Data as of: DVSA MOT results to 2025
HARLEY-DAVIDSON CUSTOM
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 CUSTOM's first-time pass rate has fallen 1.4 points since 2006, 88.2% to 86.8%.
Pass rate by mileage
A low-mileage CUSTOM passes first time 84.9% of the time; by 50k that's 93.8%.
First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.
What fails on a CUSTOM
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| lighting and signalling |
|
101 | 32.5 | 0.7× |
| brakes |
|
59 | 19 | 0.6× |
| steering and suspension |
|
44 | 14.1 | 0.6× |
| reg plates and vin |
|
36 | 11.6 | 2.5× |
| lamps and reflectors |
|
21 | 6.8 | 0.4× |
| tyres and wheels |
|
15 | 4.8 | 0.4× |
| fuel and exhaust |
|
15 | 4.8 | 1.1× |
| body and structure |
|
8 | 2.6 | 0.9× |
| structure and attachments |
|
7 | 2.3 | 0.5× |
| steering |
|
5 | 1.6 | 0.4× |
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 CUSTOM beats 0 of its 4 closest rivals (HARLEY-DAVIDSON FLSTF, HARLEY-DAVIDSON FLSTC, HARLEY-DAVIDSON XL1200C).
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 CUSTOM.
Compare with any bike
More HARLEY-DAVIDSON models
Pass rate by registration year
Highest pass rate: 1975 (91.1%). Lowest: 2000 (78.8%). Every Custom year compared →
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.
HARLEY-DAVIDSON CUSTOM FAQ
Is the HARLEY-DAVIDSON CUSTOM reliable?
The HARLEY-DAVIDSON CUSTOM is about average for its class: 85.7% of its 1,619 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #2308 of 5428 models.
What does a CUSTOM fail its MOT on most?
lighting and signalling: 32% of all defects recorded against failed CUSTOM tests.
What is the best year of CUSTOM to buy used?
By first-time pass rate, 1975-registered examples do best (91.1%) and 2000 worst (78.8%). Condition and history still trump the year.
How many miles will a CUSTOM last?
The median CUSTOM shows 9,228 miles at test, and examples around 50k miles still pass 93.8% of the time, so mileage alone rarely decides the result.
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