Front Disc Bobbins

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

  1. Beeroclock

    Beeroclock New Member

    Joined:
    Jul 30, 2025
    Messages:
    9
    Likes Received:
    3
    Trophy Points:
    3
    Location:
    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
     
    #1
  2. Adie P

    Adie P Crème de la Crème

    Joined:
    Jul 7, 2018
    Messages:
    2,303
    Likes Received:
    3,693
    Trophy Points:
    1,000
    Location:
    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.
     
    #2
    • Agree Agree x 1
  3. Beeroclock

    Beeroclock New Member

    Joined:
    Jul 30, 2025
    Messages:
    9
    Likes Received:
    3
    Trophy Points:
    3
    Location:
    France
    Hi and thanks for your reply.
    No they dont unscrew they are riveted together in the factory
     
    #3
    • Useful Useful x 1
  4. Adie P

    Adie P Crème de la Crème

    Joined:
    Jul 7, 2018
    Messages:
    2,303
    Likes Received:
    3,693
    Trophy Points:
    1,000
    Location:
    MID DEVON
    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.
     
    #4
    • Like Like x 1
  5. Beeroclock

    Beeroclock New Member

    Joined:
    Jul 30, 2025
    Messages:
    9
    Likes Received:
    3
    Trophy Points:
    3
    Location:
    France
    No probs, thanks for your input. Have a good weekend
     
    #5
    • Agree Agree x 1
  6. joe mc donald

    Subscriber

    Joined:
    Dec 26, 2014
    Messages:
    9,925
    Likes Received:
    15,248
    Trophy Points:
    1,000
    Location:
    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.
     
    #6
    • Agree Agree x 3
  7. Iceman

    Iceman Crème de la Crème

    Joined:
    Apr 19, 2020
    Messages:
    1,555
    Likes Received:
    2,715
    Trophy Points:
    1,000
    Location:
    Lancashire
    Look at EBC replacements, they are not to badly priced.
     
    #7
    • Agree Agree x 2
  8. Beeroclock

    Beeroclock New Member

    Joined:
    Jul 30, 2025
    Messages:
    9
    Likes Received:
    3
    Trophy Points:
    3
    Location:
    France
    Thanks, I will check it out
     
    #8
    • Agree Agree x 1
Loading...

Share This Page