D-Value ISO Calculator




  • ISO Combination 1
  • ISO Combination 2
  • ISO Combination 3
  • ISO Combination 4
  • ISO Combination 5

ISO Combination 1: truck + dolly + A-semi

ISO Combination 1: truck + dolly + A-semi
Cd = Ud + Wd; Smax = 1000kg
T =
Cd =
Rb =
Ud =
Wd =
L =

For a correct calculation only decimal places are separeted with points.

Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Perm. Total weight of the truck in t)

Mass (t) transmitted to the ground by the axles of the converter dolly including Ud (t). (Sum of the masses of the dolly t)

Mass (t) transmitted to the ground by the axles of the semi-trailer loaded to its maximum total design mass. (Sum of the perm. maximum axle loads of the trailer in t)

Mass (t) imposed vertically on the fifth wheel of the converter dolly. (Imposed load that affect on the fifth wheel dolly)

Dolly tare mass (t).

Theoretical dolly drawbar length (m), i.e. the distance between the center of the drawbar eye and the center of the axle assembly.


ISO Combination 2: tractor + A-semi + centre-axle trailer

ISO Combination 2: tractor + A-semi + centre-axle trailer
T =
C =
Rb =
Ut =
L =
X =
a =

For a correct calculation only decimal places are separeted with points.

Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Perm. Total weight of the truck in t)

Mass (t) transmitted to the ground by the axles of the center axel trailer.

Mass (t) transmitted to the ground by the axles of the semi-trailer loaded to its maximum total design mass.

Mass (t) imposed vertically on the fifth wheel of the tractor. (Imposed load that affects the truck in t)

Theoretical drawbar length (m) of center axel trailer, i.e. the distance between the center of the drawbar eye and the center of the axle assembly.

Length (m) of the loading area of the center-axle trailer.

Equivalent vertical acceleration in the coupling point, dependent on the kind of suspension on the rear axles of the towing vehicle including a constant factor. Air suspension and or equivalent a=1.8m/s2 and other suspension a=2,4m/s2.


ISO Combination 3: tractor + A-semi + centre-axle trailer

ISO Combination 3: tractor + A-semi + dolly + A-semi
T =
Cd =
R1b =
R2b =
Ud =
Ut =
Wd =
L =

For a correct calculation only decimal places are separeted with points.

Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Perm. Total weight of the truck in t)

Mass (t) transmitted to the ground by the axles of the converter dolly including Ud. (Sum of the masses of the dolly t)

Mass (t) transmitted to the ground by the axles of the semi-trailer1 loaded to its maximum total design mass. (Sum of the perm. axle loads of the semi-trailer1 in t.)

Mass (t) transmitted to the ground by the axles of the semi-semi2 loaded to its maximum total design mass. (Sum of the perm. axle loads of the semi-trailer2 in t.)

Mass (t) imposed vertically on the fifth wheel of the converter dolly. (Imposed load that affect on the fifth wheel dolly)

Mass (t) imposed vertically on the fifth wheel of the tractor. (Imposed load that affects the truck in t)

dolly tare mass (t).

Theoretical dolly drawbar length (m), i.e. the distance between the center of the drawbar eye and the center of the axle assembly.


ISO Combination 4: truck + centre-axle trailer + centre-axle trailer

ISO Combination 4: truck + centre-axle trailer + centre-axle trailer
T =
C1 =
C2 =
X1 =
L1 =
t1 =
X2 =
L2 =
a1 =
a2 =

For a correct calculation only decimal places are separeted with points.

Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Perm. Total weight of the truck in t)

Mass (t) transmitted to the ground by the axles of the CAT1. (Sum of the axle loads of the CAT1 in t)

Mass (t) transmitted to the ground by the axles of the CAT2. (Sum of the axle loads of the CAT2 in t)

Length (m) of the loading area of the CAT1.

Theoretical drawbar length (m) of CAT1, i.e. the distance between the center of the drawbar eye and the center of the axle assembly.

Distance (m) from the center of axles of CAT1 to its rear coupling point.

Length (m) of the loading area of the CAT2.

Theoretical drawbar length (m) of CAT2, i.e. the distance between the center of the drawbar eye and the center of the axle assembly.

Equivalent vertical acceleration in the coupling point, dependent on the kind of suspension on the rear axles of the towing vehicle including a constant factor. Air suspension and or equivalent a=1.8m/s2 and other suspension a=2,4m/s2.

Equivalent vertical acceleration in the coupling point, dependent on the kind of suspension on the rear axles of the towing vehicle including a constant factor. Air suspension and or equivalent a=1.8m/s2 and other suspension a=2,4m/s2.


ISO Combination 5: tractor + link trailer + A-semi (B-train)

ISO Combination 5: tractor + link trailer + A-semi (B-train)
T =
R1b =
R2b =
UT =
Ub =

For a correct calculation only decimal places are separeted with points.

Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Perm. Total weight of the truck in t)

Mass (t) transmitted to the ground by the axles of the link-trailer loaded to its maximum total design mass. (Sum of the perm. axle loads of the semi-trailer1 in t.)

Mass (t) transmitted to the ground by the axles of the semi-trailer loaded to its maximum total design mass. (Sum of the perm. axle loads of the semi-trailer2 in t.)

Mass (t) imposed vertically on the fifth wheel of the tractor. (Imposed load that affects the truck in t)

Mass (t) imposed vertically on the fifth wheel of link-trailer.