Triumph T21 vs Suzuki DR-Z400S

The Triumph T21 passes its MOT first time more often than the Suzuki DR-Z400S: 92.5% vs 80.4%, a 12.1-point lead.

MOT reliability, side by side

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

Metric	Triumph T21	Suzuki DR-Z400S
First-time pass rate	92.5%	80.4%
Outright fail rate	3.9%	11.1%
Median miles at test	13,628	6,940
MOT tests analysed	612	26,773
Most common failure	steering and suspension	lighting and signalling

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.

TRIUMPH T21 92.5% pass · 612 tests SUZUKI DR-Z400S 80.4% pass · 26.8k tests

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