WHITE KNUCKLE XY
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 XY's first-time pass rate has risen 3.2 points since 2019, 42.5% to 45.7%.
What fails on a XY
| Component group | Share of defects | Defects | % of defects |
|---|---|---|---|
| lamps and reflectors |
|
86 | 28.5 |
| structure and attachments |
|
55 | 18.2 |
| brakes |
|
35 | 11.6 |
| suspension |
|
32 | 10.6 |
| lighting and signalling |
|
29 | 9.6 |
| steering and suspension |
|
22 | 7.3 |
| steering |
|
15 | 5 |
| tyres |
|
13 | 4.3 |
| drive system |
|
8 | 2.6 |
| body and structure |
|
7 | 2.3 |
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 XY 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 XY.
Compare with any bike
More WHITE KNUCKLE models
Pass rate by registration year
Best year to buy used: 2016 (49.3% pass). Weakest: 2016 (49.3%).
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 White Knuckle XY reliability card that stays up to date and links back here. More on the free API page.