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brakes - What are the reasons for these two very different post mount adapter designs? - Bicycles Stack Exchange
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Shimano Original Adaptor Flat Mount to Postmount Brake 140mm 160mm, SM MA R140P/D , R160P/D , F140P/D , F160P/D|shimano 160mm|shimano brakebrake adaptor - AliExpress
![Amazon.com : AEcreative 20mm Post Mount Adapter for 180mm 200mm 203mm disc Rotor Brake Caliper 74mm PM Mountain Bike Fork Bicycle Frame : Sports & Outdoors Amazon.com : AEcreative 20mm Post Mount Adapter for 180mm 200mm 203mm disc Rotor Brake Caliper 74mm PM Mountain Bike Fork Bicycle Frame : Sports & Outdoors](https://m.media-amazon.com/images/I/514XBZ9eRnL.jpg)