KTM 125 DUKE 18

125cc Petrol Class 1

#4149 of 5426 overall #194 of 230 KTMs #189 of 205 naked bikes

76.3%

first-time pass rate

13.0%

failed outright

8,023

median miles at test

1,711

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2021–2025

The 125 DUKE 18's first-time pass rate has fallen 9.2 points since 2021, 78.3% to 69.1%.

Pass rate by mileage

how the 125 DUKE 18's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage 125 DUKE 18 passes first time 80.4% of the time; by 20k that's 63.7%.

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 18

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lamps and reflectors	176	32	4.4×
brakes	119	21.6	1.2×
structure and attachments	116	21.1	7.1×
suspension	56	10.2	3.8×
tyres	33	6	2.1×
steering	27	4.9	3.4×
Identification of the vehicle	11	2	2.8×
audible warning (Horn)	11	2	3.5×
wheels	1	0.2	1.0×

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 18 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 18.

Pass rate by registration year

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

Best year to buy used: 2018 (77.2% pass). Weakest: 2019 (73.5%).

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 18 FAQ

answers computed from the data above · terms in the glossary

Is the KTM 125 DUKE 18 reliable?

The KTM 125 DUKE 18 is more reliable than average for its class: 76.3% of its 1,711 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4149 of 5426 models.

What does a 125 DUKE 18 fail its MOT on most?

lamps and reflectors — 32% of all defects recorded against failed 125 DUKE 18 tests.

How many miles will a 125 DUKE 18 last?

The median 125 DUKE 18 shows 8,023 miles at test, and examples around 20k miles still pass 63.7% of the time — mileage alone rarely kills one.