V-twin and big-single cruisers — feet forward, low seat, character first.
Cruisers are the biggest-selling motorcycle category in the US, full stop. Harley still sells more bikes than any other single brand, and the Indian Chief and Scout, Triumph Bonneville Bobber and Speedmaster, Honda Rebel 1100, BMW R 18 and Kawasaki Vulcan S all sit in this space.
The defining traits: feet-forward riding position, low seat, big-bore long-stroke V-twin or parallel-twin, character over outright performance. A cruiser isn't trying to be quick — it's trying to feel a particular way. Some are very good at this (Bonneville Bobber, Indian Chief, Rebel 1100). Some are just heavy bikes pretending to have soul (looking at you, several Harley product lines).
If you want a sport bike, don't buy a cruiser. If you want a thing that turns heads, sounds good, and rolls slowly through a town with you wearing an open-face helmet, this is the category. There's nothing wrong with that. Most riding most people do is more cruiser than supersport anyway.
1252cc liquid-cooled Revolution Max V-twin
1923cc Milwaukee-Eight 117 V-twin
1868cc Milwaukee-Eight 114 V-twin
1250cc liquid-cooled SpeedPlus V-twin
1890cc Thunderstroke 116 V-twin
1200cc parallel twin (HP tune)
1200cc parallel twin (HT tune)
2458cc inline triple
1084cc parallel twin (Africa Twin derived)
649cc parallel twin (refined)
942cc air-cooled V-twin · Last Yamaha mid-cruiser
1802cc air/oil-cooled boxer twin
1158cc Granturismo V4
1158cc Granturismo V4
349cc J-platform single · 805mm seat
648cc parallel twin · bobber-cruiser · 795mm seat
1890cc Thunderstroke · 27" seat · club-style cruiser · Low Rider S rival
975cc Revolution Max · liquid-cooled Sportster replacement · 27" seat
1923cc M-8 117 HO · West Coast 'club style' · Low Rider ST adds fairing+bags
Ninja 500 engine in cruiser frame
1679cc V4 muscle — killed 2020
1520cc flat-six Goldwing engine in cruiser bodywork, killed 2003
748cc V4 (VFR750-derived) — only V4 cruiser ever made, killed 2003
471cc parallel-twin (CB500F-derived) — A2-friendly cruiser
745cc V-twin classic cruiser — killed 2018
1783cc V-twin power-cruiser — killed 2019
648cc parallel-twin cruiser — A2-friendly
883cc air-cooled Sportster — killed 2022