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  1. #1
    Senior Member tmh657's Avatar
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    Which crank to go 175mm?

    I have a 20 year old Suntour drive train and it's a 170mm. It works fine but after riding my other bike with 175mm I know that I prefer that length.

    Any ideas on what to replace it with that isn't so new it won't work?
    It has a Suntour BB but I don't know what kind of taper it has.

    Also the existing crank has 42/53 rings so I am guessing a replacement would have 39/52 rings. Will I need a new FD to handle that?
    Hmmm, and how would 39/52 work with my existing 7 speed freewheel as far as ratios? Maybe I could find a 175mm crank and put my existing rings on it...

  2. #2
    no one cares -holiday76's Avatar
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    i'd think most any square taper double crank in 175 will bolt right up. I'd also expect that the same front derailleur that shifts between 53-42 will also shift between 52/39. That's not much of a difference. Heck, Ive used derailleur's meant for doubles to shift triples, so I'm sure what you'd like to do is fine.
    Last edited by -holiday76; 03-01-09 at 09:39 PM.
    I prefer emails to private messages - holiday76@gmail.com
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  3. #3
    slow as I ever was Ex Pres's Avatar
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    Post a swap of your 170mm Suntour for a like 175mm in the ISO/WTB thread. You never know.
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  4. #4
    Senior Member Deanster04's Avatar
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    Siguno makes square taper cranks. Try the Quality Catalog at your LBS. They aren't expensive.

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