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#1
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Disc brakes, adaptors to increase rotor diameter
The adapters to increase rotor size in a post-post situation (which I
have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? -- Regards, Joerg http://www.analogconsultants.com/ |
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#2
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Disc brakes, adaptors to increase rotor diameter
On 2017-10-11 14:36, Joerg wrote:
The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? P.S.: Does anyone know whether these go from native 160mm to 203mm? https://erpimgs.idealhere.com/ImageF...963c864243.jpg F/R probably means for front and rear. There are also F203 versions but they look the same. Ideally I'd want 203mm rotors on both wheels because the rack on my MTB is often heavily loaded. -- Regards, Joerg http://www.analogconsultants.com/ |
#3
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Disc brakes, adaptors to increase rotor diameter
Joerg wrote:
The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? Probably because the axis along which the brake gets extended is not perpendicular to the outer surface of the disk, so as you slide the caliber outwards, you have to rotate it a bit to keep it tangential to the outer surface of the disk. |
#4
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Disc brakes, adaptors to increase rotor diameter
On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote:
The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? The angle of the caliper changes as you get into the larger rotor sizes and thus the disparity. http://www.bikehugger.com/posts/road...vs-post-mount/ The deal with adapters is that they usually assume the resident posts are sized for 160mm rotors. That is a correct assumption for your bike. My CAADX was, amazingly, sized for a 140mm front rotor, so my 180mm adapter was actually a 160mm adapter. -- Jay Beattie. |
#5
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Disc brakes, adaptors to increase rotor diameter
On Wed, 11 Oct 2017 18:16:20 -0700 (PDT), jbeattie
wrote: On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote: The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: If you keep following that logic, you'll have a disc diameter of 622 mm. Oh, wait.... |
#6
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Disc brakes, adaptors to increase rotor diameter
On 12/10/17 14:04, Tim McNamara wrote:
On Wed, 11 Oct 2017 18:16:20 -0700 (PDT), jbeattie wrote: On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote: The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: If you keep following that logic, you'll have a disc diameter of 622 mm. Oh, wait.... Haha. I thought that, but couldn't be bothered typing it. -- JS |
#7
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Disc brakes, adaptors to increase rotor diameter
On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote:
The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? Your first adapter is the normal one used on all rear brakes for cross bikes as far as I know. Putting larger disks on road bikes is sort of counter-productive since the problem with them already is excessive power. |
#8
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Disc brakes, adaptors to increase rotor diameter
On 2017-10-11 18:16, jbeattie wrote:
On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote: The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? The angle of the caliper changes as you get into the larger rotor sizes and thus the disparity. Understood. This is also what Ralph wrote. However, many calipers such as mine have round pads where it doesn't matter if the angle is slighlty different. http://www.bikehugger.com/posts/road...vs-post-mount/ The deal with adapters is that they usually assume the resident posts are sized for 160mm rotors. That is a correct assumption for your bike. My CAADX was, amazingly, sized for a 140mm front rotor, so my 180mm adapter was actually a 160mm adapter. My mounts are both native 160mm so ideally I'd like to go from there to 203mm without stacking two adapters. The front currently has a 160-180mm adapter and for whatever reason that one also adds angle. -- Regards, Joerg http://www.analogconsultants.com/ |
#9
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Disc brakes, adaptors to increase rotor diameter
On 2017-10-11 18:10, Ralph Barone wrote:
Joerg wrote: The adapters to increase rotor size in a post-post situation (which I have front and back) look like this: http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg My MTB has a factory one from 160 to 180mm up front but I am considering 203mm. That would make the thing even more extreme, like this where the screws would look more cattywompus or out of line than they already do: https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg Why are the spacings so different on both sides while for 160mm their are not? Probably because the axis along which the brake gets extended is not perpendicular to the outer surface of the disk, so as you slide the caliber outwards, you have to rotate it a bit to keep it tangential to the outer surface of the disk. I wonder if that's critical for round pads. The 160-180mm that was factory installed up front is angled but the calipers look like it wouldn't have mattered. -- Regards, Joerg http://www.analogconsultants.com/ |
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