English to German Tech/Engineering Mechanics / Mech Engineering Conveyors

The radius of roller section 244 may be chosen such that the roller surface 254 is in contact with the second surface 212 of the belt, and/or the neutral axis of the second surface 212 of the belt 208 may be substantially the same **pitch diameter** as the first row of teeth 230 and the second row of teeth 232.
Pitch diameter for a geared belt is defined as a circle with a circumference equal to the number of gear teeth multiplied by the tooth pitch.
Tooth pitch is the machine direction spacing between adjacent teeth.
The pitch diameters of the first row of teeth 230 and the second row of teeth 232 may be substantially equal, although the tooth pitch may be unequal if a different number of teeth are chosen for the first row of teeth 230 and the second row of teeth 232.

I found Durchmesserteilung, Teilkreisdurchmesser and Wirkdurchmesser.
But it is always the pitch diameter of the pulley not the belt. What is the correct term for "pitch diameter" here?

TIA