Cube - Protrusion Height 80mm

[rualexander]

Looking at Cube bikes geometry charts and they list stats for "Protrusion Height - 80mm"
It looks like this is the stand over height but I'm trying to work out what the 80mm refers to and also why they call it Protrusion Height.
Anyone know?

 

[Stefan Mikes]

'The fact that the stride length and height can only serve as a guide for sizing is also due to the fact that bodies have individual characteristics. Some people have particularly long arms, torsos or legs. So it can happen that someone should ride a smaller frame height according to body size, but the particularly long legs speak for a larger frame.'

A parameter called Stand-over Height is more useful. It is the distance from the ground to the part of the top tube where the rider is standing over. You can measure your own standover height by standing in cycling shoes back to the wall with a book between your thighs and into the crotch (the feet should be apart). Someone should mark the book spine position on the wall. If your own standover height is greater than the one listed by the bike manufacturer, the e-bike is proper for your leg length.

 

[rualexander]

Thanks, but I know what stand over height is and that is what most manufacturers use.
I still have no idea what Cube mean by "Protrusion Height - 80mm"
If they mean stand over height as it's normally defined then why don't they call it that.
What does the 80mm refer to?

 

[Stefan Mikes]

I'd say it is the vertical distance between the top tube and 'Top Tube Horizontal' line.

 

[BlackHand]

I think they are telling you standover height at 80mm forward of the point of a vertical line up from the bottom bracket. Usually you have to guess where they are measuring standover height.

Look at the chart, the protrusion height label has a line going back to the same vertical that is used for the reach measurement. That's the 80mm, though it does not look proportional in the schematic.