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Which is better TBH, lighter action to pull than two spring.
Too cheap not to try out, give you extra money to buy decent compressionless housing too.
I upgraded the brake pads and rotor on a B'Twin Triban RC 500 that come with Promax brakes which is pretty much inferior compared to the tektro and was pleasantly surprised at how strong it is once fitted with avid bb5 pads and Aztec circular rotor (come compressionless as standard).
Looks like single adjust, not dual.