Historical clue formulations

• Motorcycle gang member — 2023-07-03
• Harley rider — 2008-01-01
• Yamaha customer — 2005-04-28
• Gang member, maybe — 2004-04-26
• Cyclist — 2004-03-11
• Certain gang member — 2001-12-01
• "Mad Max" extra — 2000-12-01
• Cycle enthusiast — 1996-02-14
• One on two wheels — 1996-02-11
• Hell's Angel — 1994-05-08