Front Planetary Gearbox vs Derailer- Mtbr.com
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  1. #1
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    Front Planetary Gearbox vs Derailer

    Is this a new idea? Just happened to come across it somehow today.

    https://www.indiegogo.com/projects/3...-gearbox-efneo

    I think it's a cool idea and has all sorts of commuting applications. For example I'd love a 3 speed commuter with no derailers! Of course I assume a IGH could accomplish something like that. But is this lower maintenance? Nice to be able to downshift at a stop too.

    Could you also use this to effectively convert a 10 speed to 15 speed, 12 speed to 18 speed, etc? Maybe that wouldn't make much sense based on the ratios of gears on the rear cassette though.
    Last edited by cobi; 02-24-2015 at 01:21 PM.

  2. #2
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    That's pretty cool.

    Truvativ does have their HammerSchmidt crankset that's got a transmission and a high/low gear. But it's way pricier than this one.

    Death to the front derailleur.

  3. #3
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    Quote Originally Posted by newfangled View Post
    That's pretty cool.

    Truvativ does have their HammerSchmidt crankset that's got a transmission and a high/low gear. But it's way pricier than this one.

    Death to the front derailleur.
    There is another.

    Patterson Bike - Rocket Fast Shifting | Cannot Throw a Chain

    Also a 2 speed. By gearing, they appear to be suited to Mountain bikes?

    I haven't figured out why after being set perfectly at home I can still throw my chain off the shift to the big ring. Sometimes I can get it back to the middle for another try and sometimes, I can't. This would be nice. The Sugino triple could go to the errand bike, then. A hill, headwind and 70 pounds of groceries need a lower gear.

  4. #4
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    Also Schlumpf.

    The big issue to me (from a performance/longevity perspective) specifically for the Patterson is that the bike really needs to be built to withstand those forces acting on the chainstays, which are pretty damn thin on many performance bikes. The Hammerschmidt gets around that by using ISCG tabs. Information on how the Efneo actually mounts is pretty sparse, and that worries me. Planetary assemblies can put a phenomenal amount of force into their mounting surfaces--look at what happens to the dropouts/forkends when someone doesn't tighten the bolts enough! The same thing happens with coaster and drum brakes, for that matter, though I suppose one could make that case for any loose load bearing part.

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