KTM 125 DUKE 12

125cc Petrol Class 1

#4829 of 5426 overall #227 of 230 KTMs #201 of 205 naked bikes

68.4%

first-time pass rate

21.7%

failed outright

11,608

median miles at test

566

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2015–2023

The 125 DUKE 12's first-time pass rate has fallen 7.8 points since 2015, 73.5% to 65.7%.

Pass rate by mileage

how the 125 DUKE 12's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage 125 DUKE 12 passes first time 70.4% of the time; by 20k that's 66.1%.

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 125 DUKE 12

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	65	21.6	2.0×
brakes	64	21.3	2.0×
steering and suspension	44	14.6	1.9×
lamps and reflectors	42	14	3.2×
structure and attachments	27	9	5.7×
drive system	17	5.6	2.9×
suspension	16	5.3	3.1×
tyres and wheels	9	3	0.6×
tyres	9	3	2.1×
body and structure	8	2.7	2.6×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the 125 DUKE 12 beats 0 of its 1 closest rivals (HONDA CB125F).

HONDA CB125F 81.2% pass · 30.6k 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 125 DUKE 12.

Pass rate by registration year

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

Best year to buy used: 2012 (68.2% pass). Weakest: 2012 (68.2%).

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.

KTM 125 DUKE 12 FAQ

answers computed from the data above · terms in the glossary

Is the KTM 125 DUKE 12 reliable?

The KTM 125 DUKE 12 is less reliable than average for its class: 68.4% of its 566 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4829 of 5426 models.

What does a 125 DUKE 12 fail its MOT on most?

lighting and signalling — 22% of all defects recorded against failed 125 DUKE 12 tests.

How many miles will a 125 DUKE 12 last?

The median 125 DUKE 12 shows 11,608 miles at test, and examples around 20k miles still pass 66.1% of the time — mileage alone rarely kills one.