Triumph Bonneville T120
Real ownership data from 10,914 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 |
|---|---|---|
| Other | dangerous | 15.5% |
| Lights and indicators | fail | 13.9% |
| Brakes | fail | 13.1% |
| Suspension | fail | 10.7% |
| Tyres | fail | 9.1% |
| Fluid leaks | fail | 6.8% |
| Steering and head bearings | fail | 6.5% |
| Controls and cables | dangerous | 3.5% |
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 | 369 | — | — | — |
| 2025 | 349 | — | — | — |
| 2024 | 411 | 2,870 mi | — | 100% |
| 2023 | 422 | 3,775 mi | 681 | 95% |
| 2022 | 475 | 4,360 mi | 832 | 92.43% |
| 2021 | 603 | 4,784 mi | 793 | 91.91% |
| 2020 | 821 | 5,188 mi | 723 | 92.35% |
| 2019 | 1,255 | 5,881 mi | 741 | 91.99% |
| 2018 | 1,671 | 7,200 mi | 769 | 91.75% |
| 2017 | 1,901 | 7,426 mi | 691 | 91.68% |
| 2016 | 948 | 9,781 mi | 810 | 92.01% |
| 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 | 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 10,914 UK examples, the most frequently recorded MOT faults are other (15.5% of all recorded faults), lights and indicators (13.9% of all recorded faults), brakes (13.1% of all recorded faults).
What is average mileage for a Triumph Bonneville T120?
The median Triumph Bonneville T120 in the UK has covered 6,516 miles, and typically rides about 657 miles a year. Half of all examples fall between 3,372 and 11,436 miles.
Is the Triumph Bonneville T120 reliable?
91.81% 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 10,914 Triumph Bonneville T120 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.