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Thread: 1972 BMW R75/5 - Swing Arm Bearings

  1. #1
    Registered User b25bsaboy's Avatar
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    1972 BMW R75/5 - Swing Arm Bearings

    Good day to you all!

    Cleaned my swing arm yesterday with emphasis on the swing arm bearing area. The question came to mind, do they need replacing and how can one tell if the do? From what I remember on the R75/6 project, you have to remove the outer seals to inspect and make a decision from that point or can it be done without destroying the seal?
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 73 R75/5 SWB, 2008 Honda GL-1800 Lehman Trike

  2. #2
    Registered User lmo1131's Avatar
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    These are only "fractional" rotation bearings, meaning they don't revolve a full 360°. Highly unlikely they would need to be replaced unless they had been submerged under water, etc. Like any bearing, test them by inserting your fingers and rotate them, if they feel "notchy" ( I'd be really surprised if they did) just rotate them 90° when you reassemble.

    There is no seal to remove (unless someone replaced them with a non-OEM shielded bearing at some point).

    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  3. #3
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by lmo1131 View Post
    These are only "fractional" rotation bearings, meaning they don't revolve a full 360°. Highly unlikely they would need to be replaced unless they had been submerged under water, etc. Like any bearing, test them by inserting your fingers and rotate them, if they feel "notchy" ( I'd be really surprised if they did) just rotate them 90° when you reassemble.

    There is no seal to remove (unless someone replaced them with a non-OEM shielded bearing at some point).

    Thank you again Les for your wisdom, as your answer makes perfect sense! If it ain’t broke, why fix it!
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 73 R75/5 SWB, 2008 Honda GL-1800 Lehman Trike

  4. #4

    Swingarm bearings

    Quote Originally Posted by b25bsaboy View Post
    Thank you again Les for your wisdom, as your answer makes perfect sense! If it ain’t broke, why fix it!
    Also, they'll last nearly forever if pre-loaded correctly and greased regularly.

    Conventional procedure is to pre-load each to 15 ft. lbs., then back off and set to 7-9 ft. lbs.

    RickR90s

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