COPIED:
Dear readers;
I get a lot of questions about cranks - crank lengths, non-standard cranks, compatibility, etc., so I thought I'd just combine a number of them here. --Lennard
Dear Lennard;
I would like to read your comments or opinions on a product called PowerCranks (see at Powercranks.com). I would like to buy a pair to improve my technique. Thanks for your help. --Helton
Dear Helton;
PowerCranks are cranks with a clutch bearing at the bottom-bracket connection in order to only engage the bottom bracket in the forward direction. You can only keep them turning if you pull up and around the entire stroke, since they spin freely backward. You can find articles about PowerCranks in back issues of VeloNews, namely May 31, 1999 and July 12, 1999, as well as Inside Triathlon in February 2002 and July 1999.
I rode many months and many miles on PowerCranks. I certainly believe that they improve one's technique and strength on the backstroke, since they will not come back up if you don't pull ‘em up. That said, I am not sure that they do not also encourage you to soft-pedal the downstroke to avoid having to pull up as hard and fast. I think that if you are getting PowerCranks that you need two bikes, one with standard cranks and the other with PowerCranks. Do at least some power workouts on the standard cranks to not lose quad power, and, of course, race on the standard cranks, since those heavy, hard-to-pedal PowerCranks are much slower. --Lennard
http://www.velonews.com/...articles/3376.0.html
Dear readers;
I get a lot of questions about cranks - crank lengths, non-standard cranks, compatibility, etc., so I thought I'd just combine a number of them here. --Lennard
Dear Lennard;
I would like to read your comments or opinions on a product called PowerCranks (see at Powercranks.com). I would like to buy a pair to improve my technique. Thanks for your help. --Helton
Dear Helton;
PowerCranks are cranks with a clutch bearing at the bottom-bracket connection in order to only engage the bottom bracket in the forward direction. You can only keep them turning if you pull up and around the entire stroke, since they spin freely backward. You can find articles about PowerCranks in back issues of VeloNews, namely May 31, 1999 and July 12, 1999, as well as Inside Triathlon in February 2002 and July 1999.
I rode many months and many miles on PowerCranks. I certainly believe that they improve one's technique and strength on the backstroke, since they will not come back up if you don't pull ‘em up. That said, I am not sure that they do not also encourage you to soft-pedal the downstroke to avoid having to pull up as hard and fast. I think that if you are getting PowerCranks that you need two bikes, one with standard cranks and the other with PowerCranks. Do at least some power workouts on the standard cranks to not lose quad power, and, of course, race on the standard cranks, since those heavy, hard-to-pedal PowerCranks are much slower. --Lennard
http://www.velonews.com/...articles/3376.0.html