BIKERELIABILITY Reg check
League table/ DERBI/GPR
Model report · 2005–2025

DERBI GPR

124cc Petrol Class 1
#5244 of 5428 overall #12 of 19 DERBIs #639 of 734 commuter bikes
59.1%
first-time pass rate
29.3%
failed outright
6,526
median miles at test
629
MOT tests, 2005–2025
-15.0pp
vs expected · age & mileage

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

first-time pass rate by test year · 2010–2022

The GPR's first-time pass rate has risen 9.5 points since 2010, 58.1% to 67.6%.

39%58%77%2010: 58.1% pass (43 tests)2011: 45.0% pass (40 tests)2012: 60.4% pass (48 tests)2013: 48.9% pass (45 tests)2014: 55.8% pass (43 tests)2015: 50.0% pass (38 tests)2016: 62.5% pass (32 tests)2017: 54.5% pass (33 tests)2019: 70.3% pass (37 tests)2020: 65.1% pass (43 tests)2021: 63.0% pass (46 tests)2022: 67.6% pass (37 tests)20102022

What fails on a GPR

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects vs all bikes
lighting and signalling
152 25.5 2.9×
brakes
112 18.8 2.9×
steering and suspension
105 17.6 3.7×
drive system
51 8.5 8.6×
structure and attachments
44 7.4 5.6×
lamps and reflectors
37 6.2 2.5×
body and structure
31 5.2 7.3×
tyres and wheels
27 4.5 1.8×
suspension
26 4.4 4.3×
fuel and exhaust
12 2 2.3×

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

same type, similar capacity, high test volume

On first-time pass rate the GPR beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests Compare head-to-head →
HONDA CG125 72.2% pass · 89.3k tests Compare head-to-head →
HONDA CBF125 73.3% pass · 84.4k tests Compare head-to-head →
GILERA RUNNER 70.8% pass · 69.9k tests Compare head-to-head →

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 GPR.

Compare with any bike

rival not listed above? pick any model to see it head-to-head with the GPR

More DERBI models

other DERBI bikes ranked by MOT pass rate
DERBI SENDA 55.0% pass · 9,050 tests
DERBI GPR50-R 53.4% pass · 1,901 tests
DERBI GPR 50 54.7% pass · 1,847 tests
DERBI ATLANTIS 73.4% pass · 1,505 tests
DERBI PREDATOR 66.3% pass · 1,298 tests
DERBI SENDA SM 51.1% pass · 1,013 tests

See all DERBI models →

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2016 (69.3% pass). Weakest: 2008 (53.8%).

51%62%72%2005: 54.0% pass (139 tests)2006: 56.1% pass (82 tests)2007: 57.6% pass (59 tests)2008: 53.8% pass (52 tests)2016: 69.3% pass (127 tests)200520072016

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 GPR FAQ

answers computed from the data above · terms in the glossary

Is the DERBI GPR reliable?

The DERBI GPR is less reliable than average for its class: 59.1% of its 629 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #5244 of 5428 models.

What does a GPR fail its MOT on most?

lighting and signalling — 25% of all defects recorded against failed GPR tests.

What is the best year of GPR to buy used?

By first-time pass rate, 2016-registered examples do best (69.3%) and 2008 worst (53.8%). Condition and history still trump the year.

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