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Ceramic or steel bottom bracket.

Comments

  • #2
    petethedrummer
    Registered Users, Registered Users 2 Posts: 7,604 ✭✭✭petethedrummer


    I have no idea myself but I found this amusing....
    Ceramic bearings do have a place in performance bicycles just as they do in other fields. For example, if you are a 600 lb rider, and you often ride in temperatures over 500 degrees F, and your bearings are spinning at 5000+ rpm, then they should hold up longer and provide less friction than steel bearings. In fact, at speeds over 20,000 rpm ceramics really shine compared to steel

    Here are other ceramic bearing applications that are just like a bicycle bottom bracket:

    Aircraft generators
    Biotechnology equipment
    High speed machining and grinding spindles
    high speed mills
    Precision instruments
    Pumps and compressors

    Also, ceramic bearings are lighter, so weigh your steel bearings (1 gram each for .25"), and deduct about 30% to get your equivalent ceramic weight. So a BB, with 18 bearings, will save about 6 grams.

    http://www.bikeforums.net/archive/index.php/t-222894.html


  • #3
    Muckers
    Registered Users, Registered Users 2 Posts: 504 ✭✭✭Muckers


    Thanks for that Pete. It seems they're not worth the money and apparently don't last as long as steel bearings.


  • #4
    Donelson
    Closed Accounts Posts: 456 ✭✭Donelson


    Surely, the non conducting nature of ceramics would help you to survive if you where struck by lighting. these things could be life savers.


  • #5
    kumate_champ07
    Closed Accounts Posts: 7,150 ✭✭✭kumate_champ07


    I had them in a rear hub, got a good deal,
    they lasted 50km.

    well the drive side went. 1 is still smooth while the other is noticeably rough.

    better to get some steel enduro bearings and run them without seals and a little oil instead of grease for important races, thats if your hub has a decent bearing guard at the side. with the savings buy the proper installation tool from wheels mfg or enduro. you can ruin a cartridge bearing easily if your not careful


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