Triumph Bonneville vs Triumph Stag: MOT reliability compared
Updated 05 September 2026.
9.8%
Triumph Bonneville MOT failure rate, 12.8 pts lower than Triumph Stag
Triumph Bonneville is the more reliable MOT performer: 9.8% of Triumph Bonneville MOTs fail versus 22.6% for Triumph Stag, a 12.8 point gap.
| Metric | Triumph Bonneville | Triumph Stag |
|---|---|---|
| MOT failure rate | 9.8% | 22.6% |
| Tests analysed | 305,248 | 87,808 |
| Most common failure | Brakes (19.7%) | Lamps & electrical (40.6%) |
Questions and answers
Which is more reliable, Triumph Bonneville or Triumph Stag?
Triumph Bonneville is the more reliable MOT performer: 9.8% of Triumph Bonneville MOTs fail versus 22.6% for Triumph Stag, a 12.8 point gap.
What is the MOT failure rate of the Triumph Bonneville?
9.8% of Triumph Bonneville MOT tests result in a failure, from 305,248 tests.
What is the MOT failure rate of the Triumph Stag?
22.6% of Triumph Stag MOT tests result in a failure, from 87,808 tests.