What is the bike's seat tube length?

Crank-arm length + seat-tube length + seatpost insert length + saddle rails-to-seat distance = 820mm (as a first approximation

Originally Posted by

**Papaformigas**
Hi again..

I am having trouble finding a correct seatpost to my bike.

The current seatpost is 400mm

My inner leg distance is 870mm

Can someone tell me what seatpost length should I get?

I talked with a guy that messes with alluminum and steel in order to make me a seatpost tube but then don't know if it will fit the saddle...

Any help...