2017 Triumph Bonneville 0.9L Petrol · SL17 GXD

The Triumph Bonneville’s most recent MOT on 2025-05-08 confirms it remains roadworthy with no defects recorded, though the test was conducted just over two years ago—well beyond the standard annual requirement for a vehicle of this age. The absence of advisories or failures across all five tests suggests no recurring mechanical issues, but the prolonged gap since the last inspection raises questions about whether routine maintenance has been consistently applied. The 2021 test cycle is particularly notable for a rare failure on 2021-08-12, followed by an immediate retest on 2021-08-13 that passed without explanation, indicating either a minor oversight or a one-off anomaly. The recorded mileage of 7,955 miles at the latest test reflects an unusually low annual average of approximately 884 miles over nearly nine years, which could imply limited use or extended periods of storage. The largest gap between tests occurred between 2022 and 2024, where mileage increased by only 518 miles over 18 months—a pattern that may correlate with reduced driving frequency. While low mileage generally correlates with less wear on high-stress components like suspension bushes or brake calipers, the lack of recent service records means critical fluids (brake, clutch, coolant) and filters may not have been refreshed according to manufacturer intervals. Given the clean MOT history, the primary focus for an in-person inspection should centre on components that degrade passively over time rather than mileage. The suspension—particularly rear coil springs and bushes—should be checked for uneven wear or corrosion, as these are less likely to fail catastrophically but can compromise handling. Binding rear brakes, a common issue in motorcycles, should be tested for smooth operation under load, alongside the integrity of brake discs for uneven wear or heat checking. Structural corrosion, particularly around the frame’s underseats and exhaust mounts, warrants scrutiny, especially if the bike has spent extended periods exposed to moisture. The absence of advisories does not preclude hidden wear, so attention to tire tread depth and alignment—despite the low mileage—is advisable, as uneven wear could indicate past neglect in wheel balancing or suspension adjustments.