My hand next to one of the cranks to show its size.
https://cdn.masto.host/velocipederidercom/media_attachments/files/112/656/748/492/443/458/original/eb44b123591f0f44.jpg
I'm just trying out my little baby cranks again after a couple of years. These things are only 75mm long. On my penny farthing I use 150mm cranks. Normal bike cranks are usually in the 165-170mm range.
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