Triumph 1500 vs Triumph T 120 bonneville: 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 T 120 bonneville
94%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Triumph 1500 (74%) and Triumph T 120 bonneville (94%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Triumph 1500 | Triumph T 120 bonneville |
|---|---|---|
| MOT pass rate | 74% | 94% ✓ |
| MOT failure rate | 26% | 6% ✓ |
| Faults & advisories per test | 2.3 | 0.3 ✓ |
| Dangerous-fault share | 0% | 0% |
| Average mileage | 58,068 mi | 29,045 mi |
| Sample size (vehicles) | 37,142 | 2 |
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 T 120 bonneville
- Drive chain excessively loose (6.2.1d)
- Front Brake lever has inadequate reserve travel (3.1.3b)
- Front Wheel has a slightly distorted bead rim. (4.2.2)
- Front shock absorber has light misting of stanchion (2.3.3)
- Handlebar mounting slightly deteriorated (2.1.1d)
- Front Roller brake test Higher brake efficiency normally obtainable. (3.3.A2b)
Reliability FAQ
On MOT pass rate the Triumph 1500 (74%) and Triumph T 120 bonneville (94%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Triumph 1500 report Full Triumph T 120 bonneville 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.