SINNIS TERRAIN 125
The pass rate is the MOT first-time pass: a roadworthiness check of the items an MOT covers (brakes, lights, tyres, steering, structure, emissions), not a full mechanical inspection of engine or gearbox internals. It is a reliability signal, not a complete measure of mechanical reliability. What this measures.
“vs expected” adjusts for age, mileage and test class, so a cherished classic and a hard-used commuter are compared fairly. How this works.
Pass rate over time
The TERRAIN 125's first-time pass rate has fallen 5.0 points since 2024, 77.0% to 72.0%.
What fails on a TERRAIN 125
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| brakes |
|
88 | 25.5 | 2.0× |
| structure and attachments |
|
77 | 22.3 | 11.7× |
| lamps and reflectors |
|
69 | 20 | 5.1× |
| suspension |
|
48 | 13.9 | 8.2× |
| tyres |
|
22 | 6.4 | 4.9× |
| steering |
|
21 | 6.1 | 6.6× |
| audible warning (Horn) |
|
13 | 3.8 | 10.8× |
| wheels |
|
5 | 1.4 | 10.1× |
| Identification of the vehicle |
|
2 | 0.6 | 0.7× |
Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.
How rivals compare
On first-time pass rate the TERRAIN 125 beats 4 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).
Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the TERRAIN 125.
Compare with any bike
More SINNIS models
Pass rate by registration year
Best year to buy used: 2021 (75.3% pass). Weakest: 2022 (70.3%).
First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.
SINNIS TERRAIN 125 FAQ
Is the SINNIS TERRAIN 125 reliable?
The SINNIS TERRAIN 125 is about average for its class: 74.1% of its 660 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4387 of 5428 models.
What does a TERRAIN 125 fail its MOT on most?
brakes — 26% of all defects recorded against failed TERRAIN 125 tests.
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