Data as of: DVSA MOT results to 2025
Piaggio B500 vs Kawasaki ER5
The Piaggio B500 passes its MOT first time more often than the Kawasaki ER5: 79.2% vs 77.4%, a 1.8-point lead.
MOT reliability, side by side
| Metric | Piaggio B500 | Kawasaki ER5 |
|---|---|---|
| First-time pass rate | 79.2% | 77.4% |
| Outright fail rate | 14.9% | 14.2% |
| Vs comparable bikes (age & mileage adjusted) | -5.4 pts | -6.2 pts |
| Engine size | 459cc | 498cc |
| Rank among all models | #3734 of 5428 | #3999 of 5428 |
| Median miles at test | 17,496 | 21,259 |
| MOT tests analysed | 1,301 | 53,115 |
| Most common failure | brakes | brakes |
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 | Piaggio B500 | Kawasaki ER5 |
|---|---|---|
| Brakes | 6.3% | 6.0% |
| Lights & signalling | 5.9% | 5.1% |
| Steering & suspension | 5.5% | 5.4% |
| Tyres & wheels | 4.7% | 3.6% |
| Drive system | 0% | 2.3% |
| Structure & body | 0.3% | 1.3% |
| Fuel & exhaust | 0.4% | 0.8% |
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 | Piaggio B500 | Kawasaki ER5 |
|---|---|---|
| 2014 | 85.9% | 73.9% |
| 2015 | 77.0% | 76.4% |
| 2016 | 83.3% | 75.6% |
| 2017 | 74.6% | 75.7% |
| 2018 | 91.4% | 78.3% |
| 2019 | 86.7% | 77.1% |
| 2020 | 83.9% | 79.4% |
| 2021 | 90.0% | 78.2% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | Piaggio B500 | Kawasaki ER5 |
|---|---|---|
| 0k-10k miles | 88.9% | 87.5% |
| 10k-20k miles | 78.9% | 79.5% |
| 20k-30k miles | 76.0% | 75.4% |
| 30k-40k miles | 69.9% | 71.5% |
| 40k-50k miles | 76.5% | 71.1% |
Bands with fewer than 30 tests for either bike are left out.
Piaggio B500 vs Kawasaki ER5 FAQ
Which is more reliable, the Piaggio B500 or the Kawasaki ER5?
The Piaggio B500 passes its MOT first time more often than the Kawasaki ER5: 79.2% vs 77.4%, a 1.8-point lead. Adjusted for age, mileage and test class the two are level (-5.4 vs -6.2 points against comparable bikes), so the raw gap is mostly down to how old and how used each fleet is. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Piaggio B500 fail its MOT on most?
Brakes: 6.3% of Piaggio B500 MOT tests failed on it, then lights & signalling (5.9%).
What does the Kawasaki ER5 fail its MOT on most?
Brakes: 6.0% of Kawasaki ER5 MOT tests failed on it, then steering & suspension (5.4%).
Which holds up better at high mileage, the Piaggio B500 or the Kawasaki ER5?
At 40k-50k miles the Piaggio B500 passes first time more often: 76.5% for the Piaggio B500 vs 71.1% for the Kawasaki ER5.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.