Head-to-head · 2005–2025
Data as of: DVSA MOT results to 2025
Keeway Swan 50 vs Piaggio Zip
The Piaggio Zip passes its MOT first time more often than the Keeway Swan 50: 71.3% vs 67.6%, a 3.7-point lead.
MOT reliability, side by side
first-time pass rate, outright fail rate and tests analysed · 2005–2025
| Metric | Keeway Swan 50 | Piaggio Zip |
|---|---|---|
| First-time pass rate | 67.6% | 71.3% |
| Outright fail rate | 25.4% | 20.4% |
| Vs comparable bikes (age & mileage adjusted) | -7.3 pts | -1.0 pts |
| Engine size | 49cc | 49cc |
| Median miles at test | 5,497 | 8,882 |
| MOT tests analysed | 142 | 78,993 |
| Most common failure | lighting and signalling | lighting and signalling |
First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.
"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.