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Specialized Tarmac BB/Groupset

  • This topic has 5 replies, 6 voices, and was last updated 9 years ago by DirkS.
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  • June 27, 2017 at 3:09 pm #894099
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    DirkS

    Hi, I’ve just done this on an

    Hi, I’ve just done this on an sl4. I went with the praxis works osbb to shimano adapter. I think it’s the best option. Easy job. The are video on YouTube.

    May 31, 2017 at 11:56 am #894097
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    TypeVertigo

    From what I can tell, Spez

    From what I can tell, Spez OSBB comes in two flavors, largely dependent on your frame material.

    Aluminum frames are marked “OSBB” but are BB30 in reality – the metal bearings go in and are secured with circlips.

    http://wheelsmfg.com/specialized-alloy-osbb-tech

    Carbon frames are still marked “OSBB” but are a modified version of PF30. The bearings sit inside plastic cups, whose outer lips stop them from sinking too far inside the BB shell – hence no need for circlips. It does need some spacers in addition to the PF30 cups though.

    http://wheelsmfg.com/carbon-osbb-tech

    Both BB30 and PF30 (and by extension, all flavors of Spez OSBB) are built around cranks with 30 mm spindle diamters. All Shimano cranks have 24 mm spindles, so a reducer adapter is needed.

    May 30, 2017 at 8:03 pm #894095
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    Rapha Nadal

    It’s not a pain in the arse

    It’s not a pain in the arse to replace though? I wore out the BB in my SL4 and replaced it with a C-Bear ceramic unit. Piece of piss to source & replace.

    The fitted BB is designed for 30mm axles and Shimano don’t make them – hence the need for adaptors to reduce the size of the BB.

    It’s not hard.

     

    Take a look, there’s even an OSBB section for you – https://www.c-bear.com/en/osbb

    May 30, 2017 at 7:04 pm #894093
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    dottigirl

    Wow, they’re using the same

    Wow, they’re using the same trick as for their proprietary Mindset headset?  Ignore any industry standard and install something which is a PITA to replace, with associated further expense.

    Utter penny-grabbing bastards.

     

     

     

    May 30, 2017 at 5:54 pm #894091
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    VeloUSA

    In order to use a crankset

    In order to use a crankset other than Specialized you need to purchase a set of adpater cups (plus shims) such as these by Wheels Manufacturing. Why? Specialized has an OSBB (over sized bb) larger than Shimano/Sram/Campy. Thus the need for cups.

    BB/PF30 Universal Adapter for 24mm Spindle Cranks (Shimano, FSA, etc.)

    For a complete conversion (entire BB) see Praxis Works

    https://www.praxiscycles.com/product/shimano-conversion-bb/

     

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