APPLICATION
Vocation?
Full Truck or Tractor?
Sleeping Compartment?
Select a Vocation
Truck or Tractor
Truck or Tractor
Imperial Weights
Metrics Weights
Desired Total GCW/GVW?
<- ENTER VALUE IN POUNDS
Desired Steer GAWR?
<- ENTER VALUE IN POUNDS
Desired Total Drive GAWR?
<- ENTER VALUE IN POUNDS
Steer Axle?
Select Front Axle Style
Rear Axle Style?
Select Rear Axle Style
Lift Axle Required
Weight > GAWR or Fed Bridge
Lift Axle/s?
Adding a lift axle allows you to increase GCW/GVW or shorten the wheelbase
No lift axle is being considered
Bridge Law/Permit?
Select Applicable Bridge Laws or Permits
Inches
Millimeters
WheelBase?
Inches measured from centerline of front axle to center of the rear axle group defined under Rear Axle Style.
Rear Axle Spacing?
Spacing should be close as possible for best tire wear, at least 54 inches for most lift axle applications.
FAX to Back of Cab
Enter inches. Varies by model and axle setting. Used to arrive at wheelbase requirement and load space.
Cab to Body Gap
If vehicle is a semi-tractor then this field should be zero. Enter inches for trucks with a body.
Body Length
If vehicle is a semi-tractor then this field should be zero. Enter inches for trucks with a body.
Body Front to Bogie/Trunnion
Takes into account the gap value. Use a zero for Cab to Body Gap if you want to calculate cab to axle.
Cutoff/After Frame (Min)
Tractor values are static. Typically used for bodied trucks.
Inches
Millimeters
Overall Bridge
Review Bridge Law to verify the Overall Bridge for calculated Axle Count and compare to Desired GCW/GVW.
Axle Count
Calculated value.
Minimum Tractor Wheelbase
Does not take into account lift axles, vertical exhaust behind cab/sleeper, or trailer swing/dip clearances.
Constraints Messages- click on constraint to address issue
1. Typical front axle rating must exceed 13,000 lbs. with a sleeper larger than 75 inches.
2. Federal Bridge allows rounding up to next foot with half feet increments.
3. Reduce Desired Total GCW/GVW to eliminate lift axle requirement
Desired Total Drive GAWR