What is seat tube length?
Seat tube length is the straight line distance between the centre of the bottom bracket and the top of the seat tube.
What is the seat tube center top measurement?
Seat tube length
The first measurement is from the center of the bottom bracket to the center of where the seat tube and top tube connect. This measurement is called Seat tube length (c-c). The second measurement is from the center of the bottom bracket to the top of the seat tube. This measurement is called Seat tube length (c-t).
How is seat tube length measured?
Seat Tube Length is a measurement from the center of the bottom bracket up to one of several possible points along the seat tube axis: Effective (HT Top): The “effective” or “virtual” length of the seat tube measured to where it intersects an imaginary horizontal line originating from the top of the head tube.
Is frame size seat tube length?
Frame Size Bike frames are commonly measured in centimetres or inches representing the length of the seat tube. For example, a manufacturer may measure the seat tube length of a bike as 51cm, and then describe it is a small frame.
What does a longer top tube do?
“For a racing bike, usually riders like to have a very low handlebar or hand position. On a competition road racing frame, we have a longer top tube and shorter head tube, just to have the position in the front lower and further to make sure they can really lay down on the bike to be as aerodynamic as possible.”
What does a longer top tube mean?
When seated, seat tube angle and top tube length define your position fore and aft. A steeper seat tube angle helps achieve this. The TT length plus stem length defines how stretched out you are – for sustained climbing, most people will prefer a bit more space in the cockpit.
How do you measure seatpost length?
The length of the post that comes out of the frame is known as the stack height. This is the distance from the top of the seatpost collar to where the seat rails would be in the saddle clamp if the post was all the way inserted in the frame.
How important is top tube length?
While effective top tube length provides a good idea of the overall length of the frame, it will be influenced by the angle of the seat tube, increasing as the angle gets slacker.