http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: "Is the end for derailleurs in sight?" en Wed, 15 Apr 2026 10:34:27 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=701#post-6030 Thu, 22 Apr 2010 16:56:10 +0000 cb 6030@http://citycyclingedinburgh.info/bbpress/ <p>I remember when in Canada a few years back watching, with some fascination, a feature on a shopping channel for the latest inovation in bicycle gearing. This was the automatic derailleur (pretty sure that the word 'derailleur' wasn't used, but that's what it was).</p> <p>This was a revolutionary new concept, let me tell you, and everyone who tried it, from novice cyclists to hardened pros were immediate converts. Of course being on a shopping channel the three minutes of actual information was spun out to at least 30mins. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=701#post-6027 Thu, 22 Apr 2010 15:40:27 +0000 Arellcat 6027@http://citycyclingedinburgh.info/bbpress/ <p>That's a pretty wild range they're talking about. 1:0 at one end for gearing down to a standstill, to 1:6 at the top end. An apparently 600%+ range, or a millionbillion% range if you divide by zero?</p> <p>The Fallbrook NuVinci hub has been out in the real world for a few years now, and "compares favorably with the internally geared hubs on the market today and has the same or better ratio range." 2.4kg of hub is a fair chunk, and a 350% range isn't quite up to Rohloff standards, but it's still the benchmark it would seem for bicycle CVTs. And since it -- and on the face of it, the DuPont hub -- still rely on a chain from BB to rear wheel, neither is going to quite match the ~98% efficiency of a pure chain drive. But for urban activity, that might become less of an issue.</p> <p>How come I've never heard of PowerCordz? Their plastic (i.e., fossil fuel made) derailleur and brake cables look very interesting from a durability point of view, to say nothing of the undoubted attraction to the gram counters over on WeightWeenies! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=701#post-6018 Thu, 22 Apr 2010 14:34:33 +0000 chdot 6018@http://citycyclingedinburgh.info/bbpress/ <p><a href="http://www.bikebiz.com/news/32057/Could-this-be-the-end-of-derailleurs" rel="nofollow">http://www.bikebiz.com/news/32057/Could-this-be-the-end-of-derailleurs</a> </p>