Crank Geometries

 

Figure 1: Image showing connecting rod length	Figure 2: Image showing stroke  (Stroke is also difference of piston height at TDC minus BDC)

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Below is a collective table of many of the common crank geometries, their rod length (either 89mm long rod or 85mm short rod), and their strokes (38mm, 40mm).

Crank Rod Stamp	Rod Length	Stroke (+-0.5mm)
ZL40MM	89mm Long	40mm or 38mm
AF80	89mm Long	38mm
Zeda-80	89mm Long	40mm
No Mark	85mm Short	40mm
Z-L	85mm Short	40mm
ZAE-50	85mm Short	38mm
ZMN80	89mm Long	40mm or 38mm

 

This list may not be 100% up to date or accurate. China often changes and mixes up crank parts causing random variations of these. Please measure yourself to be sure.