Royal Alloy GP 200 LC vs Lambretta GP150

The Royal Alloy GP 200 LC passes its MOT first time more often than the Lambretta GP150: 89.6% vs 87.6%, a 2.0-point lead.

MOT reliability, side by side

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

Metric	Royal Alloy GP 200 LC	Lambretta GP150
First-time pass rate	89.6%	87.6%
Outright fail rate	5.8%	7.2%
Vs comparable bikes (age & mileage adjusted)	+9.6 pts	+3.2 pts
Engine size	181cc	148cc
Rank among all models	#1077 of 5428	#1725 of 5428
Median miles at test	2,707	1,735
MOT tests analysed	743	12,123
Most common failure	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	Royal Alloy GP 200 LC	Lambretta GP150
Lights & signalling	1.7%	4.2%
Steering & suspension	3.5%	2.3%
Brakes	0.5%	2.7%
Tyres & wheels	1.3%	0.9%
Structure & body	0.1%	0.4%
Fuel & exhaust	0%	0.4%

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	Royal Alloy GP 200 LC	Lambretta GP150
2021	79.4%	89.7%
2022	88.1%	91.0%
2023	91.0%	92.5%
2024	87.9%	94.5%
2025	92.9%	96.2%

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	Royal Alloy GP 200 LC	Lambretta GP150
0k-10k miles	89.9%	87.2%
10k-20k miles	90.0%	89.3%

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

Royal Alloy GP 200 LC vs Lambretta GP150 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Royal Alloy GP 200 LC or the Lambretta GP150?

The Royal Alloy GP 200 LC passes its MOT first time more often than the Lambretta GP150: 89.6% vs 87.6%, a 2.0-point lead. Adjusted for age, mileage and test class, the Royal Alloy GP 200 LC still comes out ahead: +9.6 points vs comparable bikes for the Royal Alloy GP 200 LC, +3.2 for the Lambretta GP150. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Royal Alloy GP 200 LC fail its MOT on most?

Steering & suspension: 3.5% of Royal Alloy GP 200 LC MOT tests failed on it, then lights & signalling (1.7%).

What does the Lambretta GP150 fail its MOT on most?

Lights & signalling: 4.2% of Lambretta GP150 MOT tests failed on it, then brakes (2.7%).

ROYAL ALLOY GP 200 LC 89.6% pass · 743 tests LAMBRETTA GP150 87.6% pass · 12.1k tests

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