KTM 390 DUKE 21

373cc Petrol Class 2

#2306 of 5426 overall #80 of 230 KTMs #99 of 205 naked bikes

85.7%

first-time pass rate

6.0%

failed outright

3,755

median miles at test

414

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2024–2025

The 390 DUKE 21's first-time pass rate has risen 2.1 points since 2024, 84.3% to 86.4%.

What fails on a 390 DUKE 21

failure defects by component group · advisories excluded

Component group	Defects	% of defects
structure and attachments	12	25
lamps and reflectors	11	22.9
brakes	9	18.8
suspension	8	16.7
steering	4	8.3
tyres	2	4.2
audible warning (Horn)	1	2.1
Identification of the vehicle	1	2.1

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 390 DUKE 21 beats 2 of its 2 closest rivals (HONDA CB400, HONDA CB400N).

HONDA CB400 80.9% pass · 9,072 tests HONDA CB400N 77.5% pass · 5,366 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 390 DUKE 21.

Pass rate by registration year

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

Best year to buy used: 2021 (87.0% pass). Weakest: 2021 (87.0%).

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.