Bert
571.110 S2.2.1 says "except as noted in S4.2.2.2, the sum of the maximum load ratings of the tires fited to an axle shall not be less than the GAWR of the axle system as specified on the vehicles certification required by 49 CFR part 567 (FMVSS placard reg). If the certification label shows more than one GAWR for the axle system, the sum shall be not less than the GAWR corresponding to the size designation of the tires fitted to the axle".
This ties tires capacity and GAWR. Also see S4.3.3
See 571.3 for GAWR definitions.
NHTSA regs 571.110 refere to GAWR and tires capacities.
How FMCSA/FMVSS/NHTSA regs are interpeted by the states can be argued from now on unless one goes to their state for guidense on how they interpet and enforce those regs.
Does your province/Canada even recognize any of the above regulatories ??
JIM
