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Disc Brake mounting adapters..

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Disc Brake mounting adapters..

Old 06-19-11, 03:05 PM
  #1  
fietsbob
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Disc Brake mounting adapters..

Seems to me, .. since there is a standard post mount hole spacing
on most disc calipers ,
and the ISO is a second 'standard' where the holes are at 90 degrees
to the post mount.

are there any exceptions to using any adapter for a given disc diameter,
with any brake caliper? ,

or have there been brand specific specs that are not obvious.. ?
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Old 06-20-11, 06:01 AM
  #2  
dabac
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Originally Posted by fietsbob View Post
Seems to me, .. since there is a standard post mount hole spacing
on most disc calipers ,
and the ISO is a second 'standard' where the holes are at 90 degrees
to the post mount.

are there any exceptions to using any adapter for a given disc diameter,
with any brake caliper? ,

or have there been brand specific specs that are not obvious.. ?
Good questions, and I'd love to have a few solid answers myself.

One trap that I've found out about:
- an IS mount adaptor for a 160 mm front = a 140 mm rear rotor. I'm guessing the same 20 mm difference front/rear will stay true across the range.
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Old 06-20-11, 08:24 AM
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I got that Part, its the cross brand names compatibility, that is my question..
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Old 06-20-11, 11:09 AM
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There were some oddball mounts back when the disc brakes first became popular. Hope had their own as I recall. A flat "platform" which the caliper mounted onto.

Then along came the post mount for front forks. From Hayes? Around the same time the original IS mounts for the rear and for forks also came out but again it was a company specific mount at first. But enough bought into that format that it became the IS mounts we have now.

The odd thing is that the post mount format is still with us. Hayes, Avid, Shimano and likely Magura all have calipers with adapters on them for IS mounting. But take off the adapter and the calipers fit directly onto the rare but still seen post mount forks with no adpater needed unless you want to use a disc larger than 160mm. But because the calipers are all originally done to the post mount standard and the adapters fit the IS mount standard it means that adapter brands should all be cross compatible. Wellllll,,,, Avid has the funky cup and ball washer alignment system now. If they moved the post mount ears out a little then their adapters are cross compatible. If they sized the adpaters to allow for the cup and ball sets then they won't be.

Oddly I don't recall ever seeing any post mount frames. Just forks. Frames have, I'm pretty sure, all been IS style with an adapter. So the adapters were with us right from the start.

Not sure if this history lesson answered your question or not.

Last edited by BCRider; 06-20-11 at 11:13 AM.
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Old 06-21-11, 02:42 AM
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Originally Posted by BCRider View Post
Oddly I don't recall ever seeing any post mount frames. Just forks. Frames have, I'm pretty sure, all been IS style with an adapter. So the adapters were with us right from the start.
Post mount frames are now being made by Giant, Canyon, Focus, Cube, BMC, Turner, Morewood, Merida, Ibis, Salsa, Specialized and probably a few other companies too.
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Old 06-21-11, 09:52 AM
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Cobba, you may be right but I'm not seeing any post mount frames from checking a couple of those names. Salsa's Mariachi Ti cross country bike would be one that I would expect to use a post mount if any were going to so as to eliminate the weight of an adapter. But it's IS as are the 8 or 9 other frames I looked at from other companies in a quick search for a post mount frame. I'll happily say "attaboy" and bow to you if you can show me a picture of a post mount frame.
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Old 06-21-11, 12:18 PM
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You mustn't of been looking at the right ones.

Focus: https://www.focus-bikes.com/de/en/tec...postmount.html

Canyon: https://www.canyon.com/_en/mountainbi...ke.html?b=2152
https://www.canyon.com/_en/mountainbi...ke.html?b=2150
https://www.canyon.com/_en/mountainbi...ke.html?b=2149
https://www.canyon.com/_en/mountainbi...ke.html?b=2148
https://www.canyon.com/_en/mountainbi...ke.html?b=2147
https://www.canyon.com/_en/mountainbi...ke.html?b=2145
https://www.canyon.com/_en/mountainbi...ke.html?b=2144

Giant: https://www.giant-bicycles.com/en-US/....1/7508/44088/
https://www.giant-bicycles.com/en-US/...x1/7321/44095/
https://www.giant-bicycles.com/en-US/...12/8901/48585/
https://www.giant-bicycles.com/en-US/...et/7321/44750/

BMC: https://www.bmc-racing.com/ch-de/bike.../standard.html
https://www.bmc-racing.com/ch-de/bike...-2012/xtr.html
https://www.bmc-racing.com/ch-de/bike.../standard.html
https://www.bmc-racing.com/ch-de/bike.../standard.html
https://www.bmc-racing.com/ch-de/bike.../standard.html
https://www.bmc-racing.com/ch-en/bike...?switch=1.html
https://www.bmc-racing.com/ch-de/bike.../standard.html

Specialized Epic's: https://www.specialized.com/us/en/bc/...nuItemId=15153

Cube: https://www.cube.eu/en/cube-bikes/
All the Hardtails and some of the Tour bikes.

Turner: https://www.turnerbikes.com/011/index.html
All models

Ibis: https://www.ibiscycles.com/bikes/mojo_hd/
https://www.ibiscycles.com/bikes/mojo_sl-r/

Morewood: https://www.morewoodbikes.com/
Downhill, All Mountain & Freeride models.

Salsa: https://salsacycles.com/bikes/vaya/
They made others in the past: https://salsacycles.com/bikes/el_kaboing/
https://salsacycles.com/bikes/big_mama/
https://salsacycles.com/bikes/archived_fargo/

Merida: https://www.merida.com.au/en_int/bike...NE+Lite+1800-D
https://www.merida-bikes.com/en_int/b.../O.NINE+Team-D
https://www.merida.com.au/en_int/bike...candium+3000-D
Theres' probably a few others too.

Simplon:
All hardtails except the Zion: https://www.simplon.com/mountainbikes/hardtails.html
Stomp & Dozer full suspension: https://www.simplon.com/mountainbikes/hardtails.html

Bianchi:
Methanol & Jab: https://www.bianchi.com/au/Bikes/Bike...IDMaster=52811

Last edited by cobba; 06-21-11 at 01:49 PM.
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Old 06-21-11, 12:26 PM
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any left side rear detail photos ?
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Old 06-21-11, 12:37 PM
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Some links have good photos from the left side and rear, some links have photos that you can rotate and zoom in, some links just have a zoom from the RH side.

BMC, Canyon and Turner probably have the best photos.

Some frames have a removable insert that can be replaced if the threads get stripped.

Last edited by cobba; 06-21-11 at 12:42 PM.
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Old 06-21-11, 01:19 PM
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fietsbob
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anyhow back to the post mount to ISO tab, adapter
& cross brand interchangeability ..

such is on my spinner produced fork and Rohloff sliding dropout.
neither are post mount.

magura and avid mix and match?

Last edited by fietsbob; 06-21-11 at 01:22 PM.
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