Hi all
I wanted to put some numbers to the position one has on a Silvio compared to an upright bike.
So...
1. I had my daughter take a picture of me from the side sitting on both my DF road bike and my Silvio, with my leg closet to the camera in the up position, close to my chest.
2. I imported both pictures into Google Sketchup which has some great modeling tools.
3. I measured the angle between my thigh and chest on both bikes.
4. On the DF bike, the angle is 60 degrees
5. On the Silvio it is 90 degrees. 30 degrees more open.
6. We have mentioned many times before on this forum, how when climbing hills, pulling your chest closer to the handle bars increases power.. Seems that closing this angle up allows the leg muscles to contract in a different manner to produce more power.
7. So to produce similar power that an DF does during regular riding, I adjusted the Silvio by readjusting the telescoping steering tube to bring the pedals closer, to close up the angle to the same as on my DF (60 degrees)
8. However, just pulling up the pedals a little, made the the bottom of the front derailer cage, hit the chain so the chain was dragging across it. Seems that when pulling the handle bar tube closer to me, it is pulling the pedals out of the circle that the front chain stay would sweep out, making the cage hit the chain instead.
Have others seen this? Is there any adjustment I am missing? I really think closing this angle up like this would give exactly the same mechanical advantage that the DF frame provides while maintaining the phenomenal Silvio comfort...That same increase in power seen when one draws their chest closer to the handle bars on climbs.
Would love to hear everyone's input!
Thanks
Harold
I wanted to put some numbers to the position one has on a Silvio compared to an upright bike.
So...
1. I had my daughter take a picture of me from the side sitting on both my DF road bike and my Silvio, with my leg closet to the camera in the up position, close to my chest.
2. I imported both pictures into Google Sketchup which has some great modeling tools.
3. I measured the angle between my thigh and chest on both bikes.
4. On the DF bike, the angle is 60 degrees
5. On the Silvio it is 90 degrees. 30 degrees more open.
6. We have mentioned many times before on this forum, how when climbing hills, pulling your chest closer to the handle bars increases power.. Seems that closing this angle up allows the leg muscles to contract in a different manner to produce more power.
7. So to produce similar power that an DF does during regular riding, I adjusted the Silvio by readjusting the telescoping steering tube to bring the pedals closer, to close up the angle to the same as on my DF (60 degrees)
8. However, just pulling up the pedals a little, made the the bottom of the front derailer cage, hit the chain so the chain was dragging across it. Seems that when pulling the handle bar tube closer to me, it is pulling the pedals out of the circle that the front chain stay would sweep out, making the cage hit the chain instead.
Have others seen this? Is there any adjustment I am missing? I really think closing this angle up like this would give exactly the same mechanical advantage that the DF frame provides while maintaining the phenomenal Silvio comfort...That same increase in power seen when one draws their chest closer to the handle bars on climbs.
Would love to hear everyone's input!
Thanks
Harold
