BIKERELIABILITY Reg check
Registration-year report · 2005–2025

Data as of: DVSA MOT results to 2025

Mutt Mongrel 125: MOT pass rate by registration year

Which Mongrel 125 years pass first time, and which fall short of the model's 69.0% average, from 3,527 DVSA tests.

2022
highest-passing year · 74.4%
2016
lowest-passing year · 62.9%
11.5pp
spread across 7 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: 2022 (74.4% of 90 tests). Lowest: 2016 (62.9% of 283). Years more than two points below the model average: 2016, 2018.

61%69%77%2016: 62.9% pass (283 tests)2017: 69.4% pass (1,130 tests)2018: 66.6% pass (925 tests)2019: 71.0% pass (651 tests)2020: 72.7% pass (205 tests)2021: 72.6% pass (241 tests)2022: 74.4% pass (90 tests)201620192022
RegisteredTestsFirst-time passvs model (69.0%)
2016 283 62.9% -6.1 pp
2017 1,130 69.4% +0.4 pp
2018 925 66.6% -2.4 pp
2019 651 71.0% +2.0 pp
2020 205 72.7% +3.7 pp
2021 241 72.6% +3.6 pp
2022 90 74.4% +5.4 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 · 2019–2025
52%67%83%2019: 57.1% pass (49 tests)2020: 77.5% pass (356 tests)2021: 65.7% pass (504 tests)2022: 68.3% pass (663 tests)2023: 69.0% pass (670 tests)2024: 68.4% pass (614 tests)2025: 68.8% pass (667 tests)20192025

Questions

Which Mongrel 125 years have the lowest MOT pass rate?
2016, 2018 registered examples pass first time less often than the Mutt Mongrel 125 overall (69.0%); the 2016 cohort is lowest at 62.9% from 283 tests.
Which Mongrel 125 year has the highest MOT pass rate?
2022, at 74.4% of 90 first tests (2005–2025). Years more than two points above the model average: 2020, 2021, 2022.
How much does the Mongrel 125 pass rate vary by year?
11.5 percentage points between the highest (2022, 74.4%) and lowest (2016, 62.9%) 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: Mutt Mongrel 125 reliability, failures and mileage · ranked #4799 of 5428 models· other Mutt models: Fat Sabbath 125, QM 250-2X Mongrel 250, Hilts 125, Akita 125, Mastiff 125, Desert Racer 125