Rotors….Which Ones?
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
It's the better coefficient of friction the MMC provides, especially when pad material is deposited on it. Better CF means the pads grab harder on the rotor. Stainless steel has a pretty bad CF that's why cars use cast iron rotors. In fact if you ride off with brand new stainless rotors you will scare yourself how bad the brakes are until they break in.
A lesser improvement is the floating rotors track straighter in the calipers so the pads aren't moving back and forth (tiny amounts) like solid rotors.
Thanks...
A lesser improvement is the floating rotors track straighter in the calipers so the pads aren't moving back and forth (tiny amounts) like solid rotors.
Thanks...
Seasoned HDF Member
Joined: Jun 2012
Posts: 6,154
Likes: 2,561
From: CT/FL
Yes I am aware of co efficient of friction. I took off my stainless rotors on my '91 Fatboy and put PM cast iron rotors on it. Made a helluva difference. I couldn't find any data on CMM co efficient of friction anywhere so I assumed it was very similar to ss, I figured if it was greater they would plaster that fact all over the place. And yes SS sucks , even worse when some yay who polishes them, LOL.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
You really don't need 2 piece iron rotors they are much more thermally stable than ss. The only issue may/can be the thickness needed sometimes may be different than the ss rotors on the bike. On my FLSTF I remember there was some wrinkle concerning that, either the fr or the rear needed to be thicker than the oem rotor so we needed to replace the caliper, I think it was the rear but I cant remember, it was 20 years ago, LOL. Also they were Flash Chromed so as the pads scrubbed off the chrome on the rotors it exposed the raw iron. Then you removed the pads and sanded them lightly on a surface plate to remove the chrome particles and re installed. Then you could get after it. The rotors would obviously get light surface rust on that area on the rotors and the chrome being only just 1 stage flash chrome wasn't aesthetically pleasing but I didn't care I was after better braking and the chrome stopped the rust where the pads didn't track on the rotors.
Last edited by qtrracer; Sep 17, 2014 at 11:09 AM.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
They currently have no pads and cannot supply a set of three rotors, so anyone wanting a new set-up is likely to be out of luck!
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