Okay..help me out here.
#12
11-27-2006 | 08:26 PM
Road Master
Joined: Nov 2006
Posts: 1,227
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From: Central Illinois
RE: Okay..help me out here.
Goth, It IS a rotational push / pull issue. All bikes including big twins are this way. The cutouts serve a purpose also. Since Harley introduced their new brakes they eliminated floating discs and or calipers on stock bikes. The cutouts in the rotor are machined in a way that the rotor can flex as braking pressure is applied. If you strap our bike onto a trailer or into a Dyno and leave the strap across your rotor you will notice how easy it bends. The Sporster has since recieved new brakes that do float on pins and the rotors were carried over.
#14
11-28-2006 | 01:18 AM
Road Warrior
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RE: Okay..help me out here.
You can't "just flip it over" on any disc rotor and place it back on the same side. The machined recesses for the attachment machine screws won't allow that. You CAN move a left mounted rotor to the right side and vice versa if you have dual disc brakes.
If you have a single disc rotor up front, you can purchase one from H-D or off of e-Bay that was built for right side mounting and place it on your left side. That will reverse the pattern of the scroll for you.
Most of the time, any hole, slit or pattern hole cut in a rotating brake disc is engineered to help carry away water, heat and brake dust from the brake pads. Since motorcycle disc brakes are so exposed to the airstream that purpose or need is probably not significant. I maintain that the 'scroll' pattern is just styling on our H-D brakes. I do think strongly that the 'floating rotor' design is a big step up in braking efficency. ..................... BC
If you have a single disc rotor up front, you can purchase one from H-D or off of e-Bay that was built for right side mounting and place it on your left side. That will reverse the pattern of the scroll for you.
Most of the time, any hole, slit or pattern hole cut in a rotating brake disc is engineered to help carry away water, heat and brake dust from the brake pads. Since motorcycle disc brakes are so exposed to the airstream that purpose or need is probably not significant. I maintain that the 'scroll' pattern is just styling on our H-D brakes. I do think strongly that the 'floating rotor' design is a big step up in braking efficency. ..................... BC
#15
11-28-2006 | 03:31 AM
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RE: Okay..help me out here.
ORIGINAL: Gutman
Goth, It IS a rotational push / pull issue. All bikes including big twins are this way. The cutouts serve a purpose also. Since Harley introduced their new brakes they eliminated floating discs and or calipers on stock bikes. The cutouts in the rotor are machined in a way that the rotor can flex as braking pressure is applied. If you strap our bike onto a trailer or into a Dyno and leave the strap across your rotor you will notice how easy it bends. The Sporster has since recieved new brakes that do float on pins and the rotors were carried over.
Goth, It IS a rotational push / pull issue. All bikes including big twins are this way. The cutouts serve a purpose also. Since Harley introduced their new brakes they eliminated floating discs and or calipers on stock bikes. The cutouts in the rotor are machined in a way that the rotor can flex as braking pressure is applied. If you strap our bike onto a trailer or into a Dyno and leave the strap across your rotor you will notice how easy it bends. The Sporster has since recieved new brakes that do float on pins and the rotors were carried over.
#16
12-01-2006 | 11:50 AM
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#17
12-01-2006 | 06:55 PM
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#19
12-02-2006 | 04:41 AM
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RE: Okay..help me out here.
I've heard of the "middle leg," but not the middle wheel...
ORIGINAL: GothMetalGuitarist
I would agree with that hypothesis if the front wheel where rotating in an opposite direction. When it gets down to it, both brakes are doing the same thing. Stopping a rotating wheel from turning. If it were a matter of pushing or pulling...what would you do if the bike had 3 wheels? Front, Middle, Rear? What would the middle wheel be classified as in your theory... This is why I am confused. To me, that disc brake (front) should be turned around.
The ONLY thing I can come up with is that it doesnt matter in the strength dept. If the Rotor is turned around on the front, maybe, just maybe the wheel will pull to one side or the other... by reversing this rotor they balance the pull on the brakes to compensate for both discs being on the same side of the bike.. I am still, confused. And I am NOT sleeping....stuff like this bothers the crap out of me. hehe. And no, the drugs aren't helping.
ORIGINAL: SportyPig
Just a guess here, with my LIMITED knowledge of physical science. I think they're both directional, and I'm not sure I can type what I'm thinking. But, I'll try. The front brake is stopping a force that is pushing. The rear brake is stopping a force that is pulling. Does that make since? I could ramble on here, but as previously mentioned, with my limited knowledge of physical science, that would probably just further confuse the issue.
Just a guess here, with my LIMITED knowledge of physical science. I think they're both directional, and I'm not sure I can type what I'm thinking. But, I'll try. The front brake is stopping a force that is pushing. The rear brake is stopping a force that is pulling. Does that make since? I could ramble on here, but as previously mentioned, with my limited knowledge of physical science, that would probably just further confuse the issue.
The ONLY thing I can come up with is that it doesnt matter in the strength dept. If the Rotor is turned around on the front, maybe, just maybe the wheel will pull to one side or the other... by reversing this rotor they balance the pull on the brakes to compensate for both discs being on the same side of the bike.. I am still, confused. And I am NOT sleeping....stuff like this bothers the crap out of me. hehe. And no, the drugs aren't helping.
