2021 Triumph Bonneville T120 Black 1.2L Petrol · KY71 OMX

The Triumph Bonneville T120 Black presents a stable and improving maintenance trend, culminating in a fully clean pass on 28 February 2026 at 18,531 miles with zero defects recorded. That clean sheet follows a minor failure just over a year earlier on 27 February 2025, when the tester flagged a headlamp aim too low under item 4.1.2 (a) at 14,874 miles. The same-day retest on 27 February 2025 passed with no further issues, indicating the previous owner corrected the aim promptly rather than allowing a known fault to persist. The trajectory from a single lighting defect to a completely unblemished test suggests attentive rather than reactive vehicle care. The mileage pattern reinforces that picture of light, consistent use. Across roughly five years the bike has covered 18,531 miles, averaging approximately 3,706 miles per year. The gap between the February 2025 test at 14,874 miles and the February 2026 test at 18,531 miles shows 3,657 miles covered in twelve months, which sits neatly within the annual average and indicates steady riding rather than long periods of dormancy or sudden high-mileage bursts. There are no suspicious mileage gaps or reversals in the record, and the data set, while sparse at only three entries, is internally consistent. From a mechanical risk perspective, the absence of any suspension, braking, drivetrain, or structural advisories across all three tests is notable. No corrosion, exhaust emissions, tyre wear, or component deterioration items have been flagged at any stage, which is encouraging for a machine of this age. The only defect was a simple headlamp aim adjustment, a minor setup issue rather than a symptom of underlying neglect. A buyer should still verify the condition of consumable items in person, particularly tyre age and tread depth, brake pad and disc wear, chain and sprocket wear, and suspension linkage play, since low annual mileage can mask deterioration from age-related degradation rather than use. Inspect the headlamp aim and electrical function personally, confirm there are no fluid leaks around fork seals and brake callipers, and check the underside and frame welds for corrosion, especially if the bike has been stored for extended periods between rides. The MOT record is clean, but a hands-on inspection remains essential to validate that the mechanical reality matches the paper trail.