The pass rate is the MOT first-time pass: a roadworthiness check of the items an MOT covers (brakes, lights, tyres, steering, structure, emissions), not a full mechanical inspection of engine or gearbox internals. It is a reliability signal, not a complete measure of mechanical reliability. What this measures.
“vs expected” adjusts for age, mileage and test class, so a cherished classic and a hard-used commuter are compared fairly. How this works.
Pass rate over time
The ZZ's first-time pass rate has risen 9.7 points since 2019, 52.8% to 62.5%.
What fails on a ZZ
| Component group | Share of defects | Defects | % of defects |
|---|---|---|---|
| lamps and reflectors |
|
88 | 28.9 |
| brakes |
|
61 | 20 |
| structure and attachments |
|
59 | 19.3 |
| suspension |
|
47 | 15.4 |
| lighting and signalling |
|
16 | 5.2 |
| steering |
|
10 | 3.3 |
| Identification of the vehicle |
|
6 | 2 |
| audible warning (Horn) |
|
6 | 2 |
| drive system |
|
6 | 2 |
| steering and suspension |
|
6 | 2 |
Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.
How rivals compare
On first-time pass rate the ZZ beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).
Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the ZZ.
Compare with any bike
More SFM models
Pass rate by registration year
Best year to buy used: 2015 (72.0% pass). Weakest: 2016 (46.8%).
First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.
Embed this bike
Free to embed on your site, blog or forum — a live SFM ZZ reliability card that stays up to date and links back here. More on the free API page.