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Topic: What's with this rotor?  (Read 1724 times)
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kevin_stevens
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« on: July 20, 2010, 08:32:35 PM »
This guy pulled up in front of the cheese-steak shop where we were having lunch and wandered off with his buddy to another store.  After awhile I took a closer look and realized that the hole pattern in this rotor is a pretty complex pattern.  His friend's bagger (I think also a Road King) was the same.

Is this pattern a sensor ring of some kind for ABS or speedometer, or what's it about?  I want to bash it, but need to understand it better first.   Cool

KeS
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« on: July 20, 2010, 08:32:35 PM »
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« Reply #1 on: July 20, 2010, 10:45:29 PM »
It's just a clever, and stock, way to lighten the rotor and reduce the unsprung weight.
Sure it would help more if the wheel and steel fender didn't weigh 60lbs butt still..
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« Reply #2 on: July 21, 2010, 04:18:29 AM »
I would have thought the drilling would be symetrical. Headscratch Perhaps it's a mod that I wouldn't understand Lol
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« Reply #3 on: July 21, 2010, 04:26:50 AM »
Duh, them are "speed holes."
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chornbe

« Reply #4 on: July 21, 2010, 04:40:22 AM »
Balancing it?

It's not ABS sensing.

That's an earlier one than the '09 that's in my shop at the moment. The '09 in the garage has a very different pattern, but then the '08s and '09s have whole new brakes from previous models.
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Prubert
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« Reply #5 on: July 21, 2010, 04:58:11 AM »
The holes help the disc flex like a floating rotor.
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« Reply #6 on: July 21, 2010, 06:41:35 AM »
The model year shown doesn't have ABS. I'd say the holes are for balancing purposes. Is the red color on the rotor a reflection or marking dye?
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« Reply #6 on: July 21, 2010, 06:41:35 AM »

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fhaze
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« Reply #7 on: July 21, 2010, 06:56:39 AM »
It doesn't really matter..the damn thing will never get used anyway.
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chornbe

« Reply #8 on: July 21, 2010, 10:09:02 AM »
Quote from: Geoff on July 21, 2010, 06:41:35 AM

The model year shown doesn't have ABS. I'd say the holes are for balancing purposes. Is the red color on the rotor a reflection or marking dye?


Looks like reflection.


Quote from: fhaze on July 21, 2010, 06:56:39 AM

It doesn't really matter..the damn thing will never get used anyway.


Fair point. Those things are dangerous.
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kevin_stevens
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« Reply #9 on: July 21, 2010, 10:27:31 AM »
Quote from: JustCallMeChris on July 21, 2010, 04:40:22 AM

Balancing it?

It's not ABS sensing.

That's an earlier one than the '09 that's in my shop at the moment. The '09 in the garage has a very different pattern, but then the '08s and '09s have whole new brakes from previous models.


I would doubt balancing just because both bike's rotors were exactly the same.

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kevin_stevens
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« Reply #10 on: July 21, 2010, 10:28:04 AM »
Quote from: Geoff on July 21, 2010, 06:41:35 AM

The model year shown doesn't have ABS. I'd say the holes are for balancing purposes. Is the red color on the rotor a reflection or marking dye?


Reflection.

KeS
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« Reply #11 on: July 21, 2010, 03:32:22 PM »
Same drill pattern as my 07 E-Glide, and if I remember correctly, my 01 Dyna Glide T-Sport.  Who cares?  It stops the bike.  
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« Reply #12 on: July 21, 2010, 03:43:48 PM »
Quote from: Playinthestreet on July 21, 2010, 03:32:22 PM

Same drill pattern as my 07 E-Glide, and if I remember correctly, my 01 Dyna Glide T-Sport.  Who cares?  It stops the bike.  


Well, obviously I care, enough to start the thread, anyway.  I like to know the reasons for things.  Shrug

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« Reply #13 on: July 21, 2010, 03:47:59 PM »
Inquiring minds want to know.
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« Reply #13 on: July 21, 2010, 03:47:59 PM »

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« Reply #14 on: July 21, 2010, 05:08:54 PM »
Some of it is for looks and some of it is to help the disk from deforming as it heats/cools during use.

It tries to do the same thing that a full floating disk does....
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Prubert
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« Reply #15 on: July 21, 2010, 05:18:52 PM »
I would have thought the drilling would have to be symetrical to maintain balance. Headscratch
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« Reply #16 on: July 22, 2010, 09:36:17 AM »
Quote from: mugwump58 on July 21, 2010, 05:18:52 PM

I would have thought the drilling would have to be symetrical to maintain balance. Headscratch


Looks over function in the Harley world.
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chornbe

« Reply #17 on: July 22, 2010, 09:59:47 AM »
Quote from: nferr on July 22, 2010, 09:36:17 AM



Looks over function in the Harley world.


 Headscratch Huh?

Symmetrical would look good. That's certainly not for looks.
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« Reply #18 on: July 22, 2010, 11:48:12 AM »
Quote from: Prubert on July 21, 2010, 05:08:54 PM

Some of it is for looks and some of it is to help the disk from deforming as it heats/cools during use.

It tries to do the same thing that a full floating disk does....

Scheez, you gave the correct answer twice now and they still don't get it!  Headscratch Yes, the pattern  allows for expansion of the rotor so it's warp resistant like a 2 piece semi/full floating rotor.  Thumbsup  

 
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« Reply #19 on: July 22, 2010, 12:03:31 PM »
Quote from: st ryder on July 22, 2010, 11:48:12 AM


Scheez, you gave the correct answer twice now and they still don't get it!  Headscratch Yes, the pattern  allows for expansion of the rotor so it's warp resistant like a 2 piece semi/full floating rotor.  Thumbsup  

 


What does having an uneven pattern (is it even a pattern?) have to do with expansion?  Holes or no holes the metal will expand and contract, I fail to see the relationship.  Full floating rotors float, non floating rotors don't.

The only reasons to have holes, that I know of,  are for venting (cooling) or for cleaning the swept area of the brake pad as you're braking.

 
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