DERBI TERRA 125
Pass rate over time
The TERRA 125's first-time pass rate has held steady since 2012 (66.1% → 65.5%).
What fails on a TERRA 125
| Component group | Share of defects | Defects | % of defects | vs all bikes |
|---|---|---|---|---|
| brakes |
|
104 | 24.5 | 2.7× |
| lighting and signalling |
|
104 | 24.5 | 2.4× |
| steering and suspension |
|
72 | 16.9 | 2.9× |
| drive system |
|
47 | 11.1 | 8.8× |
| lamps and reflectors |
|
30 | 7.1 | 1.9× |
| structure and attachments |
|
19 | 4.5 | 2.1× |
| tyres and wheels |
|
18 | 4.2 | 1.2× |
| suspension |
|
16 | 3.8 | 3.1× |
| fuel and exhaust |
|
9 | 2.1 | 1.9× |
| driving controls |
|
6 | 1.4 | 3.5× |
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 TERRA 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 TERRA 125.
Pass rate by registration year
Best year to buy used: 2008 (70.8% pass). Weakest: 2011 (55.7%).
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.
DERBI TERRA 125 FAQ
Is the DERBI TERRA 125 reliable?
The DERBI TERRA 125 is less reliable than average for its class: 67.7% of its 613 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4873 of 5426 models.
What does a TERRA 125 fail its MOT on most?
brakes — 24% of all defects recorded against failed TERRA 125 tests.
What is the best year of TERRA 125 to buy used?
By first-time pass rate, 2008-registered examples do best (70.8%) and 2011 worst (55.7%). Condition and history still trump the year.