Road Bike with Alfine IGH

The Dynamic Synergy is being touted as the world’s first production road bike that comes outfitted with an internal gear hub. No doubt, IGHs are still not as efficient as derailleur systems, and they come with a weight penalty as well, but this is an indication that they’re getting lighter and more efficient. I suspect we’ll see more of this in the future as IGH technology continues to evolve.

Dynamic Synergy

10 Responses to “Road Bike with Alfine IGH”

  • Fritz says:


    Maybe the first bike sold new that way (thought I doubt that too) but certainly not the world’s first IGH road bike.

    That’s interesting for another reason to me: I thought Dynamic just did shaft drive bikes

  • Paulo Patu says:

    My wife has an Orbea DERIO DAMA with Nexus and alfine, with a flat bar, it´s a nice road bike.
    And I have a Voodoo with a complete alfine kit, with discs, also with flat bar, it rides very well.

  • Duncan Watson says:

    I like IGH bikes myself. I am building up a Raptobike lowracer (recumbent) with a Rohloff right now, well as soon as the frame arrives that is. Simplifying the drive train from the users point of view is a worthy goal.

  • Alan says:

    Hey Duncan,

    Let me know if you end up posting photos of your Rohloff Raptobike on your blog – I’d love to see it.


  • Duncan Watson says:

    I will post them on my blog and on my flickr account so that higher res versions are available.

  • Roland Smith says:

    @Duncan: The raptobike’s front wheel is an elegant solution to the recumbent’s long drivetrain problem. I would seriously consider one for commuting if not for the creature comforts (suspension :-) and luggage rack on my Challenge Hurricane. I do wonder though how a raptobike driver keeps clean? In wet weather I image the chain spewing water and dirt all over you, even with a front fender. Probably the first thing I’d do is make a kind of cover out of carbon/epoxy for the top part of the chain and the guide wheels, as to keep clean and not get my trousers chewed up.

    Having said that, a raptobike with a Rohloff sounds like a capital idea. What kind of chain will you be using with it? I was very impressed with Rohloff’s own s-l-t 99 fitted to my Hurricane. Not a speck of rust on it during the whole winter of driving over salted roads (but then I clean and lubricate the chain every month or so).

    @Alan: I think people are making too much out of the efficiency difference between derailer and IGH drive. Sure, there is a couple of percent difference under laboratory conditions. But in practice I think that the state of wear and maintenance of the driveline and especially the pressure in the tyres will have significantly more influence. In commuterland I see a lot of bikes on a what could charitably be described as “minimal” maintenance scheme. I think an IGH with completely enclosed chain will fare a lot better in those circumstances than a derailer drive!

  • Duncan Watson says:

    I ordered a frame kit, the full list of my build is here ( ). The chain I am planning on using is the SRAM PC-951 chain.

  • Roland Smith says:


    I’ve heard that stelvios are somewhat leak-prone. Marathons are supposed to be better in that regard, and if you inflate them properly (5 bar) the ride is quite nice. I’ve had pices of glass stuck in the rubber of my marathons, but nothing has pierced the kevlar layer yet.

    That tailbox in the picture looks super nice, A very clean fit. It also hides the mismatched wheels pretty well. (I prefer two same size wheels) If you fitted a 20″ rear wheel as well, you could use a substantially bigger tailbox though. BTW, the picture of that anodized raptobike on your blog looks very nice as well.

    I wonder how a raptobike would look with two 24″ rims like the ones Challenge is using? A longer front fork would be necessary, though.

    How will you tension the chain? I’ll be following the build on your blog.

  • 2whls3spds says:

    I think the efficiency/weight fallacy is way overblown. It may be true if you are an ultra competitive rider; for the average rider you lose much more by the clothes you wear and the riding position.

    To me the minimal maintenance and simplicity to operate usually outweighs the negligible differences in weight and efficiency.


  • Duncan Watson says:

    I can swap to Marathons pretty easily if I don’t like the Stelvios. I can’t wait for my frame to arrive so I can start the build.

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