These are simple and inexpensive to make and maintain, but they can produce noticeable vibration - especially the larger-capacity ones.
Twin cylinders come in parallel-twin, V-twin, or boxer layouts which offer a great balance of refinement and performance.
Twins like the Aprilia Tuono 457 and BMW F 450 GS are great for highways, and V-twins like Harley-Davidsons deliver strong low-end torque ideal for hills and traffic.
Boxer twins are rare in lower displacement bikes, but found on exotics like the BMW R 1300 GS
A triple cylinder balances the torque-y nature of twins and the high-revving excitement of fours with a great exhaust note.
They feel lively yet composed, fun when pushed hard and easygoing otherwise, which makes them well-suited to India's growing touring culture.
Inline-fours are most commonly found in Japanese performance bikes like the Kawasaki Z900, Honda CBR1000RR, and others.
V4 engines are most common on top-end Italian bikes - Ducatis & Aprilias.
They sound distinct and offer similar performance as inline-fours in a compact form, but they are quite complex.