This topic contains 9 replies, has 0 voices, and was last updated by Mick D 14 years, 1 month ago.
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January 24, 2011 at 7:58 am #99464
Hey Bulls
What is the advantage of a floating disc rotor as opposed to a fixed? I have heard it helps dissipate heat but is that relevant to a recreational trail rider?
CheersSTM
January 24, 2011 at 8:11 am #195122Not sure how it dissipates heat differently to a fixed, haven’t thought about but :blink:
I thought the benefit was to reduce pad knock off.
TB
January 24, 2011 at 8:24 am #195123That’s right, it does help reduce pad knock off. Coming from a racing back ground……… The advantage of floating v,s fixed is that a fixed rotor is more likely to warp with extreme heat then creating pad knock off. Where as a floating rotor has room for expansion and contraction and is less likely to warp. Particularly if you are really hard on the picks then come into a deep creek crossing. The fixed rotor may warp due to the sudden quenching from the water. Floating are good for hard core fast guys. Not for wood-ducks like me.
Hope this helps.Cheers,
LeftyJanuary 24, 2011 at 9:00 am #195127When the ‘floating’ spacers wear down the disc rattles like a bastard and annoys the crap out you.
Other riders think your bike is about to blow up. :laugh:
January 24, 2011 at 9:33 am #195129mal5.1 wrote:
Quote:When the ‘floating’ spacers wear down the disc rattles like a bastard and annoys the crap out you.Other riders think your bike is about to blow up. :laugh:
Mine is getting very floaty as you say mate which is why I was considering fixed. I always opted for fixed over float on my Mtb’s as I preferred the more positive feel at the lever. If fixed is ok I will give it a go on my WR.
STM
January 24, 2011 at 9:41 am #195135singletrackmind wrote:
Quote:mal5.1 wrote:Quote:When the ‘floating’ spacers wear down the disc rattles like a bastard and annoys the crap out you.Other riders think your bike is about to blow up. :laugh:
Mine is getting very floaty as you say mate which is why I was considering fixed. I always opted for fixed over float on my Mtb’s as I preferred the more positive feel at the lever. If fixed is ok I will give it a go on my WR.
STM
My EBC I had on the XR got loose and floaty (word :laugh: ) I just re-squashed the rivets and tightened it up, noise gone
TB
January 24, 2011 at 10:35 am #195136Trailboss wrote:
Quote:singletrackmind wrote:Quote:mal5.1 wrote:Quote:When the ‘floating’ spacers wear down the disc rattles like a bastard and annoys the crap out you.Other riders think your bike is about to blow up. :laugh:
Mine is getting very floaty as you say mate which is why I was considering fixed. I always opted for fixed over float on my Mtb’s as I preferred the more positive feel at the lever. If fixed is ok I will give it a go on my WR.
STM
My EBC I had on the XR got loose and floaty (word :laugh: ) I just re-squashed the rivets and tightened it up, noise gone
TB
Cheers TB. I will take it off and give it a hit.
STM
January 24, 2011 at 11:18 pm #195140Anyone care to explain “pad knock off”? :S Never heard that phrase before.
January 24, 2011 at 11:46 pm #195124Hello Mick,
“Pad Knock Off”
My interpretation, all discs have a certain amount of run out (you could call it warp) this allows the pads after application to be forced back off the disc a bit to allow for free rotation of the wheel.”pad knock off”
If this run out is extreme it will force the pads back further than acceptable so when you grab your lever the pads will have to travel further to apply pressure to the disc.
The feeling is like having no brakes in the initial stage.
This can be just enough to cause an issue when you really need those brakes.
The problem becomes worse when the pads are worn.
With a large disc run out and worn pads in extreme cases you can get the piston jamming in the caliper.
So the pads will not apply at all.The opposite of all this is to have no pad knock off which will cause the pads to stay against the discs causing premature pad wher and in extreme cases boiling of the brake fluid.
As i said this is my undestanding of pad knock off.
Rebore.
January 24, 2011 at 11:49 pm #195157Thanks Rebore, stands to reason, so I am happy with your explaination.
Cheers
Mick -
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