Triumph Bonneville 750: MOT pass rate by registration year

Which Bonneville 750 years pass first time, and which fall short of the model's 85.2% average, from 630 DVSA tests.

1975

highest-passing year · 96.4%

1976

lowest-passing year · 73.2%

23.2pp

spread across 6 years

Pass rate by registration year

first-time pass rate · cohorts with 50 or more tests · registration year from first use date

Highest pass rate: 1975 (96.4% of 56 tests). Lowest: 1976 (73.2% of 56). Years more than two points below the model average: 1976, 1977, 1980.

Registered	Tests	First-time pass	vs model (85.2%)
1975	56	96.4%	+11.2 pp
1976	56	73.2%	-12.0 pp
1977	96	81.3%	-3.9 pp
1978	122	83.6%	-1.6 pp
1979	103	89.3%	+4.1 pp
1980	72	77.8%	-7.4 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

first-time pass rate by test year · 2006–2017

Questions

Which Bonneville 750 years have the lowest MOT pass rate?: 1976, 1977, 1980 registered examples pass first time less often than the Triumph Bonneville 750 overall (85.2%); the 1976 cohort is lowest at 73.2% from 56 tests.
Which Bonneville 750 year has the highest MOT pass rate?: 1975, at 96.4% of 56 first tests (2005–2025). Years more than two points above the model average: 1975, 1979.
How much does the Bonneville 750 pass rate vary by year?: 23.2 percentage points between the highest (1975, 96.4%) and lowest (1976, 73.2%) 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 Bonneville 750 reliability, failures and mileage · ranked #2445 of 5428 models· other Triumph models: Bonneville, Tiger, Sprint, Daytona, Speed Triple, Thunderbird