Front Disc Bobbins

Discussion in 'Technical Help' started by Beeroclock, Aug 22, 2025.

  1. Beeroclock

    Beeroclock New Member

    Jul 30, 2025
    3
    3
    France
    Hi all, my Sprint ST has just failed its CT (MOT) on excessive radial movement on the front disc. I know the bobbins are there to allow a little axial movement but not radial.
    I have looked at the cost of a new disc and when I had recovered from my light headed moment I started searching for another fix.
    I found that BMW and some others do a bobbin replacement kit.
    Apparently, the bobbins are made from softer stuff than the disc and therefore wear first.
    Has anybody heard about this or have experience?
    I am going to remove the disc and drill out a bobbin and have a look later, will keep you posted
     
  2. Adie P

    Adie P Crème de la Crème

    Jul 7, 2018
    3,693
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    MID DEVON
    Am I missing something here? Why drill out the bobbins - don't they unscrew?

    I replaced discs on a recent Daytona purchase and bought new titanium bobbins - no rust, no fuss. Just hope that blue loctite is OK on titanium.
     
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  3. Beeroclock

    Beeroclock New Member

    Jul 30, 2025
    3
    3
    France
    Hi and thanks for your reply.
    No they dont unscrew they are riveted together in the factory
     
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  4. Adie P

    Adie P Crème de la Crème

    Jul 7, 2018
    3,693
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    Ah, apologies, OK - my mistake ... I thought you meant the disc to hub carrier bolts but now realise you mean the rotor to centre/hub carriers which, as you say, are factory pressed. No cheap and/or easy answer for you, I fear.

    I'd guess your best bet will be to keep an eye on ebay for good used. Wish you luck.
     
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  5. Beeroclock

    Beeroclock New Member

    Jul 30, 2025
    3
    3
    France
    No probs, thanks for your input. Have a good weekend
     
    • Agree Agree x 1
  6. joe mc donald

    Subscriber

    Dec 26, 2014
    15,239
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    slough / burnham
    I think i would give eBay a miss on things like discs. You would probably end up buying something as bad as you already have. Unless you can go and see in person.
     
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  7. Iceman

    Iceman Crème de la Crème

    Apr 19, 2020
    2,715
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    Look at EBC replacements, they are not to badly priced.
     
    • Agree Agree x 2
  8. Beeroclock

    Beeroclock New Member

    Jul 30, 2025
    3
    3
    France
    Thanks, I will check it out
     
    • Agree Agree x 1
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