Data as of: DVSA MOT results to 2025
Sinnis ZS 125-86 Terrain vs Gilera Runner
The Sinnis ZS 125-86 Terrain and Gilera Runner have an identical 70.8% first-time MOT pass rate.
MOT reliability, side by side
| Metric | Sinnis ZS 125-86 Terrain | Gilera Runner |
|---|---|---|
| First-time pass rate | 70.8% | 70.8% |
| Outright fail rate | 21.3% | 21.5% |
| Vs comparable bikes (age & mileage adjusted) | -3.7 pts | -0.7 pts |
| Engine size | 125cc | 124cc |
| Rank among all models | #4675 of 5428 | #4675 of 5428 |
| Median miles at test | 7,930 | 11,381 |
| MOT tests analysed | 2,152 | 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
| Component | Sinnis ZS 125-86 Terrain | Gilera Runner |
|---|---|---|
| Lights & signalling | 8.7% | 12.3% |
| Steering & suspension | 8.2% | 10.6% |
| Brakes | 10.3% | 7.2% |
| Tyres & wheels | 5.2% | 5.1% |
| Structure & body | 8.3% | 2.0% |
| Fuel & exhaust | 0% | 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
| Test year | Sinnis ZS 125-86 Terrain | Gilera Runner |
|---|---|---|
| 2020 | 84.3% | 75.8% |
| 2021 | 74.2% | 79.1% |
| 2022 | 69.2% | 80.5% |
| 2023 | 70.0% | 81.3% |
| 2024 | 69.2% | 84.0% |
| 2025 | 68.9% | 85.5% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | Sinnis ZS 125-86 Terrain | Gilera Runner |
|---|---|---|
| 0k-10k miles | 75.6% | 76.2% |
| 10k-20k miles | 61.6% | 67.5% |
| 20k-30k miles | 61.8% | 65.4% |
Bands with fewer than 30 tests for either bike are left out.
Sinnis ZS 125-86 Terrain vs Gilera Runner FAQ
Which is more reliable, the Sinnis ZS 125-86 Terrain or the Gilera Runner?
The Sinnis ZS 125-86 Terrain and Gilera Runner have an identical 70.8% first-time MOT pass rate. Adjusted for age, mileage and test class, the Gilera Runner still comes out ahead: -3.7 points vs comparable bikes for the Sinnis ZS 125-86 Terrain, -0.7 for the Gilera Runner. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Sinnis ZS 125-86 Terrain fail its MOT on most?
Brakes: 10.3% of Sinnis ZS 125-86 Terrain MOT tests failed on it, then lights & signalling (8.7%).
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%).
Which holds up better at high mileage, the Sinnis ZS 125-86 Terrain or the Gilera Runner?
At 20k-30k miles the Gilera Runner passes first time more often: 61.8% for the Sinnis ZS 125-86 Terrain vs 65.4% for the Gilera Runner.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.