KTM 890 Duke R 21 vs Triumph Street Triple

The KTM 890 Duke R 21 passes its MOT first time more often than the Triumph Street Triple: 92.9% vs 87.7%, a 5.2-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	KTM 890 Duke R 21	Triumph Street Triple
First-time pass rate	92.9%	87.7%
Outright fail rate	2.3%	5.9%
Vs comparable bikes (age & mileage adjusted)	+3.8 pts	+1.3 pts
Engine size	889cc	675cc
Rank among all models	#315 of 5428	#1695 of 5428
Median miles at test	4,942	11,189
MOT tests analysed	308	37,699
Most common failure	lamps and reflectors	brakes

First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	KTM 890 Duke R 21	Triumph Street Triple
0k-10k miles	93.3%	91.3%
10k-20k miles	90.2%	86.7%

Bands with fewer than 30 tests for either bike are left out.

KTM 890 DUKE R 21 92.9% pass · 308 tests TRIUMPH STREET TRIPLE 87.7% pass · 37.7k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.