Triumph 1500 vs Triumph Bonneville t120: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Triumph 1500
74%
MOT pass rate · 37,142 vehicles
Triumph Bonneville t120
93%
MOT pass rate · 1,500 vehicles
More reliable
Verdict: On MOT pass rate, the Triumph Bonneville t120 is the more reliable of the two — 93% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Triumph 1500 | Triumph Bonneville t120 |
|---|---|---|
| MOT pass rate | 74% | 93% ✓ |
| MOT failure rate | 26% | 7% ✓ |
| Faults & advisories per test | 2.3 | 0.2 ✓ |
| Dangerous-fault share | 0% ✓ | 4% |
| Average mileage | 58,068 mi | 6,007 mi |
| Sample size (vehicles) | 37,142 | 1,500 |
Most common faults
Triumph 1500
- Parking brake: efficiency below requirements (3.7.B.7)
- Windscreen washer provides insufficient washer liquid (8.2.3)
- Nearside Rear wheel bearing has slight play (2.6.2)
- Offside Rear wheel bearing has slight play (2.6.2)
- Brakes imbalanced across an axle (3.7.B.5b)
- Oil leak
Triumph Bonneville t120
- Front Tyre worn close to the legal limit (5.2.3 (e))
- Rear Tyre worn close to the legal limit (5.2.3 (e))
- Headlamp aim too low (4.1.2 (a))
- Front Brake indicates slight fluctuation of brake effort (1.2.1 (e))
- Headlamp not working on dipped beam (4.1.1 (a) (ii))
- Headlamp aim too high (4.1.2 (a))
Reliability FAQ
On MOT pass rate, the Triumph Bonneville t120 is the more reliable of the two — 93% pass first time versus 74%. It's one signal among several; check the full breakdown below.
Full Triumph 1500 report Full Triumph Bonneville t120 report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.