Triumph Bonneville T120
Real ownership data from 10,839 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 | dangerous | 1.9% |
| Brake discs and pads | dangerous | 1.4% |
| Tyres | major | 1.1% |
| Other | fail | 1% |
| Lights and indicators | dangerous | 1% |
| Electrical | fail | 0.9% |
| Suspension | major | 0.9% |
| Steering and head bearings | fail | 0.7% |
Advisories (wear noted but not failed) are excluded above; the most common is suspension.
Bonneville T120 mileage and reliability by year
Use this to judge whether a specific bike is high or low mileage for its age.
| Year | Examples | Median mileage | Miles/year | First-time pass |
|---|---|---|---|---|
| 2026 | 328 | — | — | — |
| 2025 | 348 | — | — | — |
| 2024 | 410 | 2,870 mi | — | 100% |
| 2023 | 421 | 3,889 mi | 681 | 95.24% |
| 2022 | 470 | 4,135 mi | 817 | 92.04% |
| 2021 | 600 | 4,669 mi | 804 | 91.67% |
| 2020 | 819 | 5,154 mi | 721 | 92.28% |
| 2019 | 1,253 | 5,829 mi | 738 | 91.94% |
| 2018 | 1,663 | 7,200 mi | 772 | 91.74% |
| 2017 | 1,896 | 7,360 mi | 690 | 91.67% |
| 2016 | 945 | 9,763 mi | 810 | 91.95% |
| 2015 | 43 | 8,992 mi | 400 | 90.55% |
| 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 | 19 | 402 mi | 118 | 96.15% |
| 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 10,839 UK examples, the most frequently recorded MOT faults are brakes (1.9% of all recorded faults), brake discs and pads (1.4% of all recorded faults), tyres (1.1% of all recorded faults).
What is average mileage for a Triumph Bonneville T120?
The median Triumph Bonneville T120 in the UK has covered 6,451 miles, and typically rides about 654 miles a year. Half of all examples fall between 3,333 and 11,370 miles.
Is the Triumph Bonneville T120 reliable?
91.77% of Triumph Bonneville T120 MOT tests are passed first time, with an average of 0.37 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 10,839 Triumph Bonneville T120 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.