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PostPosted: Fri Jul 29, 2011 1:10 am 
Old School Hero
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Joined: Sun Mar 27, 2011 2:09 am
Posts: 235
Location: Hull, Humberside
DISK BRAKE CALIPER MOUNTS Can be confusing for some, why have two standards? Anyway on with relevant details.

TWO TYPES: POST MOUNT & I.S. MOUNT

The disc caliper screws to the mount, and in many instances with a caliper adaptor specific to the MOUNT TYPE, ROTOR SIZE and BRAKE MANUFACTURER.

The caliper adaptor MAY NOT come supplied with your purchased BRAKE SYSTEM, so check first as adaptors are £10+ each

Something worth mentioning about the direct mounting of POST MOUNT, if you cross thread your fork/frame internal threads within the POST MOUNT, then you're knackered!

If you thread your I.S. MOUNT caliper adaptor bracket, "Like it matters", because the adaptor are relatively cheap at about £10, alot cheaper then a new frame or fork for knackered POST MOUNTS!

CALIPER MOUNT ADAPTORS
http://www.chainreactioncycles.com/Cate ... goryID=563

Image

CALIPER ADAPTOR
Larger discs then 160mm will need different CALIPER DISK ADAPTORS (Specific to the brake manufacturer, eg Avid), so that CALIPER will sit the correct distance from the ROTOR.
Also some caliper come without an adaptor POST MOUNT style, hence an adaptor POST MOUNT to IS MOUNT (Or POST MOUNT 160mm to larger 180mm or 200m) is needed for the correct ROTOR SIZE (Eg 160mm, 180mm, 200mm)

POST MOUNT to IS MOUNT (COMMON/STANDARD CALIPER ADAPTOR). FIT CALIPER to IS MOUNT
Image

POST MOUNT to LARGER POST MOUNT (LESS COMMON/STANDARD CALIPER ADAPTOR). FIT CALIPER to POST MOUNT accomodating larger size ROTOR/DISC Image

POST MOUNT
Image

Image
http://www.hayesdiscbrake.com/wp-conten ... -Mount.pdf

I.S. MOUNT (I.S. = INTERNATIONAL STANDARD)
Image

FRONT IS
http://www.hayesdiscbrake.com/wp-conten ... ont-IS.pdf
Image

REAR IS
http://www.hayesdiscbrake.com/wp-conten ... ear-IS.pdf
Image

Q. How / who established the i.s. (international standard) & post mount, for disk caliper mounts?

The only caliper mounting standard reference I can find on this, is this:
http://en.wikipedia.org/wiki/Bicycle_br ... _standards

But it doesn't say who, presume Shimano, or a frame/fork manufacturer, or another business/organisation/person?

I guess Shimano met with makers of mtb's, frames & forks (Instead of the other way round, ie frame makers saying we put caliper mounts here on our frames, so please make hubs and calipers to fit! Obviously Shimano is the biggest groupset manufacturer they must have significant influence on the mtb and to a lesser extent the front suspension makers.

Especially since Shimano manufacture their own, and have done so for many years:
~ Hubs & Rotors/Discs which are bolted to each other, and
~ Calipers which are bolted to the frame/fork.


Last edited by srands on Sun Aug 28, 2011 6:29 pm, edited 6 times in total.

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PostPosted: Fri Jul 29, 2011 8:23 am 
Retro Guru
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Joined: Fri Sep 19, 2008 4:37 pm
Posts: 5198
Location: North West
You missed out on pictures :shock: :lol:

Image

My forks are post mount but I only have a picture from the front ...

WD :D


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PostPosted: Fri Jul 29, 2011 11:06 am 
Retro Guru

Joined: Tue May 06, 2008 4:24 am
Posts: 713
Location: Edinburgh
the callipers are post mount you fit an adaptor to make it I.S mount, so i would say frame manufacturers decided rather than component manufacturers


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