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  1. #1
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    Trek 400d Bottom Bracket Size

    Hi. I have a Trek 400d (86 or 87, I think). Does anyone know what size bottom bracket it uses? There is some play in the cranks, and the original bottom bracket is so old I don't think it would be worth it or possible to overhaul it, especially since I imagine the cup/cone would be damaged. It uses an SR SXC-200 crankset, which I couldn't find any info on. The reason I don't disassemble it and measure it straight away is because it's a lot harder to get to the bike shop on foot. Thanks for any help.

  2. #2
    Old fart JohnDThompson's Avatar
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    It should be a bog-standard, English thread, 68mm wide shell.

  3. #3
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    But I still need to know the length of the spindle, right?

  4. #4
    Senior Member
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    You will have to pull the cranks to find out the size you need as cranks have different offsets, models,brands ect.. Also if there is a lot of clearance to the frame you can go a size smaller in width.

  5. #5
    Senior Member
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    Ah ok. Thanks.

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