As an established engine builder, Greeves was able to survive while many rivals disappeared, along with the supply of Villiers engines, in the late 1960s. The first (virtually) all-Greeves model was the Challenger scrambler of 1964. The Challenger engine incorporated an Alpha crankshaft assembly within Greeves' own crankcases. Mated to an Albion gearbox, this new power unit was carried in typically-Greeves cycle parts consisting of a cast alloy beam frame and leading-link forks, the latter of the 'banana' type from 1965 with Cerianis optional. For the 1967 season the Challenger boasted a lengthened frame while also featuring new conical alloy hubs.
This example was acquired by the immediately preceding owner in South Africa. When Bonhams offered this motorcycle for sale at its Bristol Classic Bike Show auction in February 2012 (Lot 93), we were advised that the engine has been rebuilt with new bearings and seals, the primary chain renewed, the forks overhauled, the tank and side panels repainted, and Nametab electronic ignition fitted. The cylinder liner was said to be chipped at the bottom, though piston movement remained unaffected. The glassfibre tank has not been filled with fuel since being repainted. The current vendor purchased the Greeves at the aforementioned sale, since when it has not been used. It should be noted that although the frame number is that of an MX2, the frame itself is of the later MX4 type.