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 GZ 50's first-time pass rate has fallen 11.1 points since 2006, 76.7% to 65.6%.
What fails on a GZ 50
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| brakes |
|
99 | 30.8 | 2.4× |
| steering and suspension |
|
90 | 28 | 3.6× |
| lighting and signalling |
|
71 | 22.1 | 1.7× |
| tyres and wheels |
|
20 | 6.2 | 1.4× |
| body and structure |
|
15 | 4.7 | 3.2× |
| fuel and exhaust |
|
13 | 4 | 2.7× |
| reg plates and vin |
|
6 | 1.9 | 1.8× |
| Items Not Tested |
|
3 | 0.9 | 3.7× |
| tyres |
|
2 | 0.6 | 0.2× |
| structure and attachments |
|
2 | 0.6 | 0.5× |
Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.
How rivals compare
On first-time pass rate the GZ 50 beats 3 of its 4 closest rivals (PEUGEOT SPEEDFIGHT, PIAGGIO ZIP, PIAGGIO NRG).
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 GZ 50.
Compare with any bike
More DAELIM models
Pass rate by registration year
Best year to buy used: 2004 (75.8% pass). Weakest: 2000 (67.6%).
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.
DAELIM GZ 50 FAQ
Is the DAELIM GZ 50 reliable?
The DAELIM GZ 50 is less reliable than average for its class: 71.2% of its 593 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4640 of 5428 models.
What does a GZ 50 fail its MOT on most?
brakes — 31% of all defects recorded against failed GZ 50 tests.
What is the best year of GZ 50 to buy used?
By first-time pass rate, 2004-registered examples do best (75.8%) and 2000 worst (67.6%). Condition and history still trump the year.
Embed this bike
Free to embed on your site, blog or forum — a live Daelim GZ 50 reliability card that stays up to date and links back here. More on the free API page.