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For square-taper aluminum cranks:

When my drive-side crank is in the 12:00/highest position and the non-drive side in the 6:00/lowest position, there is slight play between both cranks (it rotates transversely/outward about 1mm) It's only in this one spot. Is this a bottom bracket going out? Last time my BB went out it was sliding side to side.

I've tried tightening the crank bolts but they are snug.

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  • can you feel this play with the cranks removed from the spindle?
    – Paul H
    Commented Jan 10 at 20:41
  • Is this an open/loose bearing setup? I'd suspect wear in the cups/cones. Maybe worth upgrading to a cartridge-based BB.
    – Criggie ♦
    Commented Jan 10 at 21:41
  • @PaulH I haven't removed the cranks. Currently on tour and don't want to make things worse till I'm near a city. If there is play, what does that indicate?
    – daddyblondlegs
    Commented Jan 11 at 4:38
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    @Criggie I believe it is a cartridge. interlocracing.com/shop/ird-qb-95-bottom-bracket-4057
    – daddyblondlegs
    Commented Jan 11 at 4:41
  • If you’re on tour, there’s nothing to be done but ride to the nearest shop and have them assess it.
    – Paul H
    Commented Jan 11 at 5:58

1 Answer 1

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sounds like worn Bottom Bracket /crank bearings.

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    Welcome to Bicycles SE. We're looking for answers with more detail. Please consider editing your answer to explain why you believe the problem is worn bottom bracket bearings. A short, one-line answer like this is likely to get downvoted, flagged for moderator intervention, and possibly deleted.
    – jimchristie ♦
    Commented Jan 12 at 14:35

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