Aprilia SX 50 MY06 vs Piaggio NRG

The Piaggio NRG passes its MOT first time more often than the Aprilia SX 50 MY06: 65.5% vs 55.3%, a 10.2-point lead.

MOT reliability, side by side

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

Metric	Aprilia SX 50 MY06	Piaggio NRG
First-time pass rate	55.3%	65.5%
Outright fail rate	33.8%	27.4%
Vs comparable bikes (age & mileage adjusted)	-14.5 pts	-6.0 pts
Engine size	50cc	49cc
Rank among all models	#5335 of 5428	#4992 of 5428
Median miles at test	11,143	9,874
MOT tests analysed	1,349	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	Aprilia SX 50 MY06	Piaggio NRG
Lights & signalling	25.9%	15.0%
Steering & suspension	15.9%	15.5%
Brakes	13.6%	10.2%
Tyres & wheels	4.8%	4.7%
Drive system	7.6%	0.0%
Structure & body	5.0%	2.5%
Fuel & exhaust	1.6%	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	Aprilia SX 50 MY06	Piaggio NRG
2018	65.8%	69.2%
2019	46.0%	68.0%
2020	63.8%	71.8%
2021	62.9%	72.9%
2022	58.1%	74.8%
2023	66.7%	77.5%
2024	64.5%	81.9%
2025	61.4%	77.1%

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	Aprilia SX 50 MY06	Piaggio NRG
0k-10k miles	56.5%	71.3%
10k-20k miles	56.2%	60.6%
20k-30k miles	58.5%	55.7%

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

Aprilia SX 50 MY06 vs Piaggio NRG FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Aprilia SX 50 MY06 or the Piaggio NRG?

The Piaggio NRG passes its MOT first time more often than the Aprilia SX 50 MY06: 65.5% vs 55.3%, a 10.2-point lead. Adjusted for age, mileage and test class, the Piaggio NRG still comes out ahead: -14.5 points vs comparable bikes for the Aprilia SX 50 MY06, -6.0 for the Piaggio NRG. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Aprilia SX 50 MY06 fail its MOT on most?

Lights & signalling: 25.9% of Aprilia SX 50 MY06 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 Aprilia SX 50 MY06 or the Piaggio NRG?

At 20k-30k miles the Aprilia SX 50 MY06 passes first time more often: 58.5% for the Aprilia SX 50 MY06 vs 55.7% for the Piaggio NRG.

APRILIA SX 50 MY06 55.3% pass · 1,349 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.