Width ratio

Symbol	b/m_n
Unit	-
Attribute-ID	vdi_2736_2014_initial_design_width_ratio
Numeric ID	10618
Value Type	PMDouble

According to VDI 2736, b/m_n should be in the range between 5.0 and 20.0.

Source: VDI 2736:2014-06 Sheet 2