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  1. #1
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    Chain Ring Bolts

    While cleaning my 82 Fuji Supreme (12 speed) I noticed that I lost one of the chain ring bolts and all others were loose. So, I tightened all with a 5mm allen wrench, the same one that fits most water bottle cage bolts. When I try to find a replacement for the lost one on Ebay, I see only M8 bolts.

    What is the correct size for my bike?
    What is the best place to get them - besides LBS.

  2. #2
    Quirky Grifter LesterOfPuppets's Avatar
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    M8 is the diameter of the bolt, not the size of the wrench. Pretty much the standard for chainring bolts. Just gotta make sure you get the right length of nut. They typically just spec for single or double.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  3. #3
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    OK, Thanks

  4. #4
    Andrew R Stewart Andrew R Stewart's Avatar
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    Actually M8 is the threading dimension spec, not the wrench size, and also M8 is not the diameter of thread pitch of many chain ring bolts. The common two piece CR bolt is a 8x.75. As in 8 mm diameter and .75mm per thread. A M8 has a 1.25mm per thread pitch. The two piece bolt and nut has a 10mm OD to the nut, the part that needs to fit within the ring and crank arm fitting.

    Don't forget to grease the bolt and nut, then recheck the tightness after a few rides. Andy.

  5. #5
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    Thanks

  6. #6
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    I ordered this item
    231282608913

    and they don't fit. They are slightly larger.
    Is there a special size for the Fuji Supreme? They were described as appropriate for old style and road bikes.
    The original ones are solid. The above is hollow. I find almost all sold now are hollow. Some are sold in set of 4 (for MTB) and some as set of 5.
    Also, does Raceface has different spec?

    Fuji Supreme has a SUGINO Aero No. 5 crank set.

    Thanks
    Last edited by ak08820; 08-08-14 at 12:13 PM.

  7. #7
    Quirky Grifter LesterOfPuppets's Avatar
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    4 hole is becoming more and more popular on road, also.

    Wow, that is an interesting crankset indeed. I'd probably replace the whole crankset, at least the right arm, perhaps casually look for replacement hardware for the Aero #5 afterwards if you wanna go back to original spec.

    To replace the cranks you'll have to find the bottom bracket spindle length so that you can find some cranks that will fit.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

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