Seat Tube Angle
04-30-05, 10:31 AM
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Seat Tube Angle
There is much talk about geometry on this forum. I think I understand it relatively well, however, seat tube angle is spoken of much, and I really don't understand why. After all once you know your preferred seat tube angle, it shouldn't change.
Isn't seat tube angle just a product of your femur length, and to a much lesser degree your cleat placement, and shoe size? Obviously, some riders prefer to be over the pedal axle more, or behind the pedal axle more given their preference, and the type of bike (TT vs. road for example). However, regardless as to the size of your frame, you should choose the same seat tube angle. In other words, the distance from the center of the crank to the top of the saddle (driven mostly by total leg length, and preference) is the same regardless as to frame size. Therefore, you should always choose the same seat tube angle regardless as to the size of the frame, as it (seat tube angle) is based on anatomy, and preference.
So, other than riding type (TT/Tri vs. road vs. crit, etc) your seat tube angle should remain the same. Right?
Isn't seat tube angle just a product of your femur length, and to a much lesser degree your cleat placement, and shoe size? Obviously, some riders prefer to be over the pedal axle more, or behind the pedal axle more given their preference, and the type of bike (TT vs. road for example). However, regardless as to the size of your frame, you should choose the same seat tube angle. In other words, the distance from the center of the crank to the top of the saddle (driven mostly by total leg length, and preference) is the same regardless as to frame size. Therefore, you should always choose the same seat tube angle regardless as to the size of the frame, as it (seat tube angle) is based on anatomy, and preference.
So, other than riding type (TT/Tri vs. road vs. crit, etc) your seat tube angle should remain the same. Right?
04-30-05, 12:09 PM
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Originally Posted by bac
So, other than riding type (TT/Tri vs. road vs. crit, etc) your seat tube angle should remain the same. Right?
04-30-05, 02:20 PM
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Originally Posted by sydney
Tough to generalize about a single aspect of geometry.
05-01-05, 09:16 AM
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Originally Posted by sydney
Doesn't have to.The angle can be compensated for by moving the seat for or aft,assuming you have HT length to work with to be able to get proper reach to the bars without major anomalies in stem length.Many people move the seat forward on lemonds a bit,therefore negating the Lemone 'long toptube'. On a steep angeld Gios(some models),the seat usually goes back a bit,effectively lengthing the short Gios TT. Tough to generalize about a single aspect of geometry.
