Data as of: DVSA MOT results to 2025
Pgo Comet vs Piaggio Zip
The Piaggio Zip passes its MOT first time more often than the Pgo Comet: 71.3% vs 65.9%, a 5.4-point lead.
MOT reliability, side by side
| Metric | Pgo Comet | Piaggio Zip |
|---|---|---|
| First-time pass rate | 65.9% | 71.3% |
| Outright fail rate | 23.2% | 20.4% |
| Vs comparable bikes (age & mileage adjusted) | -7.5 pts | -1.0 pts |
| Engine size | 49cc | 49cc |
| Rank among all models | #4974 of 5428 | #4631 of 5428 |
| Median miles at test | 7,352 | 8,882 |
| MOT tests analysed | 504 | 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.
What fails, side by side
| Component | Pgo Comet | Piaggio Zip |
|---|---|---|
| Lights & signalling | 18.3% | 11.9% |
| Steering & suspension | 4.8% | 9.2% |
| Brakes | 7.1% | 6.5% |
| Tyres & wheels | 2.6% | 4.0% |
| Fuel & exhaust | 3.8% | 2.5% |
| Structure & body | 2.4% | 1.6% |
A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.
Pass rate by test year
| Test year | Pgo Comet | Piaggio Zip |
|---|---|---|
| 2006 | 72.3% | 73.7% |
| 2007 | 70.2% | 71.0% |
| 2008 | 57.4% | 72.4% |
| 2009 | 63.3% | 70.0% |
| 2010 | 67.5% | 70.8% |
| 2011 | 62.5% | 69.7% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | Pgo Comet | Piaggio Zip |
|---|---|---|
| 0k-10k miles | 65.7% | 75.2% |
| 10k-20k miles | 68.9% | 66.7% |
Bands with fewer than 30 tests for either bike are left out.
Pgo Comet vs Piaggio Zip FAQ
Which is more reliable, the Pgo Comet or the Piaggio Zip?
The Piaggio Zip passes its MOT first time more often than the Pgo Comet: 71.3% vs 65.9%, a 5.4-point lead. Adjusted for age, mileage and test class, the Piaggio Zip still comes out ahead: -7.5 points vs comparable bikes for the Pgo Comet, -1.0 for the Piaggio Zip. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Pgo Comet fail its MOT on most?
Lights & signalling: 18.3% of Pgo Comet MOT tests failed on it, then brakes (7.1%).
What does the Piaggio Zip fail its MOT on most?
Lights & signalling: 11.9% of Piaggio Zip MOT tests failed on it, then steering & suspension (9.2%).
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.