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The R539 is an excellent dual pivot caliper brake for road bikes. Made of forged aluminum arms, this caliper is solid, yet only weighs in at 160grams each. The R539 features Tektro’s new lock device QR. Standard calipers don’t open very wide. Therefore, it is hard to get wider tires out. However, Tektro has increased the width that it opens as well as added on a safety lock devise.