Rieju MRX 50 vs Piaggio NRG

The Piaggio NRG passes its MOT first time more often than the Rieju MRX 50: 65.5% vs 51.9%, a 13.6-point lead.

MOT reliability, side by side

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

Metric	Rieju MRX 50	Piaggio NRG
First-time pass rate	51.9%	65.5%
Outright fail rate	40.3%	27.4%
Vs comparable bikes (age & mileage adjusted)	-19.6 pts	-6.0 pts
Engine size	49cc	49cc
Rank among all models	#5382 of 5428	#4992 of 5428
Median miles at test	10,602	9,874
MOT tests analysed	397	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.

Pass rate by test year

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

Test year	Rieju MRX 50	Piaggio NRG
2006	60.6%	64.7%
2007	45.7%	63.9%
2008	54.9%	65.2%
2009	37.1%	62.2%
2011	41.2%	63.9%
2012	59.4%	63.4%
2013	50.0%	64.1%
2014	40.0%	67.4%

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	Rieju MRX 50	Piaggio NRG
0k-10k miles	59.0%	71.3%
10k-20k miles	44.3%	60.6%
20k-30k miles	45.2%	55.7%

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

RIEJU MRX 50 51.9% pass · 397 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.