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  1. #1
    Junior Member wocketpatch's Avatar
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    rear hub identification (bearings)

    Hello,

    I'm looking to replace the bearings on a friend's bike. I've never done it before but of course that's why I volunteered to do it. I've read online in several places that "most" rear hubs have 9 1/4" bearings on each side so I was just about to order some 1/4" bearings when I thought "maybe I should have a look." Well, inside I found only 7 bearings on both sides which makes me wonder if they might also be a different size.

    The only identifying mark I can find on the hub says:

    K T
    ROCTAIWAN

    It's from a 70's World Traveler (schwinn import) and I don't know if the wheels are original but they are straight and look pretty nice on the bike so I feel like it's worthwhile.

    Thanks!

  2. #2
    Great State of Varmint Panthers007's Avatar
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    Most likely it was short by a few. This happens. Some manufacturers/stores are cheap. You need as many 1/4" BB's as will fit on each side into the races. Put in some grease, place the BB's in, add more grease - and begin adjusting.
    How do you keep an idiot in suspense?

  3. #3
    mechanically sound frankenmike's Avatar
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    The shipping on the bearings probably costs more than the product. Bring the bearings with you to your lbs and you'll be guaranteed to get the right size, for cheaper than ordering online.

  4. #4
    DOS
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    Get one of these a measure the bearings but probably they are 1/4".
    http://www.coloradocyclist.com/product/item/PARSSSBC1

  5. #5
    Great State of Varmint Panthers007's Avatar
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    With the shipping on the Park Tool ruler, or whatever, you could buy a digital caliper, batteries included. Costs about $15.00.

    For instance:

    [ame="http://www.amazon.com/Stainless-Digital-Caliper-Extra-Large-Screen/dp/B000GSLKIW"]Amazon.com: Stainless Steel 6" Digital Caliper with Extra-Large LCD Screen - Instant SAE-Metric Conversion: Home Improvement[/ame]

    You can find them cheaper, too. Just hunt on Amazon. Same one - re-branded - that Park Tool sells for about $40.

    Here it is for $14.94 including the shipping:

    [ame="http://www.amazon.com/Display-Digital-Caliper-Interface-Molded/dp/B0002JFMIO/ref=pd_sim_hi_1"]Amazon.com: 6 Inch Large Display Digital Caliper With Data Interface and Molded Case: Home Improvement[/ame]
    Last edited by Panthers007; 01-27-09 at 09:54 PM.
    How do you keep an idiot in suspense?

  6. #6
    DOS
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    [QUOTE=Panthers007;8260088]With the shipping on the Park Tool ruler, or whatever, you could buy a digital caliper, batteries included. Costs about $15.00.

    Yeah, but can it measure a spoke?

    Seriously, my tool box does not have digital caliper, and I didn't know they were so cheap. Thanks for the tip.

  7. #7
    Great State of Varmint Panthers007's Avatar
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    I checked the one I got for $14.94. Same outfit as the ad. Arrived real fast - sometimes a bad sign. So I checked with my $$$ dial-caliper for accuracy. It was spot-on. Park wants $50. I found Park for as low as $40. Which way ya gonna go, cowboy?
    How do you keep an idiot in suspense?

  8. #8
    Senior Member
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    Harbor Freight also has cheap calipers which I have been pleased with. They generally agree with the $$$ calipers I have compared them to. Note the generally, they do have a posted accuracy and while they are usually better than that should probably not be trusted to say, 0.001" at 6 inches out. I do not know what the posted accuracy is on the nicer machine shop ones I have used is.

  9. #9
    Great State of Varmint Panthers007's Avatar
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    The accuracy for these DC's are stated as .02mm, readable to .01mm. Comes in a plastic, cut-out foam case with an extra battery (2 batteries are enclosed).
    How do you keep an idiot in suspense?

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