Triumph Bonneville T120
Real ownership data from 10,994 UK Bonneville T120 motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common Bonneville T120 problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Brakes | fail | 16.9% |
| Suspension | fail | 16.1% |
| Fluid leaks | fail | 10.2% |
| Steering and head bearings | fail | 9.8% |
| Lights and indicators | minor | 4.8% |
| Tyres | dangerous | 4.8% |
| Controls and cables | fail | 4.8% |
| Electrical | major | 4% |
Advisories (wear noted but not failed) are excluded above; the most common is frame and structure.
Bonneville T120 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 | |
|---|---|---|---|---|
| 2026 | 425 | — | — | — |
| 2025 | 351 | — | — | — |
| 2024 | 412 | 2,870 mi | — | 100% |
| 2023 | 424 | 3,775 mi | 1,388 | 94.34% |
| 2022 | 476 | 4,394 mi | 844 | 92.84% |
| 2021 | 604 | 4,944 mi | 776 | 91.85% |
| 2020 | 823 | 5,192 mi | 721 | 92.34% |
| 2019 | 1,258 | 5,970 mi | 744 | 92% |
| 2018 | 1,672 | 7,235 mi | 768 | 91.75% |
| 2017 | 1,905 | 7,442 mi | 691 | 91.7% |
| 2016 | 950 | 9,839 mi | 812 | 92.04% |
| 2015 | 43 | 8,992 mi | 400 | 90.63% |
| 2014 | 28 | 2,266 mi | 90 | 93.59% |
| 2013 | 35 | 1,000 mi | 105 | 91.26% |
| 2012 | 14 | 3,501 mi | 322 | 85.11% |
| 2011 | 18 | 402 mi | 118 | 96% |
| 2010 | 10 | 66 mi | 138 | 92.86% |
| 2009 | 9 | 1,240 mi | 182 | 90.91% |
| 2008 | 6 | 2,092 mi | 422 | 85.71% |
| 2007 | 10 | 799 mi | 49 | 96.15% |
Bonneville T120 questions, answered with data
What are the most common problems with the Triumph Bonneville T120?
Across 10,994 UK examples, the most frequently recorded MOT faults are brakes (16.9% of all recorded faults), suspension (16.1% of all recorded faults), fluid leaks (10.2% of all recorded faults).
What is average mileage for a Triumph Bonneville T120?
The median Triumph Bonneville T120 in the UK has covered 6,552 miles, and typically rides about 657 miles a year. Half of all examples fall between 3,394 and 11,524 miles.
Is the Triumph Bonneville T120 reliable?
91.82% of Triumph Bonneville T120 MOT tests are passed first time, with an average of 0.02 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 10,994 Triumph Bonneville T120 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.