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Why do they have holes in them?
Car discs don't, motorbike discs don't, aircraft discs don't. Why do bicycle discs have them? |
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On Thu, 16 Nov 2017 07:47:19 +0100, Tosspot
wrote: Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't. Why do bicycle discs have them? https://www.ebay.com/sch/Honda-Motor...i.html?_fsrp=1 https://www.boschautoparts.com/en/au...c-brake-rotors http://www.aerobrake.com/?gclid=EAIa... AEgLxKfD_BwE -- Cheers, John B. |
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On Thursday, November 16, 2017 at 7:47:23 AM UTC+1, Tosspot wrote:
Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't. Why do bicycle discs have them? Weight is my guess. Lou |
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On 11/16/2017 12:47 AM, Tosspot wrote:
Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't. Why do bicycle discs have them? Many do have slots or holes. Typical low-end auto discs have a center air channel. Our researcher discovered this by completely ignoring normal maintenance: http://www.yellowjersey.org/photosfr...t/NRCTDISC.JPG -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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On 16-11-17 14:43, AMuzi wrote:
On 11/16/2017 12:47 AM, Tosspot wrote: Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't.Â* Why do bicycle discs have them? Many do have slots or holes. Typical low-end auto discs have a center air channel. Our researcher discovered this by completely ignoring normal maintenance: http://www.yellowjersey.org/photosfr...t/NRCTDISC.JPG As a maybe related question: Why do bike discs allow for so little wear? The Shimano Ice-Tech discs are 1.8 mm thick, and need to replaced when they wear to 1.5 mm. Would there be an issue with cooling if they were thicker? Or, in the worst case, is this just a way for Shimano to sell more replacements? Ned |
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On 16-11-17 14:43, AMuzi wrote:
On 11/16/2017 12:47 AM, Tosspot wrote: Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't.* Why do bicycle discs have them? Many do have slots or holes. Typical low-end auto discs have a center air channel. Our researcher discovered this by completely ignoring normal maintenance: http://www.yellowjersey.org/photosfr...t/NRCTDISC.JPG As a maybe related question: Why do bike discs allow for so little wear? The Shimano Ice-Tech discs are 1.8 mm thick, and need to replaced when they wear to 1.5 mm. Would there be an issue with cooling if they were thicker? Or, in the worst case, is this just a way for Shimano to sell more replacements? Ned The thinner, the lighter. Thicker discs do not cool worse as heat dissipated is the same as the surface area. And replacement rate goes up. |
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wrote in message ... On Thursday, November 16, 2017 at 7:47:23 AM UTC+1, Tosspot wrote: Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't. Why do bicycle discs have them? Weight is my guess. Sometimes its about water clearance, but probably a "two birds with one stone" kind of thing. |
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"Tosspot" wrote in message ... Why do they have holes in them? Car discs don't, motorbike discs don't, aircraft discs don't. Why do bicycle discs have them? Damn - I was just seeking crowd funding for a start up in motorcycle disc locks. Vaguely remember seeing a car disc with holes - but can't remember where. its to a considerable extent, a trendy thing, and not many aircraft cruise past the girlies on the high street. Aircraft probably use cast iron discs because it works better and is lighter than stainless - and cast iron might be too brittle to make loads of holes in it. |
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Tosspot wrote:
:Why do they have holes in them? :Car discs don't, motorbike discs don't, aircraft discs don't. Why do :bicycle discs have them? Lots of high-performance car brake rotors are drilled or slotted. Slotting is more common on better stuff, holes can crack. They serve a couple of features. One, people think they're cool. two, they allow the gasses that come off brake pads somewhere to go (this is a non-issue with modern pads, but it was a problem in the dark ages). Three, they give water somewhere to go. Four, they improve cooling (increase surface area). five, the clean pads, and reduce wear. -- sig 127 |
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On Thursday, November 16, 2017 at 11:38:40 AM UTC-8, David Scheidt wrote:
Tosspot wrote: :Why do they have holes in them? :Car discs don't, motorbike discs don't, aircraft discs don't. Why do :bicycle discs have them? Lots of high-performance car brake rotors are drilled or slotted. Slotting is more common on better stuff, holes can crack. They serve a couple of features. One, people think they're cool. two, they allow the gasses that come off brake pads somewhere to go (this is a non-issue with modern pads, but it was a problem in the dark ages). Three, they give water somewhere to go. Four, they improve cooling (increase surface area). five, the clean pads, and reduce wear. BTW, I have found that flaming skulls work better than lizards or space aliens. https://ep1.pinkbike.org/p4pb5960033/p4pb5960033.jpg https://i.pinimg.com/736x/a8/a5/8f/a...2ba6b94a8f.jpg -- Jay Beattie. |
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