MZ 125SX vs Gilera Runner

The Gilera Runner passes its MOT first time more often than the MZ 125SX: 70.8% vs 66.5%, a 4.3-point lead.

MOT reliability, side by side

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

Metric	MZ 125SX	Gilera Runner
First-time pass rate	66.5%	70.8%
Outright fail rate	22.8%	21.5%
Vs comparable bikes (age & mileage adjusted)	-4.6 pts	-0.7 pts
Engine size	124cc	124cc
Rank among all models	#4940 of 5428	#4675 of 5428
Median miles at test	14,974	11,381
MOT tests analysed	263	69,850
Most common failure	lighting and signalling	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.

"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	MZ 125SX	Gilera Runner
0k-10k miles	76.1%	76.2%
10k-20k miles	59.3%	67.5%
20k-30k miles	62.8%	65.4%

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

MZ 125SX 66.5% pass · 263 tests GILERA RUNNER 70.8% pass · 69.9k tests

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