Data as of: DVSA MOT results to 2025
Triumph Twenty One: MOT pass rate by registration year
Which Twenty One years pass first time, and which fall short of the model's 92.3% average, from 884 DVSA tests.
Pass rate by registration year
Highest pass rate: 1965 (97.8% of 89 tests). Lowest: 1964 (87.4% of 95). Years more than two points below the model average: 1959, 1964.
| Registered | Tests | First-time pass | vs model (92.3%) |
|---|---|---|---|
| 1958 | 75 | 90.7% | -1.6 pp |
| 1959 | 68 | 89.7% | -2.6 pp |
| 1960 | 94 | 95.7% | +3.4 pp |
| 1961 | 117 | 93.2% | +0.9 pp |
| 1962 | 119 | 92.4% | +0.1 pp |
| 1963 | 100 | 91.0% | -1.3 pp |
| 1964 | 95 | 87.4% | -4.9 pp |
| 1965 | 89 | 97.8% | +5.5 pp |
Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years. A first-time MOT pass is a roadworthiness check, not a full mechanical inspection.
Pass rate over time
Questions
- Which Twenty One years have the lowest MOT pass rate?
- 1959, 1964 registered examples pass first time less often than the Triumph Twenty One overall (92.3%); the 1964 cohort is lowest at 87.4% from 95 tests.
- Which Twenty One year has the highest MOT pass rate?
- 1965, at 97.8% of 89 first tests (2005–2025). Years more than two points above the model average: 1960, 1965.
- How much does the Twenty One pass rate vary by year?
- 10.4 percentage points between the highest (1965, 97.8%) and lowest (1964, 87.4%) cohorts with at least 50 tests. Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.
Full report: Triumph Twenty One reliability, failures and mileage · ranked #415 of 5428 models· other Triumph models: Bonneville, Tiger, Sprint, Daytona, Speed Triple, Thunderbird