The ZTTO flat mount to post mount brake adapter generally works for the front brake but has a significant compatibility issue with the rear, causing the brake to sit crooked, which led one reviewer to replace it with a Shimano GRX brake. The adapter includes pre-greased screws and is intended for mixing road/gravel and mountain bike components.
Cons
Reviews & Ratings
13:16The reviewer discusses the ZTTO flat mount to post mount adapters when installing brakes on their gravel bike build. They mention using these adapters to convert the frame's flat mount system to accommodate post mount brakes, which are standard for mountain bikes. The reviewer notes the adapters came with pre-greased screws, making installation easier. However, they encounter a significant issue where the rear brake adapter doesn't fit properly with the frame, causing the brake to sit crooked. This forces them to purchase a Shimano GRX brake instead. The front brake adapter works correctly, but the rear compatibility issue is a major drawback.
07:46The ZTTO Gravel Road Bike Brake Adapter Flat Mount 34mm 71mm To Post Mount 74mm 140mm 160mm Rotor Bicycle Caliper Converter is not mentioned in this video.
Where to Buy

ZTTO Gravel Road Bike Brake Adapter Flat Mount 34mm 71mm To Post Mount 74mm 140mm 160mm Rotor Bicycle Caliper Converter - AliExpress 18

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