Help me understand rotors.
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Tourer
Joined: Sep 2010
Posts: 307
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Help me understand rotors.
I have a 2013 street glide and put aftermarket rotors on the front. I don't think they are floating rotors. This is what I'm dumb at. Are stock ones floating rotors? What exactly does it mean. Never had a problem with the stock ones as pulsating goes. My new ones are pulsating. They are brand new but seem warped.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,168
From: SE Michigan
Stock rotors suck. They are not floating rotors. They warp very easily. Floating rotors are better but not a panacea.
Look at these rotors - one piece. http://www.harley-davidson.com/store...tors-41831-05a
Now look at these - two piece. http://www.harley-davidson.com/store...03-4482200a--1
From what I understand rotors can warp if you come to a long fast stop and keep the brakes squeezed so that the pads stay on the rotors, creating a hot spot. Someone else may be able to explain better than I can what causes warping.
Being two piece, floating rotors isolate the heat.
Look at these rotors - one piece. http://www.harley-davidson.com/store...tors-41831-05a
Now look at these - two piece. http://www.harley-davidson.com/store...03-4482200a--1
From what I understand rotors can warp if you come to a long fast stop and keep the brakes squeezed so that the pads stay on the rotors, creating a hot spot. Someone else may be able to explain better than I can what causes warping.
Being two piece, floating rotors isolate the heat.
Last edited by Keithhu; Mar 18, 2014 at 04:06 PM.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
that is one cause, brakes work through heat, allowing the rotors to get hot will warp them.
this is why it is smarter to control speed with releasing the throttle, than only using the brakes ( and proper F/R brake balance), this means keeping the revs up, at 3500 rpm if you release the throttle the bike will slow, at 2000 rpms, it would more like coast.
I have good results with the stock rotors.
I have never needed to replace rotors on my 1988, 1995 or 2009.
I use mostly stock pads and they have been fine. I do have EBC's on the 1988 FXR, and they have also been good.
Mike
Road Captain
Joined: Nov 2007
Posts: 654
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Good day.
In the 1920s Douglas built the first disc brakes. Motorcycle discs are usually stainless steel, drilled and occasionally slotted, to help remove rain water. Many motorcycle discs are of a floating design where the disc rides on small dowels and is allowed to slightly move laterally. This allows for better disc centering when used with a fixed caliper. It can also prevent heat transfer to the wheel hub under hard braking. This allows the disc to expand while heating up without increasing tension in such a way that the disc would become warped.
This from Wikipedia…..
Ride In Peace
In the 1920s Douglas built the first disc brakes. Motorcycle discs are usually stainless steel, drilled and occasionally slotted, to help remove rain water. Many motorcycle discs are of a floating design where the disc rides on small dowels and is allowed to slightly move laterally. This allows for better disc centering when used with a fixed caliper. It can also prevent heat transfer to the wheel hub under hard braking. This allows the disc to expand while heating up without increasing tension in such a way that the disc would become warped.
This from Wikipedia…..
Ride In Peace
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