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  1. #1
    Join Date
    May 2004

    Bolt size for a square tapper BB?

    What is the bolt size for a square tapper BB. I have a spin bike at home that me and my wife bought that is missing the bolt. My bike store doent have in stock right now and so I am going to the hardwear store to get a bolt and washer for a temp. fix.


  2. #2
    mtbr member
    Join Date
    Mar 2004

    M8 X 1.0mm

    On Shimano, I believe it is fine thread M8. Most of the hardware stores will probably carry the most common M8 X 1.25 coarse.

    You can get a pair for $3 online.

    Good luck,

  3. #3
    Old man on a bike
    Reputation: Bikinfoolferlife's Avatar
    Join Date
    Feb 2004

    I gotta bunch of extras in my parts box,

    but if you go the hardware store route make sure they have a flange behind the bolt head to properly push the crank arm onto the spindle, or use an appropriate washer; BTW the bolt heads are predominantly 14mm these days...
    "...the people get the government they deserve..."
    suum quique

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