BSA D14

175cc Petrol Class 1

#1145 of 5426 overall #51 of 62 BSAs #697 of 2787 other bikes

89.4%

first-time pass rate

3.4%

failed outright

13,095

median miles at test

445

MOT tests, 2005–2025

Pass rate over time

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

The D14's first-time pass rate has risen 13.1 points since 2006, 83.7% to 96.8%.

Pass rate by mileage

how the D14's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage D14 passes first time 87.2% of the time; by 20k that's 92.1%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a D14

failure defects by component group · advisories excluded

Component group	Defects	% of defects
steering and suspension	16	41
tyres and wheels	8	20.5
lighting and signalling	4	10.3
drive system	3	7.7
brakes	3	7.7
fuel and exhaust	1	2.6
body and structure	1	2.6
driving controls	1	2.6
Items Not Tested	1	2.6
lamps and reflectors	1	2.6

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the D14 beats 1 of its 1 closest rivals (BSA BANTAM).

BSA BANTAM 88.7% pass · 7,201 tests

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the D14.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 1968 (89.7% pass). Weakest: 1969 (84.4%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.