By extending the seat tube until it meets a horizontal line from the top tube / head tube joint. No?
Bugger it. I'll measure my frame with a ruler. Can't make head or tail of those figures.
@Yemble started
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By extending the seat tube until it meets a horizontal line from the top tube / head tube joint. No?
Bugger it. I'll measure my frame with a ruler. Can't make head or tail of those figures.