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  1. #1
    Join Date
    Jan 2012
    Location
    Ohio
    Posts
    105

    Upgrades to Fuji touring series IV

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    I'm try to help out an aging cyclist with upgrades to help with knee issues. One difficulty is with climbing the gearing on the Fuji touring series IV isn't low enough. I thought that switching out the front triple from 50-48-28 to a modern hybrid or MTB crank might help and keep costs low. I found two options Sunlite triple 48-36-26 and a shimano M-361
    with 42-32-22. I know that the BB will have to be changed out. Is there any compatibility issues that I need to worry about if I'm running this with 6-speed cassette? Also the bike currently runs a 172.5 would a shorter crank be helpful for knee issues?
    _________
    1996 Kona Kula-14
    2011 Surly LHT-46

  2. #2
    Join Date
    Feb 2016
    Posts
    17
    I’m assuming you meant that the current chainrings are 50-38-28 …right? If that is correct, then the effect of changing to the 48-36-26 would be pretty minor. The change to 42-32-22 should be very noticeable, especially with the smallest ring.

    The only problem with the change to 42-32-22 is that your front derailleur might not cope well with the smaller rings. (The curvatures of the derailleur cage plates are designed work for a specific range of chainrings.) You’d have to try it out and see.

    A shorter crank would decrease the range of motion for the knees. It would also make it easier to spin at a higher cadence.
    2011 Specialized Ruby Elite - my "go fast, go long" road bike
    1997 DiamondBack Expert - old road bike currently serving duty as a gravel bike
    1989 Klein Pinnacle - classic unsuspended mountain bike

  3. #3
    Join Date
    Jan 2012
    Location
    Ohio
    Posts
    105
    Nope his chain rings really are 50-48-28. It's really difficult for him to make that jump to the smallest chainring when he has run out of low gears on the 48t ring.

    I'm going to talk to him about the shorter crank arms and see if he thinks it would help. If we are Changing out the crank anyway and it would keep him able to ride longer we may as well make the switch to shorter crank arms ms at the same time.
    _________
    1996 Kona Kula-14
    2011 Surly LHT-46

  4. #4
    Join Date
    Jan 2012
    Location
    Ohio
    Posts
    105
    A decision has been made and I hope it works. Turns out the chain rings are 50-45-28. Still top end is too big for him. We've decided to switch out the 45 for the 50 and add a 34 for the middle. We are leaving the 28 for now but I expect to swap it out for a 26 or smaller soon. I'm going to lower the front derailleur so it is at the correct height for the 45 tooth ring. I'll let you know how it goes.
    _________
    1996 Kona Kula-14
    2011 Surly LHT-46

  5. #5
    Join Date
    Jun 2010
    Posts
    6,415
    Shorter cranks are supposed to be easier on the knees, but I think that a person with long femurs wouldn't find that better. Cranks should fit.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

 

 

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