De Rosa King 3 RS Frameset

The De Rosa King 3 RS Frameset carries one of Italian cycling's most storied family names into a modern carbon race frame. De Rosa was founded in Milan in 1953 by Ugo De Rosa, and the brand built its reputation through direct, personal ties to professional racing rather than marketing campaigns. Ugo became Eddy Merckx's personal mechanic in 1972, a partnership that ran through the rest of Merckx's career, and by 1973 De Rosa's heart logo was already appearing on professional team bikes. The King 3 carries that racing lineage forward into carbon: the original King 3 was the carbon frame De Rosa hand-built in Italy for the 2008 Rock Racing Team, and the King 3 RS variant continued that connection as the frame of choice for the Fly V Australia team.

The frame itself is a monocoque built from Toray T-700SC carbon fiber, paired with 46T HS40 carbon pre-preg through key sections of the layup. That combination is what gets the King 3 RS down to a frame weight under 1kg — De Rosa lists it at roughly 10 percent lighter than the standard King 3, which itself was already built around a target weight near 950 grams. For a monocoque frame from an Italian builder with De Rosa's history of hand-finishing every frame, that's a genuinely light structure, built to hold the stiffness-to-weight balance a race frame needs under hard accelerations and out-of-the-saddle efforts.

Up front, the King 3 RS pairs with a De Rosa custom Mizuno full carbon fork built with a straight-blade design, mounted to a 1 1/8" hiddenset headset that keeps the head tube junction clean and free of external cups. The bottom bracket uses De Rosa's own 70mm Italian threaded standard rather than a press-fit design, a detail that matters to riders who'd rather deal with a serviceable, creak-resistant threaded shell over the life of the frame than chase down press-fit bearing noise. The front derailleur mounts via a 35.0mm clamp-on band, and De Rosa specs its own integrated seatpost, adjustable across roughly 5cm of setback and height, rather than relying on a generic round post — a detail that keeps the seat tube junction as clean as the head tube.

The King 3 RS frameset is available in Black/Red or Black/Orange, colorways that echo the bolder team liveries De Rosa has run through its racing history rather than a muted, understated finish. As a frameset rather than a complete build, it's aimed at a rider who wants to spec their own groupset, wheels, and cockpit around a race-proven Italian carbon platform — a common route for riders upgrading from an older frame or carrying over parts from a previous bike rather than starting from scratch with a full build.

De Rosa's own history runs from Ugo's earliest steel frames in the 1950s through titanium in 1993, aluminum by 1996, and into carbon by 2000, with the King 3 RS representing the racing-focused output of that carbon era. It's a frame built by a company that spent decades as the frame supplier behind some of the sport's most recognizable riders and teams before selling to the public at this level, and that history is part of what a rider is buying along with the carbon layup itself. For a rider who wants an Italian-built frameset with a direct line back to De Rosa's Molteni and Merckx-era racing pedigree — built light, finished with the brand's own fork, seatpost, and Italian threaded bottom bracket — the King 3 RS carries real racing history into a build a rider can spec on their own terms.