Like much of life, making your Shimano disc brakes work with your 160mm rotor is easy --once you learn how to figure out which adapter you need. Whatever you have, we can either sell you the adapters to make it work, or tell you that what you have is enough.
You need to know three things -- what kind of mount your Shimano disc caliper is, International Standard (ISO) or post mount. If it goes on the front, you need to know what your fork is: ISO, post-mount, or a few special cases (Marzocchi 20mm axle, Boxxer-type). And, you need to know the rotor size that you're trying to fit -- in this case, it's 160mm.
If you're trying to diagnose what you already have and/or what you need, here's how to do it. The Shimano adapters all have a model number that starts with SM. The Mount Adapter acronym is MA. Front brake is F. Rear brake is R. Rotor Size is 140, 160, 180, or 203. Caliper Mount Type will be S for ISO/International A, and P will represent Post. And the last letter will be for the frame or fork mount type: S for ISO/A, P for Post, B for Boxxer, Z for Marzocchi 20mm Axle as well as QR20Plus and DH ISO. Thus an adapter that reads SM-MA-F-203S/P is Shimano Small Parts Mount Adapter Front 203mm Rotor with ISO caliper on a Post type fork.
With the first drop down box, please select the mount that corresponds with the fork or frame you are using. With the second drop down box, please select the type of caliper you have -- Post or International Standard (ISO).
Terms And Conditions
This Usage Agreement (the "Agreement") governs your conduct while using various services on the web site Backcountry.com and its affiliate web sites (collectively, the "Site"). All references to "we," "us," and "our" shall mean Backcountry.com and all references to "you" and "your" shall mean the user of the Site and Site Services. This Agreement applies to various services and activities on the Site as well as to gear review and product ratings (collectively, "Site Services"). Please read this Agreement carefully.
BY ACCESSING, BROWSING, AND USING THE SITE, ANY SITE SERVICES AND OTHER SERVICES THEREIN, YOU AGREE TO BE BOUND BY THIS AGREEMENT AND ITS TERMS. IF YOU DO NOT AGREE TO THIS AGREEMENT OR ANY SUBSEQUENT MODIFICATION THEREOF, DO NOT ACCESS, BROWSE OR OTHERWISE USE THE SITE OR SITE SERVICES, INCLUDING THE SUBMISSION OF ANY REVIEWS OR COMMENTS.
Your use of the Site is governed by this Agreement and any other agreements and/or terms of use adopted by Backcountry.com and/or its affiliates. This Agreement shall govern in the event of, and to the extent of, any inconsistency with the Site. For more information on our privacy practices, read the Privacy Policy to understand our practices regarding the collection, use and disclosure of personal information on the Site and with respect to Site Services.
Any comments, reviews (including gear reviews and product ratings), posts, feedback, questions, answers, notes, messages, images, video, audio, materials, documents, data, graphics, ideas, suggestions or other communications (collectively, "User Content") you submit on the Site are not private or proprietary. By submitting User Content on or through the Site, you grant, assign and transfer to Backcountry.com all of your rights, title and interest, including without limitation, all intellectual property rights and moral rights, in and to such User Content. To the extent the preceding assignment and transfer is ineffective, you hereby grant Backcountry.com an irrevocable, royalty-free, worldwide, perpetual right and license to use, copy, modify, adapt, display, publish, archive, store, distribute, reproduce and create derivative works based upon such User Content, in any form, media, software or technology of any kind now existing or developed in the future.
By submitting such User Content on or through the Site, you are confirming that (a) you are the sole author of the User Content and the User Content originated with you and not copied in whole or in part from any other work; (b) you have obtained all necessary permissions associated with the User Content, including without limitation permissions relating to copyrights, trademarks, rights of publicity and/or rights of privacy; (c) the User Content does not contain hate speech or profanity and is not unlawful, threatening, abusive, harassing, tortuous, defamatory, vulgar, libelous, obscene, racially, ethnically or otherwise objectionable, an invasion of another's privacy, or otherwise in violation of this Agreement; (d) that you are not a minor and have the legal right and capacity to enter into and comply with this Agreement; (e) such User Content does not and will not, in any way, violate or breach any of the terms of this Agreement; and (f) Backcountry.com shall not in any circumstances be required to pay or incur any sums to any person or entity as a result of its use or exploitation of the User Content.
With respect to your conduct on the Site or while using the Site Services, you agree not to: (a) attempt to disguise the origin of any User Content transmitted to the Site Services whether through the Site or any third party site; (b) act in any manner that negatively affects other users' ability to use the Site and Site Services; (c) impersonate any person or entity, including without limitation, a manufacturer or owner of any product, or falsely state or otherwise misrepresent your affiliation with a person or entity; (d) interfere with the Site or Site Services, or servers or networks connected to the Site or Site Services, or disobey any requirements, procedures, policies, or regulations of networks connected to the Site or Site Services; (e) upload, post, or otherwise transmit any User Content that with respect to the Site Services: (i) is not relevant to the product, service, person or entity being reviewed; (ii) you do not have a right to transmit under any law or under contractual or fiduciary relationships (by way of example but not limitation, inside information, proprietary and confidential information learned or disclosed as part of employment relationships or under nondisclosure agreements); (iii) contains software viruses or any other computer code, files or programs designed to interrupt, destroy or limit the functionality of any computer software or hardware or telecommunications equipment; or (iv) is unsolicited or unauthorized advertising, promotional materials, "junk mail," "spam," "chain letters," "pyramid schemes," or any other form of solicitation.
By submitting any such User Content on or through the Site, you grant Backcountry.com permission to use your name, alias and any other information (as provided by you) to attribute such User Content to you. Without limiting the generality of the previous sentence, and subject to our Privacy Policy, you authorize Backcountry.com, its affiliates, and sublicensees to share the User Content across all affiliated Web sites, and to use your name and any other information in connection with its use of such User Content, as they may choose. You also grant Backcountry.com and its affiliates the right to use any material, information, ideas, concepts, know-how or techniques contained in such User Content. We are not responsible for the similarity of any of our Content or programming in any media to User Content submitted by you. Any and all rights granted in this section are granted without the need for any compensation to you in any form.
User Content does not reflect the views of Backcountry.com, and Backcountry.com does not represent or guarantee the truthfulness, accuracy, completeness, timeliness, integrity, quality or reliability of any User Content, nor does Backcountry.com endorse or support any opinions expressed in any User Content. In no event shall Backcountry.com have or be construed to have any responsibility or liability for or in connection with any User Content, Any gear reviews and/or product ratings submitted on the Site, if displayed, are displayed for entertainment and informational purposes only. Under no circumstances will Backcountry.com be liable in any way for any User Content, including but not limited to, any errors or omissions in any User Content, or for any loss or damage of any kind incurred as a result of the use of any User Content posted, emailed or otherwise transmitted via the Site or Site Services.
If Backcountry.com determines, in our sole and absolute discretion, that you or any User Content you submit violates this Agreement, we reserve the right, at any time, without notice and without limiting any and all other rights Backcountry.com may have under this Agreement, to: (a) refuse to allow you to submit further User Content; (b) remove and delete your User Content; (c) revoke your registration and right to use the User Content Submission Features; and (d) use any technological, legal, operational or other means available to enforce the terms of this Agreement, including, without limitation, blocking specific IP addresses or deactivating your registration, access to the Site and Site Services using your e-mail address, and your user name and password. Without limiting the foregoing, once User Content is submitted to the Site, Backcountry.com may take any or no action with respect to such User Content, including without limitation, deleting, editing, modifying, rejecting, or refusing to post such User Content, but is under no obligation to offer you the opportunity to edit, delete or otherwise modify User Content once it has been submitted. Backcountry.com shall have no duty to attribute authorship of User Content to you and shall not be obligated to enforce any form of attribution by third parties.
If, despite the foregoing assignment and transfer of rights in the User Content, it is determined that you retain moral rights (including the rights of attribution or integrity) in the User Content, you hereby declare that: (a) you do not require that any personally identifying information be used in connection with the User Content or any derivative works of or upgrades or updates thereto; (b) you have no objection to the publication, use, modification, deletion and exploitation of the User Content by Backcountry.com or its licensees, successors or assigns; (c) you forever waive and agree not to claim or assert any entitlement to any and all moral rights of an author in any of the User Content; and (d) you forever release Backcountry.com, and its licensees, successors and assigns from any claims that you could otherwise assert against Backcountry.com by virtue of any such moral rights.
You are prohibited from violating the security of any system or network compromising the Site or the Site Services, including but not limited to the following: (a) unauthorized access to or use of data, systems, or networks, including any attempt to probe, scan or test the vulnerability of the Site or Site Services or to breach security or authentication measures; (b) unauthorized monitoring of data or traffic on the Site or of the Site Services; (c) interference with the Site or Site Services including without limitation, any type of flooding technique or deliberate attempt to overload the system such as denial or service attacks; (d) forging of a message header or any part of a message header; or (e) using manual or electronic means to avoid any use or access limitation placed on this Site or the Site Services. Such violations may result in criminal or civil liability.
Backcountry.com reserves the right to report any activity or persons that Backcountry.com suspects has violated any law or regulation to appropriate law enforcement officials, regulators, or other appropriate third parties (including the disclosure of appropriate subscriber information). Backcountry.com may also cooperate with appropriate law enforcement agencies to assist in the investigation and prosecution of any illegal conduct. Indirect or attempted violations of this Agreement and actual or attempted violations thereof by a third party on behalf of any user shall be considered violations of this Agreement by such user.
BACKCOUNTRY.COM DOES NOT ENDORSE THE USER CONTENT, IS NOT RESPONSIBLE FOR THE USER CONTENT AND SPECIFICALLY DISCLAIMS ANY RESPONSIBILITY OR LIABILITY TO ANY PERSON OR ENTITY (INCLUDING, WITHOUT LIMITATION, PERSONS WHO MAY USE OR RELY ON SUCH USER CONTENT) FOR ANY LOSS, DAMAGE (WHETHER ACTUAL, CONSEQUENTIAL, PUNITIVE OR OTHERWISE), INJURY, CLAIM, LIABILITY OR OTHER CAUSE OF ANY KIND OR CHARACTER BASED UPON OR RESULTING FROM ANY USER CONTENT PROVIDED THROUGH THIS WEB SITE.
Share your thoughts
What do you think of the
Shimano Disc Brake Adapters
? Share a...
Works Perfectly with Shimano Saint
Chad Cordell
Member since
I bought this to match up a 203 rotor on a Fox 40 and it works perfectly. If you are using Shimano brakes this is a must have.
is there a rear disc convertion or a non...
david sculley
Member since
is there a rear disc convertion or a non disc bike
Eric Porter
Member since
Yes there is. Upgrading your frame to a new one with built in brake mounts is your best choice, but if that isn't an option, you can try this! http://2btherapy.com/bikes/brake-therapy-conversion-kit
Cheap!!
nakedshoe2068988
Member since
Works great! tried other styles, and Shimano is the best!
I noticed all options above include IS...
mr. T
Member since
I noticed all options above include IS attachment, EXCEPT the pic of the "203 front" which appears as a post mount adapter for 8" remaining 74mm; such as all new shimano brakes are.
BIG QUESTION: if I order the 203 front will I receive the 74 to 74mm, and excuse the IS designation (the photo goes with this selection, i believe). Thanks!!
dan hall
Member since
I pitty da foo...
I would not excuse the designation. Probably sold out of the 74-2-74 mounts. If it says IS it most likely is
mr. T
Member since
Well pitty putty-
I'll be the eternal optimist; six designations, six pics, and one is P/P, good for the return at least and a damn good price as a generic adapter for all the mutts out there.
Which adapter do I use for post mount rear...
John Devine
Member since
Which adapter do I use for post mount rear frame tabs (new Turner have PM rear instead of 51mm IS)
Damon Salter
Member since
Choose the Rear IS Frame for the size of rotor you are running. So all three will work but if you are running 160mm rotors get the 160 adapter.
dan hall
Member since
Standard Avid and Shimano post mount brakes will not need an adapter for 160mm rotors. Use one of them. You should not be able to run IS mount rear calipers on this frame. There maybe an adapter - but the rotors will have to be bigger - 203mm witch most likely will not fit the frame.
Not just Shimano...
groovystru2196892
Member since
these work for Hayes Stroker Trails with 7" rotors on a Fox 32RLC with the IS mount.
I'm comfused, the item # shi0108 fits in...
frsanchezp2217797
Member since
I'm comfused, the item # shi0108 fits in a post mount fork with IS caliper and 160 mm rotor?
Jeff Mikaelian
Member since
this adapter is to convert the post style mounts to shimano style mounts. If you have a 160 mm rotor, choose the Front 160. Or get a new fork.
the 180 rear adaptor will fit the 170mm...
KYLIE.P
Member since
the 180 rear adaptor will fit the 170mm rotor?
KC Gaudet
Member since
Just a guess here, but that doesn't seem like it would be the hot set up. It would probably sorta work, but since the 180 adapter sets the caliper further from the axle, I think the pads might not get full contact with the rotor. The result of that would be poor braking and uneven/fast pad wear. What 170mm rotor are you rocking? Magura?
mr. T
Member since
Brake track is very crucial, so caliper placement is important. 5mm shims may work on a 160 setup- if you can't find the correct adapter which I suggest.

Eric Porter
Member since