Triumph TWENTY ONE
Real ownership data from 180 UK TWENTY ONE motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common TWENTY ONE problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Brakes | major | 9.3% |
| Lights and indicators | fail | 7.9% |
| Fluid leaks | user entered | 4.3% |
| Tyres | fail | 4.3% |
| Steering and head bearings | major | 4.1% |
| Controls and cables | fail | 2.4% |
| Other | user entered | 2.2% |
| Suspension | fail | 1.9% |
Advisories (wear noted but not failed) are excluded above; the most common is suspension.
TWENTY ONE 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 |
|---|---|---|---|---|
| 1966 | 7 | 15,179 mi | 61 | 97.67% |
| 1965 | 11 | 36,958 mi | 98 | 97.73% |
| 1964 | 11 | 44,754 mi | 147 | 89.66% |
| 1963 | 14 | 12,864 mi | 50 | 91.86% |
| 1962 | 13 | 7,094 mi | 113 | 91.25% |
| 1961 | 22 | 15,064 mi | 152 | 90.91% |
| 1960 | 16 | 3,462 mi | 80 | 96.72% |
| 1959 | 12 | 10,380 mi | 31 | 87.8% |
| 1958 | 22 | 13,266 mi | 51 | 90% |
| 1957 | 5 | 32,786 mi | 250 | 88.46% |
TWENTY ONE questions, answered with data
What are the most common problems with the Triumph TWENTY ONE?
Across 180 UK examples, the most frequently recorded MOT faults are brakes (9.3% of all recorded faults), lights and indicators (7.9% of all recorded faults), fluid leaks (4.3% of all recorded faults).
What is average mileage for a Triumph TWENTY ONE?
The median Triumph TWENTY ONE in the UK has covered 16,283 miles, and typically rides about 76 miles a year. Half of all examples fall between 4,190 and 41,432 miles.
Is the Triumph TWENTY ONE reliable?
92.33% of Triumph TWENTY ONE MOT tests are passed first time, with an average of 0.45 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 180 Triumph TWENTY ONE motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.