Royal Alloy GP 300 S vs Piaggio X9

The Royal Alloy GP 300 S passes its MOT first time more often than the Piaggio X9 — 92.4% vs 77.0%, a 15.4-point lead.

MOT reliability, side by side

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

Metric	Royal Alloy GP 300 S	Piaggio X9
First-time pass rate	92.4%	77.0%
Outright fail rate	5.0%	17.5%
Median miles at test	3,620	12,186
MOT tests analysed	799	21,703
Most common failure	steering	steering and suspension

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.

ROYAL ALLOY GP 300 S 92.4% pass · 799 tests PIAGGIO X9 77.0% pass · 21.7k tests

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