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what muscles are used more when the seat is set back.....(8 posts)

what muscles are used more when the seat is set back.....Gall
Oct 26, 2002 5:17 AM
Hello again,

I was reading several web sites about set up for different bikes with 74, 76 and 78 deg seat tubes.

some sites advise that the further back you are on the seat tube you use you quads more then your hamstrings. then some places it states that the further back you are you use your hamstrings more then your quads.

i am a bit confused. whats the real truth?

I'm pretty sure it would be quads. (nm)up_hiller
Oct 26, 2002 6:02 AM
re: what muscles are used more when the seat is set back.....Nessism
Oct 26, 2002 6:22 AM
From my personel experience when I use a rearward seat position it brings the hamstrings and gluts more into the equation. The key is to use a position that allows you to spin the cranks in a round circle. I think this is how the most power is generated. Also, learning to spin circles is easier on the knees and joints.

Good luck.

re: what muscles are used more when the seat is set back.....merckx56
Oct 26, 2002 6:27 AM
I'm trying a little bit different position on my 'cross bike that includes more setback. The only real difference that I've noticed is in the hip flexor muscles. I don't feel tht it makes anymore or less power though. I also feel like I'm not able to open my hips as much on the downward stroke.
re: what muscles are used more when the seat is set back.....Jon Billheimer
Oct 26, 2002 7:07 AM
I think part of the confusion is because the hamstrings extend the leg at the hip, but they also flex the leg at the knee. Also, moving the saddle back or forward will affect the timing of the activation of the quads and hip flexors, to a point. So the activation of both hamstrings and hip flexors will be timed slightly differently in the pedal stroke depending on setback. Setting the saddle back somewhat will activate the hamstrings and glutes more in the top of the pedal stroke as the leg pushes the pedal over the top. However, a more forward seat position will add power to the downstroke from about 4 o'clock to 6 o'clock. That power, however, is coming from both the quadriceps as they extend the leg at the knee and the hamstrings and glutes as they extend the leg at the hip. I think some individual preference is due to each individual's morphology and relative muscle balance.
I like this diagramTig
Oct 26, 2002 10:51 AM
I forgot who originally posted it though.
Tig (et. al.), excellent pic. (nm)rtyszko
Oct 26, 2002 3:26 PM
Oct 26, 2002 6:14 PM
the mucscles in your legs.