BSA B25
Real ownership data from 202 UK B25 motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common B25 problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Lights and indicators | fail | 10.4% |
| Other | fail | 7.8% |
| Brakes | fail | 6.9% |
| Tyres | major | 3.7% |
| Steering and head bearings | fail | 3% |
| Fluid leaks | dangerous | 2.8% |
| Suspension | fail | 2.4% |
| Controls and cables | user entered | 2.1% |
Advisories (wear noted but not failed) are excluded above; the most common is suspension.
B25 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 |
|---|---|---|---|---|
| 1972 | 17 | 11,142 mi | 74 | 91.36% |
| 1971 | 22 | 11,804 mi | 254 | 88.11% |
| 1970 | 32 | 8,715 mi | 218 | 92.59% |
| 1969 | 35 | 3,930 mi | 246 | 90% |
| 1968 | 39 | 11,270 mi | 147 | 89.53% |
| 1967 | 6 | 5,278 mi | 86 | 87.5% |
B25 questions, answered with data
What are the most common problems with the BSA B25?
Across 202 UK examples, the most frequently recorded MOT faults are lights and indicators (10.4% of all recorded faults), other (7.8% of all recorded faults), brakes (6.9% of all recorded faults).
What is average mileage for a BSA B25?
The median BSA B25 in the UK has covered 9,216 miles, and typically rides about 173 miles a year. Half of all examples fall between 2,302 and 19,592 miles.
Is the BSA B25 reliable?
89.14% of BSA B25 MOT tests are passed first time, with an average of 0.56 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 202 BSA B25 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.