Data as of: DVSA MOT results to 2025
Bsa M21: MOT pass rate by registration year
Which M21 years pass first time, and which fall short of the model's 92.6% average, from 996 DVSA tests.
Pass rate by registration year
Highest pass rate: 1957 (100.0% of 75 tests). Lowest: 1956 (86.0% of 57). Years more than two points below the model average: 1950, 1954, 1956.
| Registered | Tests | First-time pass | vs model (92.6%) |
|---|---|---|---|
| 1950 | 50 | 90.0% | -2.6 pp |
| 1952 | 64 | 93.8% | +1.2 pp |
| 1954 | 68 | 88.2% | -4.4 pp |
| 1955 | 78 | 91.0% | -1.6 pp |
| 1956 | 57 | 86.0% | -6.6 pp |
| 1957 | 75 | 100.0% | +7.4 pp |
| 1960 | 99 | 93.9% | +1.3 pp |
| 1961 | 119 | 95.0% | +2.4 pp |
| 1971 | 54 | 90.7% | -1.9 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 M21 years have the lowest MOT pass rate?
- 1950, 1954, 1956 registered examples pass first time less often than the Bsa M21 overall (92.6%); the 1956 cohort is lowest at 86.0% from 57 tests.
- Which M21 year has the highest MOT pass rate?
- 1957, at 100.0% of 75 first tests (2005–2025). Years more than two points above the model average: 1957, 1961.
- How much does the M21 pass rate vary by year?
- 14.0 percentage points between the highest (1957, 100.0%) and lowest (1956, 86.0%) 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: Bsa M21 reliability, failures and mileage · ranked #367 of 5428 models· other Bsa models: A10, Bantam, C15, A65, B31, B40