What type of bottom bracket is this?

domelis
domelis Posts: 9
edited February 2016 in Workshop
I'm preparing my bike for 4000k trip from UK to Morocco and would like to swap my compact chainset to triple mountain but I'm getting confused on all these bottom bracket types. Can anyone tell what kind of bottom bracket is this?

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Comments

  • scottishgeek
    scottishgeek Posts: 143
    Looks like the BB86 pressfit bottom bracket that Fuji use on a number of their frames.
  • domelis
    domelis Posts: 9
    So what do I need to look for when choosing a chainset?
  • peterbob
    peterbob Posts: 46
    domelis wrote:
    So what do I need to look for when choosing a chainset?
    a shimano hollowtech chainset such as a 105 triple say goes straight in. bb86 is how the bracket is fixed to the frame enables the bottom bracket shell to be wider for increased frame building options. the bb shell should be 86mm wide if
    you measure it. The actual chainset fitting to it is the same as any standard hollowtech external thread in cup type.
  • domelis
    domelis Posts: 9
    peterbob wrote:
    domelis wrote:
    So what do I need to look for when choosing a chainset?
    a shimano hollowtech chainset such as a 105 triple say goes straight in. bb86 is how the bracket is fixed to the frame enables the bottom bracket shell to be wider for increased frame building options. the bb shell should be 86mm wide if
    you measure it. The actual chainset fitting to it is the same as any standard hollowtech external thread in cup type.

    Woud square taper chainset like this one http://www.ebay.co.uk/itm/Shimano-FC-M371-Acera-9-Speed-MTB-Triple-Chainset-170mm-/401063133883?hash=item5d6139c2bb:g:4WgAAOSwvUlWq1-O would fit my existing bottom bracket?
  • jimothy78
    jimothy78 Posts: 1,407
    no - you need a Hollowtech II type chainset - with a 24mm hollow spindle attached to the driveside crank arm.
  • arlowood
    arlowood Posts: 2,561
    Something like this
    https://www.evanscycles.com/shimano-460 ... t-EV149648

    Don't forget you'll need to factor in a new triple LH shifter as well as a new triple front mech. Possible also that you'll nee a new med or long cage rear mech and a longer chain.
  • domelis
    domelis Posts: 9
    Thanks everyone for your answers! I came across to this chainset http://www.chainreactioncycles.com/shimano-alivio-m4050-9-speed-triple-chainset/rp-prod119948 Can someone confirm this is going to be compatible? If yes, would this front mech http://www.chainreactioncycles.com/shimano-sora-3503-triple-9sp-front-mech/rp-prod83479 work with this chainset? I have Shimano Sora shifter which I believe is triple compatible as it goes through 3 clicks...
  • patrickf
    patrickf Posts: 536
    Have you considered changing your cassette to give you a larger sprocket? If you go with a long cage (SGS?) type you should be able to get a 32 tooth on the back.

    Conversion to triple would require: new shifter, front derailleur, chainset, chain.
    Other option would require new rear derailleur, cassette, chain.

    34 front & 32 rear gives you a gear ratio of 1.06
    30 front & 28 rear gives you a gear ratio of 1.07 (the lower, the easier)
  • patrickf
    patrickf Posts: 536
    domelis wrote:
    Thanks everyone for your answers! I came across to this chainset http://www.chainreactioncycles.com/shimano-alivio-m4050-9-speed-triple-chainset/rp-prod119948 Can someone confirm this is going to be compatible? If yes, would this front mech http://www.chainreactioncycles.com/shimano-sora-3503-triple-9sp-front-mech/rp-prod83479 work with this chainset? I have Shimano Sora shifter which I believe is triple compatible as it goes through 3 clicks...
    Do you know the model number? That third click you refer to will be the trim function.

    If it is a triple shifter on a double system it should be limited to two clicks, so you won't hear that third click - if that makes sense.
  • domelis
    domelis Posts: 9
    patrickf wrote:
    Have you considered changing your cassette to give you a larger sprocket? If you go with a long cage (SGS?) type you should be able to get a 32 tooth on the back.

    Conversion to triple would require: new shifter, front derailleur, chainset, chain.
    Other option would require new rear derailleur, cassette, chain.

    34 front & 32 rear gives you a gear ratio of 1.06
    30 front & 28 rear gives you a gear ratio of 1.07 (the lower, the easier)

    I already have 11-32 at the back and 50-34 in front and I don't think that's going to be enough with fully loaded 4 panniers so that's why I'm looking for easier gears. I also had a look at dedicated touring bikes and all of them have triple in front
  • domelis
    domelis Posts: 9
    Do you know the model number? That third click you refer to will be the trim function.

    If it is a triple shifter on a double system it should be limited to two clicks, so you won't hear that third click - if that makes sense.

    Just had a closer look on my shifter and unfortunately it's says double :( Just wondering what would the cheapest option to add easier gears..
  • arlowood
    arlowood Posts: 2,561
    IIRC 9 speed shimano road and mtb rear mechs are cross compatible so you could source a mtb rear mech and something like a 9 speed mtb 12-36 casstte
    http://www.bike-discount.de/en/buy/shim ... -36-209435

    and run that with your 9 speed Sora road shifters and the compact chainset. That would give you a bit more lower end gearing. I think there are also mtb cassettes thar run to a 40t lowest cog but not sure they're available in 9 speed.

    Im sure more knowledgeable heads will chip in to confirm or otherwise.
  • peterbob
    peterbob Posts: 46
    actually the left crank bolt looks like sram/truvative fitting. take it out and post a picture of the crank spindle and we can say for sure. left bearing has a smaller internal diameter than the right.

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