Quote:
Originally Posted by cachagua
We've covered that already:
I think I see what you're driving at -- that when the frame releases the strain energy that one pedal stroke put into it, that could move the other pedal a little farther around, or make it easier for it to rotate. It's a beautiful idea! It would be great if it were true! But as we see, what retards one pedal retards the other equally.
|
It has nothing to do with the pedals or advancing them. It is that the stays get shorter from twisting when the BB sways, and when the sway goes through the center point the distance between chainring and cassette gets longer. When that happens either the crank is going to stop your legs or the chain will pull the wheel. Since we know your legs don't hiccup at the bottom of the pedal stroke, the elongation goes toward moving the bike.
Again, this isn't because chain tension has relaxed, it is because the lateral displacement of the BB has relaxed into a position that requires more chain. And even if the frame didn't want to relax to that position, the other half of your pedal stroke doesn't give it any choice.
Right pedal, neutral, left pedal, neutral.
Short stays, long stays, short stays, long stays.
Less chain, more chain, less chain, more chain.