DERBI X-RACE 50 SM
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 X-RACE 50 SM's first-time pass rate has fallen 22.9 points since 2013, 61.4% to 38.5%.
What fails on a X-RACE 50 SM
| Component group | Share of defects | Defects | % of defects |
|---|---|---|---|
| lighting and signalling |
|
168 | 37.9 |
| brakes |
|
80 | 18.1 |
| steering and suspension |
|
52 | 11.7 |
| lamps and reflectors |
|
36 | 8.1 |
| drive system |
|
32 | 7.2 |
| suspension |
|
20 | 4.5 |
| structure and attachments |
|
19 | 4.3 |
| reg plates and vin |
|
19 | 4.3 |
| tyres and wheels |
|
10 | 2.3 |
| steering |
|
7 | 1.6 |
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 X-RACE 50 SM beats 0 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 X-RACE 50 SM.
Compare with any bike
More DERBI models
Pass rate by registration year
Best year to buy used: 2010 (57.1% pass). Weakest: 2009 (51.7%).
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.
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