The Quartz Disc Pro XXXL is a disc brake specific race frame in hydroformed 6061 alloy with Paradigm tubing. There are no V-brake mounts at all: braking runs off a flat mount 120mm calliper, with the line routed internally through the frame.
Pro XXXL sits at the long end of the range, with a 22.25" top tube and a 14.8" minimum chain stay set by the forged and CNC machined sliding dropouts. Those dropouts take 10 and 15mm axles only and carry an integrated chain tensioner.
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