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  • Okay gang, might construct a magic gear single speed MTB with spare parts. What's the easiest calculator to use?

  • I've just had a look at this - http://www.eehouse.org/fixin/formfmu.php

    What are peoples thoughts on magic gear vs chain tensioners? How big a tolerance do you realistically have? Running 42/18 on the Uncle John gives 63 GI, but it is half a mm too long (slack).
    This seems like a negligible amount, and I'd expect to get reasonable chain tension but just wondering what people think. Am I just making life hard for myself trying to avoid buying a chain tensioner?

  • A chain tensioner is a lot simpler to set up and maintain. Any other way of tensioning the chain, like an EBB or magic gear, usually requires regular maintenance to ensure the chain remains engaged.

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