A private two-day MotoGP test session is being held at Motorland Aragon on Tuesday and Wednesday.
The Factory Honda and Yamaha teams are both present, plus the satellite Honda LCR team. Ducati has chosen to test in private at Mugello.
World Superbike star Jonathan Rea is making his second appearance for Repsol Honda, with a view to replacing the injured Casey Stoner at the forthcoming Misano and Aragon races.
Bradl got the chance to complete some laps on a factory Honda on Tuesday, while Yamaha's world championship leader Jorge Lorenzo put further laps on the new '2013' chassis.
1. Dani Pedrosa
ESP Repsol Honda (RC213V) 1m 47.983s
2. Jorge Lorenzo
ESP Yamaha Factory (YZR-M1) 1m 48.471s
3. Ben Spies
USA Yamaha Factory (YZR-M1) 1m 48.647s
4. Stefan Bradl
GER LCR Honda MotoGP (RC213V) 1m 49.570s
5. Jonathan Rea
GBR Repsol Honda (RC213V) 1m 50.679s
Official Aragon MotoGP records:
AUS Honda 1m 48.451s
Fastest race lap:
AUS Honda 1m 49.046s
June 2012 Aragon MotoGP test - Best laps:
Yamaha: Jorge Lorenzo
ESP Factory Yamaha 1m 49.187s
Ducati: Hector Barbera
ESP Pramac Racing 1m 50.196s
Honda: Alvaro Bautista
ESP Honda Gresini1m 50.294s
* The Repsol Honda Team did not attend.