Moto Roma Wasp vs Piaggio NRG

The Moto Roma Wasp passes its MOT first time more often than the Piaggio NRG: 75.2% vs 65.5%, a 9.7-point lead.

MOT reliability, side by side

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

Metric	Moto Roma Wasp	Piaggio NRG
First-time pass rate	75.2%	65.5%
Outright fail rate	18.2%	27.4%
Vs comparable bikes (age & mileage adjusted)	+1.7 pts	-6.0 pts
Engine size	49cc	49cc
Rank among all models	#4276 of 5428	#4992 of 5428
Median miles at test	7,176	9,874
MOT tests analysed	581	40,458
Most common failure	steering and suspension	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	Moto Roma Wasp	Piaggio NRG
Steering & suspension	10.7%	15.5%
Lights & signalling	7.9%	15.0%
Brakes	6.9%	10.2%
Tyres & wheels	1.7%	4.7%
Fuel & exhaust	2.6%	3.8%
Structure & body	1.7%	2.5%

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	Moto Roma Wasp	Piaggio NRG
2006	76.0%	64.7%
2007	76.1%	63.9%
2008	73.4%	65.2%
2009	77.6%	62.2%
2010	86.5%	63.2%
2011	63.3%	63.9%
2012	74.2%	63.4%

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	Moto Roma Wasp	Piaggio NRG
0k-10k miles	78.5%	71.3%
10k-20k miles	66.3%	60.6%

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

Moto Roma Wasp vs Piaggio NRG FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Moto Roma Wasp or the Piaggio NRG?

The Moto Roma Wasp passes its MOT first time more often than the Piaggio NRG: 75.2% vs 65.5%, a 9.7-point lead. Adjusted for age, mileage and test class, the Moto Roma Wasp still comes out ahead: +1.7 points vs comparable bikes for the Moto Roma Wasp, -6.0 for the Piaggio NRG. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Moto Roma Wasp fail its MOT on most?

Steering & suspension: 10.7% of Moto Roma Wasp MOT tests failed on it, then lights & signalling (7.9%).

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%).

MOTO ROMA WASP 75.2% pass · 581 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.