Derbi GPR125 vs Gilera Runner

The Gilera Runner passes its MOT first time more often than the Derbi GPR125: 70.8% vs 59.6%, a 11.2-point lead.

MOT reliability, side by side

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

Metric	Derbi GPR125	Gilera Runner
First-time pass rate	59.6%	70.8%
Outright fail rate	29.7%	21.5%
Vs comparable bikes (age & mileage adjusted)	-15.1 pts	-0.7 pts
Engine size	124cc	124cc
Rank among all models	#5227 of 5428	#4675 of 5428
Median miles at test	6,154	11,381
MOT tests analysed	908	69,850
Most common failure	brakes	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.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Derbi GPR125	Gilera Runner
Lights & signalling	13.7%	12.3%
Steering & suspension	13.3%	10.6%
Brakes	14.1%	7.2%
Tyres & wheels	6.4%	5.1%
Structure & body	6.9%	2.0%
Drive system	6.6%	0.0%
Fuel & exhaust	2.6%	2.6%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Derbi GPR125	Gilera Runner
2011	47.9%	67.6%
2012	61.8%	69.5%
2013	58.4%	69.5%
2014	58.9%	70.6%
2015	67.0%	72.1%
2016	62.5%	73.3%
2017	58.3%	76.1%
2018	66.7%	77.2%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

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

Mileage	Derbi GPR125	Gilera Runner
0k-10k miles	62.6%	76.2%
10k-20k miles	50.6%	67.5%

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

Derbi GPR125 vs Gilera Runner FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Derbi GPR125 or the Gilera Runner?

The Gilera Runner passes its MOT first time more often than the Derbi GPR125: 70.8% vs 59.6%, a 11.2-point lead. Adjusted for age, mileage and test class, the Gilera Runner still comes out ahead: -15.1 points vs comparable bikes for the Derbi GPR125, -0.7 for the Gilera Runner. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Derbi GPR125 fail its MOT on most?

Brakes: 14.1% of Derbi GPR125 MOT tests failed on it, then lights & signalling (13.7%).

What does the Gilera Runner fail its MOT on most?

Lights & signalling: 12.3% of Gilera Runner MOT tests failed on it, then steering & suspension (10.6%).

DERBI GPR125 59.6% pass · 908 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.