This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1959 Gilera 150 Sport was produced prior to Gilera’s buyout by Piaggio and acquired by the seller four years ago. 500cc Gileras won Grand Prix championships six times in the 1950s, including four championships in a row from 1952 to 1955. This example is powered by a 150cc single-cylinder and has completed three historic Motogiro events. A mechanical rebuild is said to have been performed by the previous owner, and the bike wears an older repaint. The seller describes it as reliable and has maintained it at his vintage motorcycle shop. This Gilera is sold with a clean California title in the seller’s name.
The bike is cosmetically standard and retains its original instrument-in-headlight binnacle, seat, and gas tank. All of the lights and the horn are in working order, though the taillight lens is cracked.
The previous owner used this bike as a backup for his Ducatis on one Motogiro in Italy and two in California. It has now completed three events reliably, which the Ducatis were reportedly unable to do.
The paintwork shows a decent shine with crisp edges between the red, black, and white paint, though some orange peel and other imperfections are visible. Original-type graphics are present.
Rust repair is present on the underside of the fuel tank, and the area has not been repainted. The odometer shows 16k kilometers (~10k miles) and is believed accurate.
The seller has provided a walk-around and cold startup video.
Wheels are original San Remos and are laced to drum brake hubs. The tires are older and are starting to crack.
Fairly little brightwork is present, but the polished cast aluminum and the few pieces of chrome have healthy finishes. The single muffler is a correct item and wears a “Gilera Approved” stamping.
No service records from the previous owner are included, though they reportedly performed a mechanical restoration of the bike. The seller has performed additional work at his own shop, including replacing the shift seal, adjusting the points, setting the timing, replacing the spark plug, performing a valve adjustment, and adjustments of both brakes. Per the seller the bike starts on the first kick, and the charging system has proven very reliable over the 400+ miles added since going through it.
Two drive-by videos have been provided, one above and a second that can be viewed here.