Data as of: DVSA MOT results to 2025
Znen ZN 50 QT-56 vs Piaggio NRG
The Znen ZN 50 QT-56 passes its MOT first time more often than the Piaggio NRG: 70.0% vs 65.5%, a 4.5-point lead.
MOT reliability, side by side
| Metric | Znen ZN 50 QT-56 | Piaggio NRG |
|---|---|---|
| First-time pass rate | 70.0% | 65.5% |
| Outright fail rate | 19.4% | 27.4% |
| Vs comparable bikes (age & mileage adjusted) | -9.5 pts | -6.0 pts |
| Engine size | 50cc | 49cc |
| Rank among all models | #4735 of 5428 | #4992 of 5428 |
| Median miles at test | 2,888 | 9,874 |
| MOT tests analysed | 506 | 40,458 |
| Most common failure | lamps and reflectors | 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 | Znen ZN 50 QT-56 | Piaggio NRG |
|---|---|---|
| Lights & signalling | 14.0% | 15.0% |
| Steering & suspension | 9.3% | 15.5% |
| Brakes | 4.0% | 10.2% |
| Tyres & wheels | 1.2% | 4.7% |
| Structure & body | 2.0% | 2.5% |
| Fuel & exhaust | 0% | 3.8% |
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 | Znen ZN 50 QT-56 | Piaggio NRG |
|---|---|---|
| 2020 | 73.7% | 71.8% |
| 2021 | 65.8% | 72.9% |
| 2022 | 69.2% | 74.8% |
| 2023 | 67.8% | 77.5% |
| 2024 | 71.7% | 81.9% |
| 2025 | 71.1% | 77.1% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Znen ZN 50 QT-56 vs Piaggio NRG FAQ
Which is more reliable, the Znen ZN 50 QT-56 or the Piaggio NRG?
The Znen ZN 50 QT-56 passes its MOT first time more often than the Piaggio NRG: 70.0% vs 65.5%, a 4.5-point lead. Adjusted for age, mileage and test class, the Piaggio NRG still comes out ahead: -9.5 points vs comparable bikes for the Znen ZN 50 QT-56, -6.0 for the Piaggio NRG. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Znen ZN 50 QT-56 fail its MOT on most?
Lights & signalling: 14.0% of Znen ZN 50 QT-56 MOT tests failed on it, then steering & suspension (9.3%).
What does the Piaggio NRG fail its MOT on most?
Steering & suspension: 15.5% of Piaggio NRG MOT tests failed on it, then lights & signalling (15.0%).
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.