T-Bob Posted June 20, 2013 Posted June 20, 2013 Friction Facts: Bigger pulleys really are more efficient Among the pulleys tested were 13-tooth Shimano Dura-Ace 7700 (left), Berner's 13/15-tooth set (middle), and a pair of 15-tooth ones from RALTech (right). Small power-saving differences detected between rear derailleur pulley wheels This article originally published on BikeRadar Pro road racers who use Berner's uniquely oversized rear derailleur cages have sworn time and again that they reduce drivetrain friction thanks to their humongous 15-tooth pulleys. Now, Jason Smith of Boulder-based lab Friction Facts has confirmed that claim with his own independent testing. Berner-equipped racers such as Fabian Cancellara, Edvald Boasson Hagen, Philippe Gilbert and others will be relieved to know that the advantage is genuinely there – but it's also pretty small at just 1.76 watts compared to a standard Shimano Dura-Ace setup. Via cycling news http://www.cyclingnews.com/features/friction-facts-bigger-pulleys-really-are-more-efficient nathrix 1
Guest EdEdEd Posted June 19, 2014 Posted June 19, 2014 Friction Facts: Bigger pulleys really are more efficient Among the pulleys tested were 13-tooth Shimano Dura-Ace 7700 (left), Berner's 13/15-tooth set (middle), and a pair of 15-tooth ones from RALTech (right). Small power-saving differences detected between rear derailleur pulley wheels This article originally published on BikeRadar Pro road racers who use Berner's uniquely oversized rear derailleur cages have sworn time and again that they reduce drivetrain friction thanks to their humongous 15-tooth pulleys. Now, Jason Smith of Boulder-based lab Friction Facts has confirmed that claim with his own independent testing. Berner-equipped racers such as Fabian Cancellara, Edvald Boasson Hagen, Philippe Gilbert and others will be relieved to know that the advantage is genuinely there – but it's also pretty small at just 1.76 watts compared to a standard Shimano Dura-Ace setup. Via cycling news http://www.cyclingne...-more-efficient You need a bump?
T-Bob Posted June 19, 2014 Author Posted June 19, 2014 You need a bump? Cheers for the bump, I'd forgot about that bit of 'tech'... Wonder where I can get those big 15 toothers.
Captain Fastbastard Mayhem Posted June 19, 2014 Posted June 19, 2014 Cheers for the bump, I'd forgot about that bit of 'tech'... Wonder where I can get those big 15 toothers.I hear they grow them 15 toothers in Tazzie, mate. T-Bob 1
Guest EdEdEd Posted June 19, 2014 Posted June 19, 2014 I hear they grow them 15 toothers in Tazzie, mate.Tell me about the SPACESHIP!!! ?
T-Bob Posted June 19, 2014 Author Posted June 19, 2014 I hear they grow them 15 toothers in Tazzie, mate. Feck, I've honestly just stopped laughing... Captain Fastbastard Mayhem 1
Captain Fastbastard Mayhem Posted June 19, 2014 Posted June 19, 2014 Feck, I've honestly just stopped laughing...Thought you'd like that....
Captain Fastbastard Mayhem Posted June 19, 2014 Posted June 19, 2014 Tell me about the SPACESHIP!!! ?SPACESHIP!!!! Vangar 1
Brett Posted June 19, 2014 Posted June 19, 2014 Heard that plastic wheels are more efficient than sealed bearing aluminum wheels, like that of kcnc. Anyone know the truth in this?
Captain Fastbastard Mayhem Posted June 19, 2014 Posted June 19, 2014 Now what what!?watch the Lego Movie and you'll understand
Guest EdEdEd Posted June 19, 2014 Posted June 19, 2014 watch the Lego Movie and you'll understand Ooh... Still need to do that!
milky4130 Posted June 19, 2014 Posted June 19, 2014 (edited) 1.76watts is a lot & free (well not exactly free but you'll have the advantage) if I had the means I'll do it too. Edited June 20, 2014 by milky4130
milky4130 Posted June 19, 2014 Posted June 19, 2014 It's like the Right chain & lube I read somewhere also on bike radar some time ago will also give you "free watts" by reducing friction.
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