Aug 29, 2001 2:00 PM
|A few weeks ago I passed a funky tandem on the path. It had unidirectional pedaling on it. Does that make sense? Both crank arms face the same direction. While the captains feet are at 6 o'clock, the stokers feet are at 12 o'clock.
This was very interesting. I'm not sure I could clip out on this bike.
|Out of phase cranks...||mrcelloboy|
Aug 29, 2001 2:14 PM
|it's one of the interesting techniques tandem teams try to be different. The idea is that one rider is always in the "power" phase of their pedal stroke. It's not real popular with teams that climb out of the saddle. Picture that!
I'm about to try setting our cranks at 1 or 2 teeth out of phase to see how that works. Kathy is a masher and i'm a spinner, so it might actually help our power output. I'll keep y'all posted. There are also two different independent drive systems for tandems that allow one rider to coast while the other pedals. Say WHAT!
|Out of phase cranks... (Revisted)||Kristin|
Oct 29, 2001 7:53 AM
|After a conversation at the Hilly Hundred, I realized we may have been talking about two different things here. I thought I'd take another stab at discribing this, since it was quite unique, and no one I've spoken to yet, has heard of a tandem like this.
If I understand out of phase cranks correctly, it would mean that the captains right leg is at 6 o'clock while the stokers right leg might be at, say, 2 o'clock. But each riders cranks are still positioned opposite each other.
Picture this. BOTH of the captains feet are at 6 o'clock at the same time. While BOTH of the stoker's feet are at the 12 o'clock position AT THE SAME TIME. (i.e. to accomplish this on my road bike, I'd rotate just ONE crank by 180 degrees.) This tandem looked like something you'd see in a circus.
|re: timing and drive chains on same side too?||JohnnA|
Aug 29, 2001 2:35 PM
|I understand the out of phase part, but did I also read that the timing chain and drive chain were on the right? There's one like that in the LBS. Visually it just looks odd, and it kills the granny chain ring.|
|re: timing and drive chains on same side too?||mrcelloboy|
Aug 29, 2001 3:10 PM
|There are tandems set up like that as well as double timing chain setups (both sides). The advantage of same side is in not needing as many special cranksets and rings, and you only get one leg greasy.
Double chains spread the load to more places.