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  1. #1
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    1981 Miyata 310 Bottom Bracket - what length??

    The old bottom bracket looked waaaay too wide - like 1cm at least. I have a 103mm bb which fits the non drive side perfectly but the drive side needs more length - there 's a deeper recess for the bb spindle than on more modern cranks.

    the crank says miyata as well.

    anyway, i'd be impressed if anyone could dig up this bit of knowledge.

  2. #2
    Still learning oddjob2's Avatar
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    Even though the crankset may be pantographed Miyata, the back of it may have the manufacturer's ID. Once you figure that out, look here.

    Sheldon Brown's Bottom Bracket Size Database
    Life is like riding a bicycle. To keep your balance you must keep moving. Albert Einstein
    2015 Additions: 2001 Eddy Merckx AX Titanium, 1981 Peugeot PKN10, 1987 Centurion Ironman Expert, Raleigh Super Course MKII

  3. #3
    Senior Member catmandew52's Avatar
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    Maybe this would help, http://4.bp.blogspot.com/_whtVpXkKwl...600/img013.jpg

    Catalog says should be SR crankset.
    Take care that no one hates you justly. ~Publilius Syrus

  4. #4
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    looks like its an SR SI-5DRG-AH

  5. #5
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  6. #6
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    fwiw - i installed a 122mm bb and everything looks good so far. i'll report back with any updates.

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