The claim that "clipless means less fatigue" is a new one to me, and (again) I haven't seen an iota of evidence to back it up.
I haven't seen any. I'd also guess that almost everyone who views such tiny amounts as significant will use foot retention regardless.Is there a graph showing power output on platforms?
The thing is, I don't think you can make a proper evaluation using subjective methods. AFAIK the pedal-based power meters will all use clipless. IIRC one power meter (Quarq?) offers left-right, but that's an estimate rather than a direct measurement.I find when I am on platforms that I never fully unload the upstroke pedal, and my feet start hurting a lot quicker.
FWIW, when I am riding hard instead of just riding around with the wife I would rather be wearing clipless pedals, especially up and down hills.
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Last edited by cooker; 07-03-13 at 04:10 PM.
The only way you're getting me out of my clipless road pedals is if you pry them off my cold dead feet!
How anyone can argue about the effectiveness of clipless pedals after that, I don't know.
Dream. Dare. Do.
What I know is that it's startling to wander down to campus and hear all the kids on their platform pedals sounding Zippppp Zippppp Zipppppp Zippppppp... in individual strokes instead of the steady whirrrr of roadies.
One muscle's proficiency dosen't have anything to do with the others. Joule for joule, the power comes from direction, not timing. If you can spread say 40 watts over two strokes, even if it's 30-10, then you can optimize (minimize) the wear on said strokes.
Yeah, everyone has a better push down than anything else (thus the elliptical cranksets), but that's no reason not to use everything else too. if you push down with 40 watts but you can also pull with 15, why not take the 55? (totally making these number up, as I'm sure you noticed) it's [almost] the same energy transfer, but more power.
Last edited by cooker; 07-03-13 at 09:27 PM.
Oh, goodie.I may be newer to bikes, but I am incredibly well based in thermodynamics.
Would you care to calculate how much force is required to lift your leg? Or do you imagine that lifting 10% of your body's mass requires no energy whatsoever?
1) Because that energy/force is actually going into lifting your leg.if you push down with 40 watts but you can also pull with 15, why not take the 55?
2) Because your leg was not designed to exert significant forces when lifting.
3) Because, presumably due to the above factors, pulling up actually reduces your total efficiency.
Another source, by the way, is Andy Pruitt, one of the top cycling sports docs, who heads up the Boulder Center for Sports Medicine, does fittings for numerous pro teams:
"Because of advancing technology and the development of new ways to observe and measure biomechanics in action, we know a great deal about the pedal stroke. And one of the things we know is that even the best pedaling stylists don’t produce power when they pull up on the backstroke. The most they can hope for is to unweight the rear foot so it adds less drag to the power output of the foot that is pushing downward. But it’s not possible even to get the back foot out of the way entirely."
With all due respect, I'm gonna go with the top sports doc, who has been working regularly with top pros in numerous disciplines (including road, mountain & track) and has been using pedal-based power meters for over a decade.