Michael Laverty will make his MotoGP debut on team-mate Yonny Hernandez's spare ART Aprilia at the first Sepang test in early February, rather than the new PBM bike.
Laverty is now expected to debut the PBM machine, which he will campaign in the CRT class this season, at the second pre-season test in Malaysia.
The PBM bike features a conventional aluminium twin spar chassis design, with adjustable head pipe and swingarm pivot positions, which has been built by GPMS.
It will be powered by the Aprilia engine used in the full ART machines, but run the new Magneti Marelli control ECU.
The machine was on course to make its debut in the first Sepang test on February 5, although MotoGP.com
reports that the team has delayed its introduction until the second test on February 26 to ensure the bike is prepared to the highest possible standard.
Rather than waiting until then, Laverty will participate in the opening test on Hernandez's second ART to gain experience of the Bridgestone tyres and carbon brakes as he prepares for his first taste of MotoGP action in 2013.