Derbi Mulhacen vs Suzuki GSF600

The Suzuki GSF600 passes its MOT first time more often than the Derbi Mulhacen: 77.3% vs 75.1%, a 2.2-point lead.

MOT reliability, side by side

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

Metric	Derbi Mulhacen	Suzuki GSF600
First-time pass rate	75.1%	77.3%
Outright fail rate	13.7%	14.2%
Vs comparable bikes (age & mileage adjusted)	-5.5 pts	-6.1 pts
Engine size	650cc	599cc
Median miles at test	5,156	21,080
MOT tests analysed	197	143,023
Most common failure	brakes	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	Derbi Mulhacen	Suzuki GSF600
0k-10k miles	80.7%	86.8%
10k-20k miles	60.0%	80.1%

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

DERBI MULHACEN 75.1% pass · 197 tests SUZUKI GSF600 77.3% pass · 143k tests

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