Sorry Dave7348 but you are wrong, the centre of hip rotation is below the surface of the skin, so this point on the surface will never be stationary. The top of the greater trochanter is generally regarded as a best approximation and the guidelines have been established using observation of this point.
The hip "spot" is not on the centre of the hip hinge point. It should be stationary, but isn't - it's going up and down, thus negating all the angle measurements.
Agreed. Saddle height is dependent on hamstring flexibility, that is Dynamic flexibility, which is not as easy to measure as static. If you look at the website there is more detail on this. To also answer you second comment, this video is not intended to be a precise defintion of body position on a bike. It is intended to help people get close enough to a good position to allow fine tuning. Many of the old bike fitting rules can put people cm's away from their ideal posture.
1:18 - Saddle height should be dependent on hamstring flexibility, not knee angle. If a cyclist has poor hamstring flexibility and the saddle is set too high, the lumbar and thoracic spine will flex to compensate and place a greater risk for back pain and intervertebral disk herniation.
Also at 2:12, how is he measuring the ankle when the markers aren't placed from the forefoot to the ankle joint? The pointer should sit on body landmarks- the heel to the forefoot, not the heel to the pedal.
That was the most informative and well presented road-bike fitting instructional video out of all of those I've seen on youtube. Thank you very much. There's one that labels the leg angle as 10-20deg (hand-drawn) and not the 147.4deg that you show clearly and correctly.
Frankly the position of those bars is dangerous. Sprint on the drops and your hands will slip off with the bar rotated too far up like that. The forearm will hit the top levering the hand off the down-sloping drop. The hoods will also be uncomfortable as soon as she gets out of the saddle. The basic problem is that she's tried to compensate a bar that is too low by rotating it up. A better solution is to invert the stem and cut the steerer longer to leave the bar about 2cm below the saddle.
Thank you for posting this video, it explains why my knees hurt on hills, and longer rides, also explaining angles and how it effects the rider is very helpful, thanks
Nice vid! What software are you using?
wcmayberry 1 day ago
Sorry Dave7348 but you are wrong, the centre of hip rotation is below the surface of the skin, so this point on the surface will never be stationary. The top of the greater trochanter is generally regarded as a best approximation and the guidelines have been established using observation of this point.
Bikedynamics 2 months ago
The hip "spot" is not on the centre of the hip hinge point. It should be stationary, but isn't - it's going up and down, thus negating all the angle measurements.
dave7348 2 months ago
Agreed. Saddle height is dependent on hamstring flexibility, that is Dynamic flexibility, which is not as easy to measure as static. If you look at the website there is more detail on this. To also answer you second comment, this video is not intended to be a precise defintion of body position on a bike. It is intended to help people get close enough to a good position to allow fine tuning. Many of the old bike fitting rules can put people cm's away from their ideal posture.
Bikedynamics 3 months ago
1:18 - Saddle height should be dependent on hamstring flexibility, not knee angle. If a cyclist has poor hamstring flexibility and the saddle is set too high, the lumbar and thoracic spine will flex to compensate and place a greater risk for back pain and intervertebral disk herniation.
Also at 2:12, how is he measuring the ankle when the markers aren't placed from the forefoot to the ankle joint? The pointer should sit on body landmarks- the heel to the forefoot, not the heel to the pedal.
FormulaDStock 3 months ago
The software used is Dartfish.
Bikedynamics 3 months ago
What software do you use to make the video analysis?
espiritooutdoor 3 months ago
That was the most informative and well presented road-bike fitting instructional video out of all of those I've seen on youtube. Thank you very much. There's one that labels the leg angle as 10-20deg (hand-drawn) and not the 147.4deg that you show clearly and correctly.
jaxford25 3 months ago
what software is this?
marwooj 3 months ago
Very Informative. Great Video.
mrnastok74 3 months ago
use full for immprove my ride
pharishankar 4 months ago
@pharishankar
pharishankar 4 months ago
please put subtitle
nmarie9793 5 months ago
Could have been even briefer, but still very informative with all the visualizations. Thanks.
hymen0callis 5 months ago
well explained, thank you
yangsun1 1 year ago 3
im sure this video is informative, but i got too bored to find out
jamiewhatwhat 1 year ago
Frankly the position of those bars is dangerous. Sprint on the drops and your hands will slip off with the bar rotated too far up like that. The forearm will hit the top levering the hand off the down-sloping drop. The hoods will also be uncomfortable as soon as she gets out of the saddle. The basic problem is that she's tried to compensate a bar that is too low by rotating it up. A better solution is to invert the stem and cut the steerer longer to leave the bar about 2cm below the saddle.
JohnGourette 1 year ago
Thank you for posting this video, it explains why my knees hurt on hills, and longer rides, also explaining angles and how it effects the rider is very helpful, thanks
TheWolfboy0000 1 year ago
Very helpful, thank you.
mightyPants 1 year ago
Love the video thanks for posting this. Really good info.
ggg63bhp 1 year ago
This is a very good insight into some of the science - in theory and in practice - of specialist bike fitting. Good stuff
cyclaire1 2 years ago