Historical clue formulations

• Bikes with small engines — 2026-03-02
• Sorts with unruly hair — 2025-03-13
• Two-wheelers — 2019-08-12
• Relatives of scooters — 2019-07-02
• Speedy two-wheelers — 2008-12-29
• Scooters — 2001-10-11
• Lightweight road vehicles — 1998-11-07
• Urban transports — 1998-03-22
• Power bikes — 1997-04-20