What size BB is this?!

cojones
cojones Posts: 131
edited April 2011 in Road beginners
Hi All,

I'm replacing my BB on my Fuji Roubaix 3.0 2010. I need a Shimano BB-ES51 for my replacement chainset but they come in different sizes. I know I have 68 English BB shell thread, but I've got no way of telling what axle size I need. Wiggle says there are 113,118, 121 but I've got no way of knowing which I need from the BB I've removed. I've put a photo of the removed BB details at http://dl.dropbox.com/u/901827/photo.JPG

None of the numbers on the removed BB match what I can get on the new BB! Can anyone suggest what size axle I need to buy please?

Am I being thick? (that is rhetorical btw)!

Thanks,

Coj
http://www.tuneyourdi2.com

Comments

  • topdude
    topdude Posts: 1,557
    Am I being thick? (that is rhetorical btw)!

    Yep, yr being thick all right :D

    label says 110.5 and you could just measure the axle length anyway :shock:
    He is not the messiah, he is a very naughty boy !!
  • cojones
    cojones Posts: 131
    hmm...thanks topdude!

    I thought the 110.5 was the axle length. The reason for asking was that the new BB only has 113, 118 and 121...not 110.5. My LBS said measure the old BB and make sure I get the same size replacement. Hence my confusion. I think the 113 is nearest so I'll go for that one, would that work?
    http://www.tuneyourdi2.com
  • nicklouse
    nicklouse Posts: 50,673
    get a 110

    http://www.chainreactioncycles.com/Mode ... elID=17473

    presuming it is a square taper.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cojones
    cojones Posts: 131
    it's not a square taper, it's an octalink. Surely if it fits the BB shell and the new chainset that's all I need to worry about, am I missing something?
    http://www.tuneyourdi2.com
  • nicklouse
    nicklouse Posts: 50,673
    it needs to be the same length or your chain line will be off and you may have shifting issues or your mech may not move far enough.

    VP dont make octalink BBs IIRC.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • cojones
    cojones Posts: 131
    aaah, yes, that makes sense. Thanks. Now to find an octalink BB as short as 110 (although I'm thinking that the 113 should be ok...hopefully I can cope with a 2.5mm difference)!
    http://www.tuneyourdi2.com
  • nicklouse
    nicklouse Posts: 50,673
    cojones wrote:
    aaah, yes, that makes sense. Thanks. Now to find an octalink BB as short as 110 (although I'm thinking that the 113 should be ok...hopefully I can cope with a 2.5mm difference)!

    why?

    you need a bb of the correct length for you new cranks.

    the fact you had a 110 in it before means nothing.

    what are the "new" cranks? Part number please.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • rickwiggans
    rickwiggans Posts: 416
    If you've discussed it with your LBS, why not buy from them?
    ______________________

    http://garstangcyclingclub.net

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