Sinnis Terrain 125
Real ownership data from 2,313 UK Terrain 125 motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common Terrain 125 problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Brake discs and pads | major | 10.3% |
| Frame and structure | dangerous | 7.1% |
| Brakes | major | 7.1% |
| Fork seals | major | 4.8% |
| Steering and head bearings | dangerous | 3.2% |
| Lights and indicators | dangerous | 3.2% |
| Controls and cables | major | 2.4% |
| Suspension | dangerous | 2.4% |
Advisories (wear noted but not failed) are excluded above; the most common is fork seals.
Terrain 125 mileage and reliability by year
Use this to judge whether a specific bike is high or low mileage for its age.
| YearYear | MedianMedian mileage | Mi/yrMiles/year | MOT passFirst-time pass | |
|---|---|---|---|---|
| 2025 | 8 | — | — | — |
| 2024 | 74 | 20,396 mi | — | 100% |
| 2023 | 203 | 6,234 mi | 2,794 | 62.2% |
| 2022 | 347 | 6,136 mi | 1,602 | 72.46% |
| 2021 | 589 | 7,544 mi | 1,554 | 72.91% |
| 2020 | 363 | 8,202 mi | 1,416 | 73.93% |
| 2019 | 265 | 9,872 mi | 1,565 | 69.12% |
| 2018 | 278 | 11,661 mi | 1,729 | 68.6% |
| 2017 | 183 | 10,698 mi | 1,500 | 72.43% |
Terrain 125 questions, answered with data
What are the most common problems with the Sinnis Terrain 125?
Across 2,313 UK examples, the most frequently recorded MOT faults are brake discs and pads (10.3% of all recorded faults), frame and structure (7.1% of all recorded faults), brakes (7.1% of all recorded faults).
What is average mileage for a Sinnis Terrain 125?
The median Sinnis Terrain 125 in the UK has covered 8,404 miles, and typically rides about 1,572 miles a year. Half of all examples fall between 4,443 and 13,802 miles.
Is the Sinnis Terrain 125 reliable?
71.38% of Sinnis Terrain 125 MOT tests are passed first time, with an average of 0.03 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 2,313 Sinnis Terrain 125 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.