Rieju Marathon: MOT pass rate by registration year

Which Marathon years pass first time, and which fall short of the model's 59.9% average, from 1,020 DVSA tests.

2017

highest-passing year · 66.9%

2013

lowest-passing year · 49.1%

17.8pp

spread across 5 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: 2017 (66.9% of 136 tests). Lowest: 2013 (49.1% of 57). Years more than two points below the model average: 2013, 2015.

Registered	Tests	First-time pass	vs model (59.9%)
2013	57	49.1%	-10.8 pp
2014	220	58.6%	-1.3 pp
2015	209	57.4%	-2.5 pp
2016	280	60.0%	+0.1 pp
2017	136	66.9%	+7.0 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 · 2017–2025

Questions

Which Marathon years have the lowest MOT pass rate?: 2013, 2015 registered examples pass first time less often than the Rieju Marathon overall (59.9%); the 2013 cohort is lowest at 49.1% from 57 tests.
Which Marathon year has the highest MOT pass rate?: 2017, at 66.9% of 136 first tests (2005–2025).
How much does the Marathon pass rate vary by year?: 17.8 percentage points between the highest (2017, 66.9%) and lowest (2013, 49.1%) 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: Rieju Marathon reliability, failures and mileage · ranked #5219 of 5428 models· other Rieju models: MRT, RS2, RS, MRT 50, RS2 50, RR 50