2027 Triumph Bonneville T40: a single-cylinder Bonneville joins the 400 line

Triumph has expanded its 400 range with the 2027 Bonneville T40, plus a darker T40 Black version. It is the first single-cylinder Bonneville, built on a retuned TR Series engine from the Speed 400.

The bike comes with a set of electronic rider aids. Triumph will announce pricing in early 2027, and the first bikes reach US dealers in late spring 2027.

• Engine — 398 cc single
• Seat height — 790 mm
• Ready-to-ride weight — 191 kg