Front Disc Bobbins

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

 

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.

 

Hi and thanks for your reply.
No they dont unscrew they are riveted together in the factory

 

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.

 

No probs, thanks for your input. Have a good weekend

 

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.

 

Look at EBC replacements, they are not to badly priced.

 

Thanks, I will check it out

 

So to follow up on this.
I found a pair of discs from a breaker with low mileage and fitted them to the bike.
Took the bike for MOT (CT) second visit and the guy said that there was still too much play. He reluctantly passed it but said that I should be very careful as it was dangerous to ride it like that.
I have searched all over the net but cannot find any definitive info on tolerances for the radial play, some say it needs some and some say that it shouldnt be there, very confusing.
So does anyone have any info on what Triumph say about the amount of radial play that is acceptable? Anyone have a manual that gives the tolerance?
I personally dont think it is an issue but it is still at the back of my mind whilst riding.
Any info greatly appreciated.

 

Have you tried another station for the MOT Triumph dealer if they do MOT'S there.

 

Thanks for your input Joe.
No I havent because here the MOT station (Its called CT (Control Technique) here) fail it and you have 2 months to put it right. If you go to another tester then you have to pay again for the full CT.
I am supposed to be going out for a little spin tmoz with a couple of guys so I did think of taking it to my local bike dealer and asking the question.
I will keep you posted
Thanks again