DERBI GPR50-R

49cc Petrol Class 1

#5354 of 5426 overall #16 of 19 DERBIs #418 of 455 moped bikes

53.4%

first-time pass rate

37.2%

failed outright

13,707

median miles at test

1,901

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2020

The GPR50-R's first-time pass rate has risen 12.5 points since 2006, 54.2% to 66.7%.

Pass rate by mileage

how the GPR50-R's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage GPR50-R passes first time 57.7% of the time; by 30k that's 50.4%.

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 GPR50-R

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	994	33.9	6.3×
steering and suspension	817	27.8	7.8×
brakes	473	16.1	3.7×
drive system	226	7.7	12.6×
body and structure	145	4.9	12.1×
tyres and wheels	105	3.6	2.3×
fuel and exhaust	70	2.4	4.6×
lamps and reflectors	47	1.6	0.7×
driving controls	30	1	6.5×
reg plates and vin	28	1	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 GPR50-R beats 0 of its 4 closest rivals (PEUGEOT SPEEDFIGHT, PIAGGIO ZIP, PIAGGIO NRG).

PEUGEOT SPEEDFIGHT 65.2% pass · 83.7k tests PIAGGIO ZIP 71.3% pass · 79.0k tests PIAGGIO NRG 65.5% pass · 40.5k tests PEUGEOT VIVACITY 70.4% pass · 29.7k tests

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 GPR50-R.

Pass rate by registration year

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

Best year to buy used: 1999 (59.3% pass). Weakest: 2004 (46.7%).

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 GPR50-R FAQ

answers computed from the data above · terms in the glossary

Is the DERBI GPR50-R reliable?

The DERBI GPR50-R is less reliable than average for its class: 53.4% of its 1,901 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #5354 of 5426 models.

What does a GPR50-R fail its MOT on most?

lighting and signalling — 34% of all defects recorded against failed GPR50-R tests.

What is the best year of GPR50-R to buy used?

By first-time pass rate, 1999-registered examples do best (59.3%) and 2004 worst (46.7%). Condition and history still trump the year.

How many miles will a GPR50-R last?

The median GPR50-R shows 13,707 miles at test, and examples around 30k miles still pass 50.4% of the time — mileage alone rarely kills one.