BSA B25SS
Real ownership data from 56 UK B25SS motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common B25SS problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Lights and indicators | fail | 10.7% |
| Other | fail | 8.4% |
| Steering and head bearings | fail | 6.9% |
| Brakes | fail | 6.9% |
| Tyres | fail | 6.1% |
| Suspension | fail | 5.3% |
| Controls and cables | fail | 3.1% |
| Exhaust and emissions | user entered | 3.1% |
Advisories (wear noted but not failed) are excluded above; the most common is suspension.
B25SS 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 | 11 | 8,172 mi | 191 | 80.95% |
| 1971 | 34 | 8,778 mi | 111 | 89.71% |
B25SS questions, answered with data
What are the most common problems with the BSA B25SS?
Across 56 UK examples, the most frequently recorded MOT faults are lights and indicators (10.7% of all recorded faults), other (8.4% of all recorded faults), steering and head bearings (6.9% of all recorded faults).
What is average mileage for a BSA B25SS?
The median BSA B25SS in the UK has covered 8,117 miles, and typically rides about 110 miles a year. Half of all examples fall between 4,292 and 13,622 miles.
Is the BSA B25SS reliable?
88.24% of BSA B25SS MOT tests are passed first time, with an average of 0.5 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 56 BSA B25SS motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.