conversion of a ti legend frame to a three speed

Discussion in 'Road Cycling' started by goodgrey, Jun 17, 2011.

  1. goodgrey

    goodgrey New Member

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    I have a terrific titanium road bike and the components are failing. I live in the hilly northwest. I want to strip it down. I want two climbing gears and a flat speed gear. Any ideas on how to do this?
     
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  2. alfeng

    alfeng Well-Known Member

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    Did you want to use an internally geared hub similar to a Sturmey-Archer 3-speed hub?

    If so, you need to know that the axle length on most hubs of that ilk apparently presumes a 120mm rear dropout spacing ...

    Regardless, what you probably need to know is that the range of the gear ratio is not particularly wide ... well, it is wide enough for some types of riding BUT may not be for what you want.

    So, you would choose the cog size according to the final equivalent that you wanted ... by my reckoning (a long time ago), a 23t cog equals a 29t when in engaged in the lowest of the three gear ratios ... so, the ratio change must be about 30% from the middle gear ... and, a 23t cog would be equivalent to a 16t when the hub is engaged in the highest gear ...

    Calculate the range YOU want, accordingly.

    • a 20t cog will yield a 14t high equivalent & a 26t low equiavlent ...
    • et cetera

    OF COURSE, you will want to choose the chainring according to the low ratio you want to use.
     
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