top of page

Think the valet could park this one?

Asking correct questions is paramount. Vocational chassis are tied to local, state, federal bridge and/or permit requirements. The largest payload, is understanding what's allowed.

Vehicle weight ratings are not the same as the local/state or federal highways. Sales folks are absolutely key to designing the correct chassis so finding that person is imperative. Proper specing plus the OEM that can build the correct combination is key. Not all OEM's offer the same options and utilize the same design criteria.

Some requirements can be different than DOT enforcement. Example, tire patch. Axle weight can be tied to tire width, but DOT may use the stamped rating. Example 315/80R22.5, 10K steer tire, however the state has a 600 lb/in requirement, so 315 divided by 25.4" = 12.4" wide X 600 =7,440 lbs. 14,880 vs. 20,000 is significant.

You may have to spec a 425/80R22.5 that is 16.7" wide X 600 = 10,020. Federal Bridge allows 20K/axle, so this tire would be required along with a 12.25" wide wheel with the appropriate offset and axle width for the best turning radius.

If the federal, state, local bridge formulas are not taken into account, the chassis might not offer the best payload. 1" different wheel base can make a 500/1,000 or up to a 8,000 lb. difference. Vocational chassis moving between these areas make proper specing a challenge. Collaboration with the customer for the correct weight is paramount. Reach out if we can help you.

2 views0 comments

Recent Posts

See All




bottom of page