MUTT MONGREL 125
Pass rate over time
The MONGREL 125's first-time pass rate has risen 11.7 points since 2019, 57.1% to 68.8%.
Pass rate by mileage
A low-mileage MONGREL 125 passes first time 68.3% of the time; by 20k that's 62.7%.
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 MONGREL 125
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| lamps and reflectors |
|
770 | 39.3 | 8.0× |
| brakes |
|
515 | 26.3 | 2.1× |
| structure and attachments |
|
273 | 13.9 | 7.6× |
| suspension |
|
139 | 7.1 | 4.7× |
| tyres |
|
84 | 4.3 | 3.1× |
| steering |
|
83 | 4.2 | 4.7× |
| Identification of the vehicle |
|
42 | 2.1 | 5.2× |
| audible warning (Horn) |
|
39 | 2 | 6.0× |
| wheels |
|
14 | 0.7 | 5.2× |
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 MONGREL 125 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 MONGREL 125.
Pass rate by registration year
Best year to buy used: 2022 (74.4% pass). Weakest: 2016 (62.9%).
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.
MUTT MONGREL 125 FAQ
Is the MUTT MONGREL 125 reliable?
The MUTT MONGREL 125 is less reliable than average for its class: 69.0% of its 3,527 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4797 of 5426 models.
What does a MONGREL 125 fail its MOT on most?
lamps and reflectors — 39% of all defects recorded against failed MONGREL 125 tests.
What is the best year of MONGREL 125 to buy used?
By first-time pass rate, 2022-registered examples do best (74.4%) and 2016 worst (62.9%). Condition and history still trump the year.
How many miles will a MONGREL 125 last?
The median MONGREL 125 shows 3,762 miles at test, and examples around 20k miles still pass 62.7% of the time — mileage alone rarely kills one.