Ratio of facewidth to pinion diameter

Symbol	b/d₁
Unit	-
Attribute-ID	vdi_2736_2014_initial_design_width_diamater_ratio
Numeric ID	10677
Value Type	PMDouble

According to VDI 2736, b/d₁ should be in the range between 0.2 and 2.0.

Source: VDI 2736:2014-06 Sheet 2