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 GPR125's first-time pass rate has risen 18.2 points since 2008, 48.5% to 66.7%.
What fails on a GPR125
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| brakes |
|
199 | 22.3 | 3.4× |
| lighting and signalling |
|
187 | 20.9 | 2.8× |
| steering and suspension |
|
156 | 17.4 | 4.0× |
| drive system |
|
94 | 10.5 | 9.2× |
| tyres and wheels |
|
70 | 7.8 | 3.1× |
| body and structure |
|
60 | 6.7 | 9.4× |
| lamps and reflectors |
|
46 | 5.1 | 1.5× |
| structure and attachments |
|
37 | 4.1 | 3.5× |
| fuel and exhaust |
|
27 | 3 | 3.5× |
| suspension |
|
18 | 2 | 1.8× |
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 GPR125 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 GPR125.
Compare with any bike
More DERBI models
Pass rate by registration year
Best year to buy used: 2011 (66.0% pass). Weakest: 2006 (45.8%).
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.
DERBI GPR125 FAQ
Is the DERBI GPR125 reliable?
The DERBI GPR125 is less reliable than average for its class: 59.6% of its 908 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #5227 of 5428 models.
What does a GPR125 fail its MOT on most?
brakes — 22% of all defects recorded against failed GPR125 tests.
What is the best year of GPR125 to buy used?
By first-time pass rate, 2011-registered examples do best (66.0%) and 2006 worst (45.8%). Condition and history still trump the year.
Embed this bike
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