103mm Square Taper Bottom Bracket

GRE1971
GRE1971 Posts: 4
edited May 2014 in Road buying advice
Hi all,

does anyone know if Shimano do a 103mm sqr taper BB? I suspect the answer is no. So the follow up for question is, would a UN55 107mm work on a 2x10 speed set-up? I'm guessing the chain line would be 2mm offset (107-103/2). There's no issue in adjusting the FD to compensate, it's just whether the chain line would cause issues with RD changes . I never cross-over on my gears, if that helps.

I'm keen to get a shimano UN55 BB as the bike is used primarily for commuting and gets the worst of the weather. Consequently i'm on my 3rd BB (FSA) after 10500km. I've been running a UN54 on my mountain bike for 4-5 years now with no issues.

Guy

Comments

  • napoleond
    napoleond Posts: 5,992
    Get a Stronglight one from Spa Cycles
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  • darkhairedlord
    darkhairedlord Posts: 7,180
    I got a token bb after two fsa bb 's gave up. Very good bearings and I believe the cartridges can be swapped out when they do eventually give up. It's a 103mm with carbon body from planet x
  • cycleclinic
    cycleclinic Posts: 6,865
    Tange Seiki LN 7922 in a hollow axle BB 240g in 103mm length
    Tange Seiki LN 3922 is solid axle axle BB 300g in 103mm lengh

    That is what I would use. Token BB's are not bad either.
    http://www.thecycleclinic.co.uk -wheel building and other stuff.
  • bill57
    bill57 Posts: 454
    Shimano used to do a 103mm square taper, but the only chainset that used it was the 8 speed Dura Ace (the really pretty one). 105 and Ultegra of the same period used 107mm. You see the occasional 103 on Ebay but they're pretty rare now.
  • fleshtuxedo
    fleshtuxedo Posts: 1,857
    PX were doing FSA 103mm for £9.99, sold out now but you could ask if more coming
  • darkhairedlord
    darkhairedlord Posts: 7,180
    As OP stated FSA ones wear out too quick.
    The Stronglight JP400 in 103mm is 9.99 or the Token in 103mm is 19.99.
    I have the token in 1033mm and I haven't had a squeak from it and so far lasted longer than both the FSA bb's put together.

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