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  1. #1
    Senior Member wildturkey's Avatar
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    BB Question: Non-drive side BB cup not tight against shell - OK?

    I just posted this in the SSFG forum since the bike in question is a fixed gear, but then I realized I should probably be asking some "real" mechanics the question ...
    Anyway, I had a shop replace my cartridge bottom bracket (IRD QB-75 to go with my Sugino RD2 cranks). I realized when I got home that a full thread of the non-drive cup (left side) was showing -- sticking out slightly (2 mm) out of the BB shell. I don't have a crank removal or BB tool to take off the cranks and test if the cup is tight. Is this something I should bother going by the shop to ask about? Or, is it normal for the BB cup to not be totally tightened against the shell (so that a thread shows)? Thanks for the help!

  2. #2
    * vpiuva's Avatar
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    I would assume the shop torqued/tightened it properly and that's the threads they were left with. Should be no issue but if it will make you feel better call the shop and ask the mechanic that installed it. At least that way they are forewarned if it does come loose on you. If it does loosen while you're riding the crank won't fall off, you'll just have to ride home slower

  3. #3
    Senior Member wildturkey's Avatar
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    Good idea... thanks vpiuva

  4. #4
    Senior Member kenshinvt's Avatar
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    also, after you go for a good ride on it, try grabbing both crank arms and push/pull to see if you can rock them back and forth to find any play in it.

  5. #5
    Perineal Pressurized dobber's Avatar
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    The non-drive side cup (assuming we're talking about a cartridge type bb here) has a wedge shape to it and will only go in so far. Forcing it in further will either pinch the bearings or crack the cup.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  6. #6
    You need a new bike supcom's Avatar
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    Quote Originally Posted by wildturkey View Post
    I just posted this in the SSFG forum since the bike in question is a fixed gear, but then I realized I should probably be asking some "real" mechanics the question ...
    Anyway, I had a shop replace my cartridge bottom bracket (IRD QB-75 to go with my Sugino RD2 cranks). I realized when I got home that a full thread of the non-drive cup (left side) was showing -- sticking out slightly (2 mm) out of the BB shell. I don't have a crank removal or BB tool to take off the cranks and test if the cup is tight. Is this something I should bother going by the shop to ask about? Or, is it normal for the BB cup to not be totally tightened against the shell (so that a thread shows)? Thanks for the help!
    Perfectly normal.

  7. #7
    Senior Member wildturkey's Avatar
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    Thanks everyone!

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