Derbi Terra vs Gilera Runner

The Derbi Terra passes its MOT first time more often than the Gilera Runner: 71.1% vs 70.8%, a 0.3-point lead.

MOT reliability, side by side

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

Metric	Derbi Terra	Gilera Runner
First-time pass rate	71.1%	70.8%
Outright fail rate	16.5%	21.5%
Vs comparable bikes (age & mileage adjusted)	-2.9 pts	-0.7 pts
Engine size	124cc	124cc
Rank among all models	#4652 of 5428	#4675 of 5428
Median miles at test	5,586	11,381
MOT tests analysed	744	69,850
Most common failure	lamps and reflectors	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 Terra	Gilera Runner
Lights & signalling	9.0%	12.3%
Steering & suspension	5.9%	10.6%
Brakes	6.3%	7.2%
Tyres & wheels	2.2%	5.1%
Structure & body	3.5%	2.0%
Fuel & exhaust	0.3%	2.6%
Drive system	1.7%	0.0%

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 Terra	Gilera Runner
2018	68.1%	77.2%
2019	73.2%	77.0%
2020	77.8%	75.8%
2021	70.0%	79.1%
2022	71.3%	80.5%
2023	66.7%	81.3%
2024	71.4%	84.0%
2025	71.8%	85.5%

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 Terra	Gilera Runner
0k-10k miles	73.9%	76.2%
10k-20k miles	64.7%	67.5%

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

Derbi Terra vs Gilera Runner FAQ

answers computed from the data above · terms in the glossary

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

The Derbi Terra passes its MOT first time more often than the Gilera Runner: 71.1% vs 70.8%, a 0.3-point lead. Adjusted for age, mileage and test class, the Gilera Runner still comes out ahead: -2.9 points vs comparable bikes for the Derbi Terra, -0.7 for the Gilera Runner. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Derbi Terra fail its MOT on most?

Lights & signalling: 9.0% of Derbi Terra MOT tests failed on it, then brakes (6.3%).

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 TERRA 71.1% pass · 744 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.