What is the reason the braking surface of a disc has so many holes?
I notice on the more high end bikes the discs have a ton of holes on them. Is this to save weight or what? Would the cheaper discs with less holes provide more braking power since there´s more friction due to more material rubbing against each other?
|
Originally Posted by Obeast
(Post 20904924)
I notice on the more high end bikes the discs have a ton of holes on them. Is this to save weight or what? Would the cheaper discs with less holes provide more braking power since there´s more friction due to more material rubbing against each other?
|
As stated, increased surface area for heat managment.
|
Originally Posted by Obeast
(Post 20904924)
I notice on the more high end bikes the discs have a ton of holes on them. Is this to save weight or what? Would the cheaper discs with less holes provide more braking power since there´s more friction due to more material rubbing against each other?
|
Originally Posted by Koyote
(Post 20905055)
Honest question: have you ever heard of google?
|
Originally Posted by eja_ bottecchia
(Post 20905062)
Sometimes it is better to check with your mates and get a conversation going. Google is not always the final, or most accurate, authority.
My point is that many questions have already been asked and answered about a thousand times. And I wouldn't go with this response if the OP didn't already have a history of this sort of thing. We're talking about an OP who recently started a thread asking for advice on how to take a crap in the woods...Apparently he keeps falling into his own s**t: https://www.bikeforums.net/general-c...se-forest.html |
Originally Posted by Koyote
(Post 20905067)
On this topic, google works just fine.
My point is that many questions have already been asked and answered about a thousand times. And I wouldn't go with this response if the OP didn't already have a history of this sort of thing. We're talking about an OP who recently started a thread asking for advice on how to take a crap in the woods...Apparently he keeps falling into his own s**t: https://www.bikeforums.net/general-c...se-forest.html I have a friend like that, he is a serial-asker (is that even a term?). He is a nice guy, just likes to ask questions, like a little kid. I just shrug my shoulders and answer him. He is otherwise a good guy. |
Originally Posted by eja_ bottecchia
(Post 20905096)
That’s funny.
I have a friend like that, he is a serial-asker (is that even a term?). He is a nice guy, just likes to ask questions, like a little kid. I just shrug my shoulders and answer him. He is otherwise a good guy. |
Originally Posted by Koyote
(Post 20905097)
I suppose I am intolerant, since I mastered defecation long before acquiring my first personal computer.
|
They are drilled to shed heat and water.
|
heat, water dissipation, weight reduction, & add a touch of sportiness to the cycle.
|
Originally Posted by Troul
(Post 20905186)
heat, water dissipation, weight reduction, & add a touch of sportiness to the cycle.
|
Originally Posted by bobwysiwyg
(Post 20905232)
Honda passed on the weight reduction and cool factor on my 1969 750. Lots of after market stuff to rectify both. ;)
|
The obvious answer is because it's made of Swiss cheese!
|
Originally Posted by Koyote
(Post 20905055)
Honest question: have you ever heard of google?
Surely you're not original in this either? |
Originally Posted by Doctor Morbius
(Post 20905279)
The obvious answer is because it's made of Swiss cheese!
|
One thing that is never discussed on BF: Are disc brakes superior to rim brakes?
|
Originally Posted by Koyote
(Post 20905067)
On this topic, google works just fine.
My point is that many questions have already been asked and answered about a thousand times. And I wouldn't go with this response if the OP didn't already have a history of this sort of thing. We're talking about an OP who recently started a thread asking for advice on how to take a crap in the woods...Apparently he keeps falling into his own s**t: https://www.bikeforums.net/general-c...se-forest.html Personally I try and make sure I've been to the loo before going out so I don't get caught short and I could never seriously ask something like that in a forum. One poster did suggest practicing squatting, and whilst personally I never plan on taking a dump in the woods, I may start practicing this in the garden just to see the look on the other halves face when she asks me what I'm doing :roflmao2: |
Originally Posted by Witterings
(Post 20905591)
Love it ... I just read the other thread .... virtually had tears rolling down my face I was laughing so much :lol
BTW...I really doesn't take much practice. During my last two two-week tours I had to use the woods a total of three times. I wear bibs, so I try to travel with full-zip jerseys. Makes things easier. |
Originally Posted by bobwysiwyg
(Post 20905232)
Honda passed on the weight reduction and cool factor on my 1969 750. Lots of after market stuff to rectify both. ;)
I had a 1978 CB750F, with 2 front discs with no holes. Still needed 4 fingers compared to later versions. Engineers of the time didn't want us to lock the front wheel, I guess. :p |
One of the OP's questions was is a solid rotor would give better stopping power
The answer is yes. It would create more friction with a solid surface and would give better stopping power..... ...until it got too hot. |
Originally Posted by Skipjacks
(Post 20905695)
One of the OP's questions was is a solid rotor would give better stopping power
The answer is yes. It would create more friction with a solid surface and would give better stopping power..... ...until it got too hot. |
Originally Posted by FiftySix
(Post 20905700)
So, for non-racers that don't use their brakes hard, solid discs would be fine. Except they'd weigh more and have no style. :o
It's not a matter of using the brakes hard. It's a matter of using them. You might be able to get away with a solid rotor in an ultra flat place where you're barely using them. But any kind of normal riding where you need to slow a decent down a hill and the drilled rotors will get hot enough that touching them will involve needing burn ointment at the least. No joke. They get pretty hot during normal usage. You won't make them glow red like you see on the 'brake cam' in NASCAR. But you'll make them dangerously hot to touch with anything other than a steady ride without using the brakes at all. |
How thick are bicycle discs?
If we assume that the holes are circular, for the surface area of a drilled disc to be larger than that of a solid disc, the following would need to be true: surface area of exposed material due to hole > surface area of the material that would be there if there was no hole 2*pi*r*th > 2*pi*r*r th > r Is that usually the case? What am I doing wrong? |
http://www.brembo.com/it/PublishingI...ogp/Ducati.JPG
How do those guys at Moto GP manage to not die while using discs without holes all over them? Behind the brakes: stopping power in MotoGP? | MotoGP? |
All times are GMT -6. The time now is 07:28 AM. |
Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.