Royal Alloy GP 125 S LC vs Piaggio Vespa

The Royal Alloy GP 125 S LC passes its MOT first time more often than the Piaggio Vespa: 88.1% vs 80.7%, a 7.4-point lead.

MOT reliability, side by side

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

Metric	Royal Alloy GP 125 S LC	Piaggio Vespa
First-time pass rate	88.1%	80.7%
Outright fail rate	9.6%	12.2%
Vs comparable bikes (age & mileage adjusted)	+8.8 pts	+5.9 pts
Engine size	125cc	124cc
Median miles at test	2,669	10,023
MOT tests analysed	177	287,482
Most common failure	steering	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	Royal Alloy GP 125 S LC	Piaggio Vespa
2023	80.5%	86.5%
2024	91.0%	87.2%
2025	89.2%	87.4%

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

ROYAL ALLOY GP 125 S LC 88.1% pass · 177 tests PIAGGIO VESPA 80.7% pass · 287k tests

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