Gilera Dna 50 vs Piaggio NRG

The Piaggio NRG passes its MOT first time more often than the Gilera Dna 50: 65.5% vs 61.6%, a 3.9-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	Gilera Dna 50	Piaggio NRG
First-time pass rate	61.6%	65.5%
Outright fail rate	31.1%	27.4%
Vs comparable bikes (age & mileage adjusted)	-10.9 pts	-6.0 pts
Engine size	49cc	49cc
Rank among all models	#5160 of 5428	#4992 of 5428
Median miles at test	7,116	9,874
MOT tests analysed	1,502	40,458
Most common failure	lighting and signalling	lighting and signalling

First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	Gilera Dna 50	Piaggio NRG
Lights & signalling	21.2%	15.0%
Steering & suspension	15.9%	15.5%
Brakes	9.5%	10.2%
Tyres & wheels	5.4%	4.7%
Structure & body	6.7%	2.5%
Fuel & exhaust	4.7%	3.8%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Gilera Dna 50	Piaggio NRG
2009	58.2%	62.2%
2010	69.8%	63.2%
2011	66.2%	63.9%
2012	50.0%	63.4%
2013	50.0%	64.1%
2014	76.5%	67.4%
2015	59.5%	68.8%
2016	34.3%	68.0%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Gilera Dna 50	Piaggio NRG
0k-10k miles	66.1%	71.3%
10k-20k miles	55.0%	60.6%
20k-30k miles	51.5%	55.7%

Bands with fewer than 30 tests for either bike are left out.

Gilera Dna 50 vs Piaggio NRG FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Gilera Dna 50 or the Piaggio NRG?

The Piaggio NRG passes its MOT first time more often than the Gilera Dna 50: 65.5% vs 61.6%, a 3.9-point lead. Adjusted for age, mileage and test class, the Piaggio NRG still comes out ahead: -10.9 points vs comparable bikes for the Gilera Dna 50, -6.0 for the Piaggio NRG. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Gilera Dna 50 fail its MOT on most?

Lights & signalling: 21.2% of Gilera Dna 50 MOT tests failed on it, then steering & suspension (15.9%).

What does the Piaggio NRG fail its MOT on most?

Steering & suspension: 15.5% of Piaggio NRG MOT tests failed on it, then lights & signalling (15.0%).

Which holds up better at high mileage, the Gilera Dna 50 or the Piaggio NRG?

At 20k-30k miles the Piaggio NRG passes first time more often: 51.5% for the Gilera Dna 50 vs 55.7% for the Piaggio NRG.

GILERA DNA 50 61.6% pass · 1,502 tests PIAGGIO NRG 65.5% pass · 40.5k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.