, tires) of a specific vehicle. Front and rear GAWRs will, in all cases, sum to a number equal to or greater than the GVWR for the particular vehicle. (snip)*
Read close where its saying the sum of the GAWR can equal to its GVWR.
The F350 SRW is a great example of a truck having several different GVWRs with the same size wheels and tires.
Example is a F350 SRW crew cab 4x4 6.7 174" wheelbase 6290 RAWR 5600 FAWR 17" tires and wheels with a 11200 GVWR or 10000 GVWR.
IMO its fruitless trying to figure why or how a truck makers arrives at a GVWR or the GAWRs for a particular truck.
Ding, ding, ding..chicken dinner
