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SRAMPost Mount Brake Adapter


Item # SRMD114

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  • Black, 10mm, Post Mount ($25.00)
  • Black, 20mm, Post Mount ($25.00)
  • Black, 30mm, Post Mount ($25.00)
  • Black, 40mm, Post Mount ($25.00)
  • Rainbow, 20mm, Post Mount ($25.00)
  • Rainbow, 40mm, Post Mount ($25.00)
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Item # SRMD114

Why We Like The SRAM Post Mount Brake Adapter

We’ve been there with you, trying to up our game on the descents just to find we need bigger brake rotors to make it happen. Whether we need to go from a 160mm to a 180mm or a 200mm to 220mm rotor these post-mount adapters will work with any post-mount caliper front or rear and include all the mounting hardware to install them. These adapters from SRAM even come pre-coated with a blue thread locker so our brakes don’t rattle loose down the next black-diamond send.

  • Spaces post-mount calipers to fit different sized rotors
  • Option for ti-inspired ‘rainbow’ fixing bolts for extra style
  • Compatible with most post-mount brake calipers

Tech Specs
Material[adapter] aluminum, [hardware] stainless steel
Attachment Typepost-mount
Compatibilitypost-mount disc brake calipers, post-mount frames and forks
Recommended Usemountain biking, cycling
Manufacturer Warranty2 years

Actual Weight

Black, 10mm, Post Mount
Black, 20mm, Post Mount
Black, 30mm, Post Mount
Black, 40mm, Post Mount
Rainbow, 20mm, Post Mount
Rainbow, 40mm, Post Mount

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?


>Rating: 4

40mm post adapters

I've used it several times
True to size
Size Bought
6` 1"
210 lbs

Worked as they should. Easy install but did need shorter bolts to switch from current adapters to these. Sourced stainless steel at local hardware store for a few bucks and was on my way.

>Rating: 5

* Explained* Photo Issue Black 20mm Post

I've put it through the wringer

Thanks for the feedback everyone Just clarifying the image issue on this product in regards to the variant "Black 20mm Post Mount" Please Note - Performance will be the same! ---You will receive a spacer kit that looks like the photo I have attached below. There is an image issue and you are being displayed the incorrect item.--- Also, here is an attached guide for install. ***REFER To the "POST MOUNT" Image*** https://www.servicearchive.sram.com/sites/default/files/techdocs/95-5018-000-000_rev_b_disc_brake_caliper_mounting.pdf


so is this an add on to the existing post mount if you're upgrading from 200 to 220 rotors?

>Rating: 3

Confusing if you've never used before

My biggest gripe is that there is no instructions. Shouldn't be a big deal, it's just a brake adapter right? Having never done this before, I was expecting a simple spacer and a pair of washers and bolts. What I received was two bags of bolts each with different sized spacers. These are my brakes so I didn't want to figure it out through trial and error. After an hour searching on the web, I finally found the instructions (see below). Everything was pretty simple once I had the instructions, but they should have either included the two pages with the product or at least a link to help easily find them online! My second gripe is that it's ugly. I expected the clean brace looking one that I have on another bike, but per the instructions, that's OEM only for the 20mm spacer. Instead I have this bucket of bolts and spacers that looks like a hardware store DYI job. For anyone with my setup here are the cliff notes for a Yeti sb130 going from stock 180mm to 200mm with SRAM guide brakes: Use the parts in the bag marked standard. Longer spacer (12.5mm) and bolt (37.5mm) are used to mount the upper hole (where the brake hose connects) and shorter spacer (7.5mm) and bolt (32mm) are used for the lower hole (furthest from brake hose). SRAM Adapter Instructions: https://www.servicearchive.sram.com/sites/default/files/techdocs/95-5018-000-000_rev_b_disc_brake_caliper_mounting.pdf


Thank you William for the feedback. We have notified our teams to get this sorted out. Please reach out if you have any questions you may have.


If I'm running a 200mm rotor in the front and 180 mm in the rear, will this bracket fit both front and back? I have the sram code r for my brakes. And if so, which adapter should fit? Thanks.

>Rating: 4

Needed Items for Rotor Upgrade

My 2019 Santa Cruz Bronson V3 is the bomb! For my style of riding, it fits all my needs. In comparison to SRAM's Guide RSC brakes, the Codes are definitely better with lots of pucker power. Wanting more braking power, I decided to upgrade my rear rotor from to 200mm. It was obvious I needed 20mm to accommodate the larger rotor. To my disbelief, SRAM didn't include any instructions with the kit. Rather than seeing spacers of equaling 20 mm, the kit came with two separately sealed packets of spacers and washers. In each separate packet was a common 12.5mm spacer. But the separate packets also included a 7.5mm and 17.5mm spacer. Ok, I get it; not all bikes are manufactured the same. I emailed SRAM whether my assumptions about its fit were correct (Using spacers that align the caliper/brake pads to the larger rotor) To this day, SRAM still hasn't responded. (I also wrote to Santa Cruz and they didn't answer either). At any rate I chatted with a CC rep and he provided clarity on its mounting use. After mix and matching the spacers, I was able to align the brake pads to the rotor. Although 20mm doesn't seem like much, the difference in stopping power was instantly recognizable. Now I'm able to hit those steep and gnarly trails with a lot more confidence. Amazing! From CC's standpoint, they get 5 stars from me! However from SRAM's viewpoint, they get 4 stars due to their lack of instructions and responding to customer inquiries. If you're thinking of upgrading your SRAM/Avid rotors, this is the kit to buy. But beware: It doesn't come with mounting instructions. So you'll need to mix and match the spacers to determine which best aligns to the rotor.

SO what combination did you use? My rear is flat mounting at 160mm and going to 180mm with same kit.