Asymetical Brake Rotors

[Black_peter]

Has anyone else noticed this?
I was looking at a Harley parked at work the other day and noticed the rotors were asymmetrical. In my head I was saying "huh, while Japanese bikes like this Ninja (250) are......"
Son of a gun.. It's rotors were asymmetrical too..

Harley:
Starting at 6 o'clock. 1, 1, 2, 2 close to 3, 1, 1, 2 close to 2, 2, 2, 1, 1, 1..


Ninja 250
Front and rear.. Notice starting at 6 o'clock two sets of 3 holes then a tighter set, big gap 3 big gap 3


While I could rampantly speculate about this.. Anyone know for sure?

[reconstyle]

Whats the question BP?

I think I'm missing something somewhere here...

[md86]

I think the question is "does BP have too much time on his hands? And if so , how can we better occupy him? " ....

[Black_peter]

You know.... I posted that 5 days ago.. Y'all were scraping the bottom of the barrel to find it!!

[md86]

Nah , I just don't have the time to read EVERY post like I used to . SOmetimes older ones I missed come back up and I see them and can make fun of people THEN . I mean damn , over 5300 members , over 4 pages of new posts every night ...... It takes like 4 hours to go through the new stuff every day . That REALLY cuts into my porn time .

[Black_peter]

4 hours.. Dude you have to get rid of dial up..

[md86]

Got a cable . I just read slow I guess . Then the people IM'ing me kinda don't help . Then the playing with the music programs .......

[squiggy]

Re: Asymetical Brake Rotors

Harley:
Starting at 6 o'clock. 1, 1, 2, 2 close to 3, 1, 1, 2 close to 2, 2, 2, 1, 1, 1..

Are you talking about the bolt pattern or the lighting holes or.....14 holes as opposed to 22 holes or.....

[crazyaussie]

Whats the question BP?

I think I'm missing something somewhere here...

Actually, I think BP asked TWO very distinct questions in his post...

Has anyone else noticed this?

and

Anyone know for sure?

My answer to these profound questions is 1) Yes, I've noticed and 2) While I can't speak for everyone, I am POSITIVE that I noticed.

[Black_peter]

My answer to these profound questions is 1) Yes, I've noticed and 2) While I can't speak for everyone, I am POSITIVE that I noticed.

And that ladies and gentlemen is the result of college education...


I was talking about the holes drilled through the swept portion of the rotors.
The holes are totally asymmetrical. I could come up with lots of wise ass comments on why a Harley is designed that way but the Ninja 250 is that way too.. I haven't dug too deep but I wonder if it is limited to small displacement imported bikes and if the reasoning is similar to why Harley does it..
I guess the answer to the first question is no, since you didn't notice it in the pics I posted never mind on a bike on the street. And to the second question obviously no as well...

[crazyaussie]

My answer to these profound questions is 1) Yes, I've noticed and 2) While I can't speak for everyone, I am POSITIVE that I noticed.

And that ladies and gentlemen is the result of college education...

Apparently you are mistaken BP...THAT is what you get when you hang on the boards enough and must compete with yourself for best smart ass award!

[Black_peter]

Apparently you are mistaken BP...THAT is what you get when you hang on the boards enough and must compete with yourself for best smart a$$ award!

[steves]

My answer to these profound questions is 1) Yes, I've noticed and 2) While I can't speak for everyone, I am POSITIVE that I noticed.

And that ladies and gentlemen is the result of college education...


I was talking about the holes drilled through the swept portion of the rotors.
The holes are totally asymmetrical. I could come up with lots of wise a$$ comments on why a Harley is designed that way but the Ninja 250 is that way too.. I haven't dug too deep but I wonder if it is limited to small displacement imported bikes and if the reasoning is similar to why Harley does it..
I guess the answer to the first question is no, since you didn't notice it in the pics I posted never mind on a bike on the street. And to the second question obviously no as well...

'Cause it looks cool?

[tzortn]

I would guess one of three reasons:

Stress - the random pattern reduces the stress risers. Some people go and drill their own rotors and they end up weakening them because the holes end up acting like perforations on a sheet of paper.

Noise - The random pattern is less likely to create the whistling noise commonly created by cross drilled rotors.

Vibration/chatter - The random pattern is less likely to excite a resonance of even just a consistent vibration. This would cut down on vibration under braking.

Those are my guess, but I am not a brake engineer.

[Black_peter]

I would guess one of three reasons:

Stress - the random pattern reduces the stress risers. Some people go and drill their own rotors and they end up weakening them because the holes end up acting like perforations on a sheet of paper.

Noise - The random pattern is less likely to create the whistling noise commonly created by cross drilled rotors.

Vibration/chatter - The random pattern is less likely to excite a resonance of even just a consistent vibration. This would cut down on vibration under braking.

Those are my guess, but I am not a brake engineer.

Wow we don't hear from you in a while and boom you post that??
Impressive!