Bonneville Bobber

2025 Triumph Bonneville Bobber Technical Analysis & Specification Breakdown

At the heart of the 2025 Triumph Bonneville Bobber motorcycle, Triumph pairs a 1200 cc engine architecture with road-focused gearing. In factory specification, peak output is rated at 76.9 HP at 6,100 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 64.1 HP per liter and a 2,100 rpm working window between peak torque (4,000 rpm) and peak power (6,100 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the Bonneville Bobber measures 553 kg (1219 lbs) wet (curb), translating to a power-to-weight ratio of 0.14 HP/kg (7.19 kg per horsepower). Rider ergonomics and chassis geometry center around a 27 mm (1.1 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 59 mm (2.3 in) wheelbase engineered for quick, flickable steering geometry. The 12-liter (3.2 US gal) fuel tank paired with a rated consumption of 60.9 L/100 km provides an estimated theoretical range of roughly 20 km (12 miles) between fill-ups.

Within MotoLibrary's Triumph archive, this model family spans 10 indexed model years from 2017 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.