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Shimano Disc Brake Adapters
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SM-MA-R160, IS/Post Rear$8.99![]()
SM-MA-R180, IS/Post Rear$8.99![]()
SM-MA-R203, IS/Post Rear$8.99![]()
SM-MA-F160, IS/Post Front$8.99![]()
SM-MA-F180, IS/Post Front$8.99![]()
SM-MA-F203 (160mm to 203mm), IS/Post Front$8.99![]()
SM-MA-F180, Post/Post Front/Rearsale $5.98![]()
SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear$8.99![]()
SM-MA-F180, IS/IS Front$12.99![]()
SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear$7.99
47 Reviews
Details
Adapt.
Whether you're trying to mount your 160mm rotor with an ISO or post-mount setup, we've got the right Shimano Disc Brake Adapters for the job. All you need is the skeleton key to understanding Shimano's admittedly byzantine model naming convention. SM-MA stands for Shimano Mount Adapter, so that'll be universal across models and can be safely ignored now that you're here.
The rest of the model name is the important part. An "F" denotes front brake and an "R" denotes rear brake. The following number (160, 180, or 203) is, of course, the rotor size, with special parentheticals for 203mm rotor conversion. The final two initials respectively describe the caliper type and the frame/fork mount type with either a "P" (post-mount) or an "S" (ISO). To alleviate confusion, we've reiterated the front or rear specification at the back.
To recap, model number SM-MA-F160, P/S Front is for the front brake (F), it accommodates a 160mm rotor (160), it holds a post-mount caliper (P), and it attaches to an ISO fork mount (/S).
- Durable alloy construction
- Mounting hardware included
- Compatible with ISO and post-mount calipers and frames/forks
- Item #SHI0108
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Tech Specs
- Reviews
- Q & A
What do you think about this product?
Have questions about this product?
Fit like a glove
- Familiarity: I've used it several times
The letter f will fit rear for p/p 180, if you are wondering. Needed an adaptor p/p on front and rear on my Niner jet 9 and was searching for letter designation for rear for 180mm p/p adaptor. Anyway fit like a glove. Love competitive cyclist, but you guys are going to have to step your game up in the shipping department. Way to slow!
jayYeti SB6
- Familiarity: I've put it through the wringer
Works on my 2016 Yeti SB6 with Fox 36 fork. Running 180 rotors front and rear. Bought 2 - SM-MA-F180, Post/Post Front/Rear. Running guide brakes.
Sunn KimEmployeeStop
With this, you can put bigger rotors on your bike, and stop faster.
Braydn TannerGearheadWorks great
- Familiarity: I've put it through the wringer
Tolerances are good, work great, and come with all the hardware you need. What more do you need?
Luke DordaiGearheadPurchased for my custom build on an SB6
Purchased for my custom build on a new Yeti SB 6, worked out perfectly!
SheilaEmployeeGets the Job Done, Nothing Flashy
- Familiarity: I've put it through the wringer
It is a brake adapter, if it allows my brakes to function properly without rub it is a 5 star in my book.
Matthew KielEmployeeMake your rotors fit your frame
This simple piece of metal makes it possible for you to reach unprecedented speeds biking, and come back alive. simply select the version you need, attach it to your frame and caliper, and magically when you squeeze the lever on your bar, you will begin to slow down. Amazing.
Braydn TannerGearheadgo big, go bigger
- Familiarity: I've put it through the wringer
Built a Jones bike recently and JeffJ advocates 203mm rotors up front, 180mm in back. Needed the appropriate adapters to get the discs around those big rotors. Mounted quickly, adjusted appropriately. Worked perfect.
Josh RGearheadWorking great
They work as expected
kguillenEmployeeMaking brakes and rotor get along
- Familiarity: I've put it through the wringer
So you got new brakes and rotors, awesome! Now you need to make everything play nice. There are a number of different adapters to go from all the different rotor sizes and mounting standards. You can look up what you need or ask a bike CS rep, but if you're rocking Shimano brake set up, these will have the peace maker for your bike.
Dane H.Choose the Right
- Familiarity: I've used it several times
Necessary part for bikes with rotors 140 plus. Just make sure you select the correct model and don't trust our photos to be the exact sub-model. Feel free to call us with any questions at 1-888-276-7130 for parts questions.
Sean Zimmerman-WallGearheadFox 36 YES
- Familiarity: I've put it through the wringer
Finally, a cheap solution to mounting my 203mm rotor to my Fox 36 perfectly. Couldn't believe Fox wanted $35 for the 180mm to 203mm P/P adapter. I love their stuff but come on. Shimano for the win
SDKennethHelps in slowing down.
- Familiarity: I've used it several times
Changed a rotor and needed this to make things work. Easy install and now I'm good to go. Or stop... Whatever...
Dave WatsonEmployeeEasy to install
- Familiarity: I've put it through the wringer
I would use these for Sram or shimano brakes. Work the best for either option and they are super easy to install brakes with.
Joe BoltonGearheadWell Made
Spend some time making sure you grab the right one. Well made and fits great!
EmmaEmployeeMake my brakes work
- Familiarity: I've put it through the wringer
Must need for most disc brake calipers to fit whatever rotors you are running.
Andrew DickinsonGearheadGotta Have It
- Familiarity: I've put it through the wringer
Cracking the Shimano-speak code to figure out which one you need is the hardest part. Once you have the right one, it's easy to install, and does what it needs to do. Never had an issue with any of these that I've used.
Hap SeligaGreat Adapter
- Familiarity: I've put it through the wringer
This is a great adapter for disc brakes. Find which one you need and get it. These adapters keep your caliper where you need it with little flex.
Marc DiVallGearheadHolds my calipers
- Familiarity: I've put it through the wringer
keeps muh alipers from fallin off mai byke!!
Colton RiceEmployeePick the right one
These are idiotproof, assuming you can decipher Shimano's compatibility code. Read the description and pick what you need, don't forget you need a front and rear!
Steve SimpsonI want to put a 203mm rotor on a rock shox pike using SRAM guide RSC brakes. What is the model of adapter I need.
Thanks,
R
Ryan H.i have a 2017 yeti sb6 and sram guide rs brakes with 180mm rear rotors now, is this the brake adaptor i need to use sram's centerline 200mm rotors in the rear? there's currently an adaptor installed
Robert L.I have a realm beach cruser from the 60s it comes stock with springer forks I would like to put a disc brake on the front is there a adapter that will work on the springer forks for a disc brake. I'm about ready to give up and go for a drum brake. Thanks
don klinefelterI have a 2011 Specialized Stumpjumper 29er HT with RockShox Reba RL 29, 9mm-travel w/lockout (15.5": 80mm travel and I am hoping to install the Shimano XT SM-RT86 6-Bolt Disc Brake Rotor (180mm) on the front. I do not know which mounting bracket I need? Can you please help me? I really appreciate it.
Thank You.
Austin Blasingame
austin blasingameI have a Mach 5.7 pivot with fox float fit Tlc up front what brake adapters would I need to go to 160 in back and 180 up front
Stewart S.Looking to put xtr 9000s on cannondale XLR carbon 90 Lefty, it had 180/160 rotors front & rear respectively. replacing XO brakes, what mounts do I need?
Jim D.I have a Mach 5.7 pivot with fox float fit Tlc up front what brake adapters would I need to go to 160 in back and 180 up front
Stewart S.Following the formula outlined above I need an SM-MA-R180 P/P but don't see that as an available option for ordering. Does running that setup not require an adapter?
DanWhich adapter do I need for the rear brake on a Santa Cruz Bronson Frame? Using XT Brakes.
Lloyd C.I have done some homework on your disk brake adapter question, and you will have to use item “SM-MA-F160,P/S”. If you have any additional questions, please feel free to call or email me at dmyers@backcountry.com
Don MyersGearheadWhat type of rear caliper mount type do I need for 2014 Niner EMD 9, is it ISO, P/S or P/P)? Also, what type of front caliper mount type do I need for RockShox Reba RLT with 15mm thru axle (P/P or P/S)? Thanks in advance.
jason_abarientos@yahoo.comHello, On this particular frame for the rear you would need a P/S adapter and on the front you would need a P/P adapter.
Thank You.
Conner VIs there a rear Post to Post adapter for...
Is there a rear Post to Post adapter for shimano brakes with 180 mm rotor?
Les S.The post to post 180mm mount for the front, will work on the rear.
Jeff C.is there a rear disc convertion or a non...
is there a rear disc convertion or a non disc bike
david sculleyYes 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
Eric PorterPro AthleteI noticed all options above include IS...
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!!
mr. TI 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
Dan HallWell 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.
mr. TWhich adapter do I use for post mount rear...
Which adapter do I use for post mount rear frame tabs (new Turner have PM rear instead of 51mm IS)
John DevineChoose 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.
Damon SalterStandard 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.
Dan HallI'm comfused, the item # shi0108 fits in...
I'm comfused, the item # shi0108 fits in a post mount fork with IS caliper and 160 mm rotor?
frsanchezp2217797-0this 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.
Jeff MikaelianGearheadthe 180 rear adaptor will fit the 170mm...
the 180 rear adaptor will fit the 170mm rotor?
KYLIE.PJust 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?
KC Gaudet☃bcs_badge_alumni_label☃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.
mr. T