Sinnis Terrain 125
Real ownership data from 2,309 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 |
|---|---|---|
| Brakes | minor | 15% |
| Frame and structure | dangerous | 9.8% |
| Steering and head bearings | major | 6.8% |
| Wheels | dangerous | 6.8% |
| Controls and cables | dangerous | 6.4% |
| Tyres | major | 5.3% |
| Brake discs and pads | major | 5.3% |
| Lights and indicators | dangerous | 3% |
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 | 6,160 mi | 2,577 | 65.75% |
| 2022 | 346 | 6,108 mi | 1,655 | 72.26% |
| 2021 | 588 | 7,174 mi | 1,548 | 73.43% |
| 2020 | 363 | 8,140 mi | 1,463 | 73.65% |
| 2019 | 264 | 9,872 mi | 1,572 | 69.15% |
| 2018 | 277 | 11,569 mi | 1,717 | 68.51% |
| 2017 | 183 | 10,596 mi | 1,507 | 72.74% |
Terrain 125 questions, answered with data
What are the most common problems with the Sinnis Terrain 125?
Across 2,309 UK examples, the most frequently recorded MOT faults are brakes (15% of all recorded faults), frame and structure (9.8% of all recorded faults), steering and head bearings (6.8% of all recorded faults).
What is average mileage for a Sinnis Terrain 125?
The median Sinnis Terrain 125 in the UK has covered 8,242 miles, and typically rides about 1,572 miles a year. Half of all examples fall between 4,416 and 13,724 miles.
Is the Sinnis Terrain 125 reliable?
71.54% of Sinnis Terrain 125 MOT tests are passed first time, with an average of 0.05 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 2,309 Sinnis Terrain 125 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.