2017 Triumph Bonneville 0.9L Petrol · AX17 KHT

The Triumph Bonneville presents a largely sound mechanical picture as of its most recent test. The August 2025 pass at 12,227 miles came with zero defects, and the headlamp aim fault flagged on the same day was a minor, easily corrected item rather than a mechanical concern. Looking back across the record, the maintenance trend is broadly stable. The 2024 advisory for slight free play in the steering head bearing did not recur in 2025, suggesting either an adjustment was made or the wear has not progressed to a point requiring further action. This is a reassuring pattern for a bike of this age. The mileage profile is exceptionally low at just 12,227 miles recorded over nine years, averaging roughly 1,359 miles per year. The 2022 to 2024 tests show only 446 miles added across two full years of testing, and the 2025 test recorded no increase at all from the previous year. This points to either very light use or a period of prolonged standing. Low mileage in itself is not a problem, but extended periods without regular running can introduce its own risks, particularly around fuel system condition, tyre age-related cracking, and brake components seizing from lack of use. A buyer inspecting this machine in person should pay close attention to the steering head bearing area given the 2024 advisory. Even though it did not reappear, checking for notchiness or play at full lock and on the centre stand is sensible. Tyres deserve scrutiny for date codes and sidewall deterioration, as low annual mileage often means original rubber well past its serviceable life regardless of remaining tread. Brake calipers and disc surfaces should be examined for corrosion or binding, particularly if the bike has stood unused for extended periods. Fuel quality and carburettor or fuel injection condition are also worth verifying given the minimal recent mileage accumulation.