Data as of: DVSA MOT results to 2025
Vespa (douglas) PK vs Piaggio Zip
The Vespa (douglas) PK passes its MOT first time more often than the Piaggio Zip: 75.5% vs 71.3%, a 4.2-point lead.
MOT reliability, side by side
| Metric | Vespa (douglas) PK | Piaggio Zip |
|---|---|---|
| First-time pass rate | 75.5% | 71.3% |
| Outright fail rate | 18.4% | 20.4% |
| Vs comparable bikes (age & mileage adjusted) | -4.4 pts | -1.0 pts |
| Engine size | 50cc | 49cc |
| Rank among all models | #4245 of 5428 | #4631 of 5428 |
| Median miles at test | 10,305 | 8,882 |
| MOT tests analysed | 277 | 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.
Pass rate by mileage
| Mileage | Vespa (douglas) PK | Piaggio Zip |
|---|---|---|
| 0k-10k miles | 75.0% | 75.2% |
| 10k-20k miles | 78.6% | 66.7% |
| 20k-30k miles | 71.7% | 64.4% |
Bands with fewer than 30 tests for either bike are left out.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.