Triumph T509 Speed Triple: MOT pass rate by registration year

Which T509 Speed Triple years pass first time, and which fall short of the model's 81.2% average, from 1,913 DVSA tests.

1997

highest-passing year · 82.5%

1999

lowest-passing year · 79.3%

3.2pp

spread across 3 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: 1997 (82.5% of 972 tests). Lowest: 1999 (79.3% of 169).

Registered	Tests	First-time pass	vs model (81.2%)
1997	972	82.5%	+1.3 pp
1998	758	79.7%	-1.5 pp
1999	169	79.3%	-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

first-time pass rate by test year · 2006–2025

Questions

Which T509 Speed Triple years have the lowest MOT pass rate?: none: no registration year of the Triumph T509 Speed Triple falls more than two points under the model's 81.2% overall pass rate.
Which T509 Speed Triple year has the highest MOT pass rate?: 1997, at 82.5% of 972 first tests (2005–2025).
How much does the T509 Speed Triple pass rate vary by year?: 3.2 percentage points between the highest (1997, 82.5%) and lowest (1999, 79.3%) 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 T509 Speed Triple reliability, failures and mileage · ranked #3336 of 5428 models· other Triumph models: Bonneville, Tiger, Sprint, Daytona, Speed Triple, Thunderbird