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Shimano MA-90 Disc Brake Mounting Bracket

4.5 4.5 out of 5 stars 412 ratings

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About this item

  • Fits post mount brake to IS mount fork.
  • Machined window for lighter weight
  • Includes bolts
  • Shimano Reference Number: MA-90-R-140 P/S

Product Description

Shimano alloy brake adaptors to fit your specific brake caliper to a specific fork. Now even lighter with more machine work to decrease weight.

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
412 global ratings

Customers say

Customers like the performance, quality, appearance, ease of installation, fit and weight of the outdoor recreation product. For example, they mention it works great, it's durable and it looks good. Some appreciate the weight.

AI-generated from the text of customer reviews

9 customers mention8 positive1 negative

Customers like the quality of the adapter. They mention it's well made, durable, and looks good.

"...The adapter is a well made, quality part which came w/the 2 bolts & washers needed to mount it & the caliper to the bike forks...." Read more

"...It's durable, looks good, easy to install, and it's Shimano. It's a pretty simple, but crucial product, no complaints. Not a bad price." Read more

"...It's strong and don't give the impression of fragile, very precise for 160mm rotors." Read more

"Great quality, no issues, installed easily to convert my bike from post to IS brakes...." Read more

8 customers mention8 positive0 negative

Customers are satisfied with the performance of the product. They mention that it works great, has great quality, and has no issues. Some say that it is easy to install.

"...I use SRAm brakes, and although it’s not shimano, it still works wonderfully." Read more

"Does exactly what it needs to. Worked great!" Read more

"Great quality, no issues, installed easily to convert my bike from post to IS brakes...." Read more

"Works great, plus the hardware/spacers allowed me to only buy this to replace a bent up bracket...." Read more

4 customers mention4 positive0 negative

Customers are satisfied with the appearance of the outdoor recreation product. They mention that it looks good and works great.

"...It's durable, looks good, easy to install, and it's Shimano. It's a pretty simple, but crucial product, no complaints. Not a bad price." Read more

"...Looks good." Read more

"as advertised, nice fit, looks good and works great." Read more

"Awesome design..." Read more

3 customers mention3 positive0 negative

Customers find the installation process of the outdoor recreation product to be easy. They mention it's durable, looks good, and is pretty simple to install.

"...It's durable, looks good, easy to install, and it's Shimano. It's a pretty simple, but crucial product, no complaints. Not a bad price." Read more

"Great quality, no issues, installed easily to convert my bike from post to IS brakes...." Read more

"Great quality and Easy install..." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the fit of the outdoor recreation product. They mention it looks good and works great.

"...Fitment was perfect on the rear even though the directions say front only." Read more

"...I have checked it after a few rides and it all seems tight." Read more

"as advertised, nice fit, looks good and works great." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the weight of the outdoor recreation product. They mention that it is lightweight and sturdy.

"very light weight but you save only 5 grams against other products...." Read more

"works but heavy." Read more

"lightweight and sturdy" Read more

Awesome design
5 Stars
Awesome design
This adaptor worked perfectly on my 200mm rotor post going to a 220mm rotor. I use SRAm brakes, and although it’s not shimano, it still works wonderfully.
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Top reviews from the United States

Reviewed in the United States on December 26, 2023
Size: 180-mm Post/Post FrontVerified Purchase
Reviewed in the United States on December 28, 2023
Size: 180-mm Post/Post FrontVerified Purchase
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5.0 out of 5 stars Awesome design
Reviewed in the United States on December 28, 2023
This adaptor worked perfectly on my 200mm rotor post going to a 220mm rotor. I use SRAm brakes, and although it’s not shimano, it still works wonderfully.
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Reviewed in the United States on February 15, 2020
Size: One SizeVerified Purchase
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5.0 out of 5 stars Quality Adapter For 180mm Disc Brake On Front Of Bike
Reviewed in the United States on February 15, 2020
Decided to upgrade my brakes on my MTB to discs. After some research & reading about sub-par brake mount adapters (misaligned holes, less than straight adapters, no mounting hardware) I decided to go w/Shimano parts. I know there a bit more expensive, but figured stopping power & reliability was not something I should cheap out on.

The SHIMANO SM-MA90 Disc Brake Adapter (for Post Front) was exactly what I needed to mount the SHIMANO M375 Post Mount Brake Caliper for my front forks brake. The adapter is a well made, quality part which came w/the 2 bolts & washers needed to mount it & the caliper to the bike forks. The bolts came w/thread locker preapplied. The adapter is also labeled so you know which way to mount it. This adapter was perfect for the caliper’s post mount holes, allowing for the 180mm SHIMANO XT SM- RT86 rotor to be installed.

If you need an adapter to mount a caliper & allow for a 180mm rotor on the front wheel of your bike, the SHIMANO SM-MA90 Disc Brake Adapter (for Post Front) should fit the bill.

Thank you for taking the time to read this review, I hope you found it helpful.
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5 people found this helpful
Report
Reviewed in the United States on October 7, 2018
Size: One SizeVerified Purchase
3 people found this helpful
Report
Reviewed in the United States on September 12, 2016
Size: 160-mm Post/IS RearVerified Purchase
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5.0 out of 5 stars It works!
Reviewed in the United States on September 12, 2016
This bracket does exactly what it's suppose to do, and has no problem doing it. It's durable, looks good, easy to install, and it's Shimano. It's a pretty simple, but crucial product, no complaints. Not a bad price.
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5 people found this helpful
Report
Reviewed in the United States on April 30, 2022
Size: One SizeVerified Purchase
Reviewed in the United States on July 29, 2012
Size: 160-mm Post/IS FrontVerified Purchase
Reviewed in the United States on May 31, 2020
Size: One SizeVerified Purchase

Top reviews from other countries

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ALMARQUEZ
1.0 out of 5 stars SHIMANO MA-90 Soporte de Montaje de Freno de Disco
Reviewed in Mexico on May 17, 2023
Size: 180-mm Post/IS RearVerified Purchase
Gwendal
1.0 out of 5 stars Très décevant
Reviewed in France on September 10, 2023
Size: One SizeVerified Purchase
Alfonso N.
5.0 out of 5 stars Pude poner un freno de disco de 180 en el eje trasero en vez del de 160 que traía de serie
Reviewed in Spain on June 17, 2023
Size: One SizeVerified Purchase
Jan M.
5.0 out of 5 stars Shimanoqualität
Reviewed in Germany on May 9, 2023
Size: One SizeVerified Purchase
E&E
5.0 out of 5 stars Di marca, realizzato bene e con tutto quello che serve per il montaggio
Reviewed in Italy on August 11, 2022
Size: One SizeVerified Purchase
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E&E
5.0 out of 5 stars Di marca, realizzato bene e con tutto quello che serve per il montaggio
Reviewed in Italy on August 11, 2022
Non c'è molto da dire, nella confezione c'è tutto, viti, spessori, rondelle e perfino il filo per fermare le viti forate ( non lo vedevo da quando ho abbandonato la moto da cross ). Facilissimo da montare, anche per chi è alle prime armi, Le istruzioni corredate da disegni sul manuale sono a prova di errore, c'è perfino indicato come girare il filo per realizzare un fermo adeguato. Il dimensionamento è perfetto. Il nuovo disco da 180 scorre senza incertezze, in fenata non si avvertono vibrazioni, segno che il tutto crea effettivamente un blocco solidale.
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