All I can say is what happened to me. My thought was that the inner carrier was not of appropriate material (aluminum?) or hardness to support full floating for an indefinite mileage. If the discs were full floating from the factory (OEM) this issue would have been resolved during the design phase. Having said this, I do think others with ST4s's have installed ff buttons without problems. Maybe they haven't reached the mileage for this issue to show up.
Randy
I figure that both my speed triple and tuono both have/had full floaters as OEM. They have 6 button discs and the ST4s has a whole 10. If Triumph and Aprilia rotors do not wear out in the button area how can the ST4 units with more buttons to take the force??
On the rattle there is no additional noise whatsoever with the full floating buttons once the bike is on the move. They do rattle when the the front end hits the steering stop at a standstill or when moving around the garage. I could hear noise from the Speed triple front end under braking.
I tested them with some very rigorous breaking on the ride yesterday!! Even tried to get the ABS to kick in on light gravel but I chickened out before lock up. I am very impressed with the improvement/remedy. Prior to the change the pulse was so bad I had to use the rear brake to pull up from 20kph to a stop. I am amazed that it passed its recent warrant of fitness.
The lH rotor is slightly warped but now I can wait till next maintenance to easily remove the buttons to separate the outer rotor, which I can then sling on the surface grinder at work...job done.
Happy Riding
Nick L
--- In st2_owners@yahoogroups.com, rntdumont@... wrote:
>
> NickW
> I put a full floating kit in my stock rotors and it was bichen for about 6K miles then I started to get some front end shake. They wore so much that they would go off center and cause imbalance. I replaced the rotors with a good used set and the front end shake went away. Maybe that is why the factory uses semi? The bike is an 04ST4s.
> Randy
>
> Sent from my Verizon Wireless BlackBerry
>
>> >
>
> OK, if full-floating buttons work so much better, why do we have the semi-floaters? I see the Corse Dynamics full-floaters warn of more rattle, and it puts me in mind of the Ducati dry clutch situation where the more they rattle, the more they seem to wear. Perhaps this isn't relevant because all the motion in a brake disc situation is in one direction, consistent and relatively-smooth. Maybe it's just a question of degree: semis will compensate for minor/residual disc runout but fulls are needed in the worst case. Note that neither will compensate for disc thickness variation and it wouldn't take much!
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> NickW
>
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