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 CROX 125 E4's first-time pass rate has fallen 1.4 points since 2021, 84.4% to 83.0%.
What fails on a CROX 125 E4
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| brakes |
|
123 | 41.8 | 2.7× |
| lamps and reflectors |
|
77 | 26.2 | 6.1× |
| tyres |
|
33 | 11.2 | 6.9× |
| steering |
|
16 | 5.4 | 6.1× |
| structure and attachments |
|
15 | 5.1 | 2.8× |
| audible warning (Horn) |
|
11 | 3.7 | 9.5× |
| suspension |
|
11 | 3.7 | 2.4× |
| Identification of the vehicle |
|
7 | 2.4 | 4.8× |
| wheels |
|
1 | 0.3 | 2.6× |
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 CROX 125 E4 beats 0 of its 4 closest rivals (PIAGGIO VESPA, HONDA PCX 125, HONDA Vision 110).
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 CROX 125 E4.
Compare with any bike
More SYM models
Pass rate by registration year
Best year to buy used: 2021 (88.2% pass). Weakest: 2018 (73.6%).
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.
SYM CROX 125 E4 FAQ
Is the SYM CROX 125 E4 reliable?
The SYM CROX 125 E4 is more reliable than average for its class: 77.2% of its 635 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4033 of 5428 models.
What does a CROX 125 E4 fail its MOT on most?
brakes — 42% of all defects recorded against failed CROX 125 E4 tests.
What is the best year of CROX 125 E4 to buy used?
By first-time pass rate, 2021-registered examples do best (88.2%) and 2018 worst (73.6%). Condition and history still trump the year.
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