Royal Alloy GP 300 S vs Honda Forza 300/350

The Royal Alloy GP 300 S passes its MOT first time more often than the Honda Forza 300/350: 92.4% vs 89.6%, a 2.8-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	Honda Forza 300/350
First-time pass rate	92.4%	89.6%
Outright fail rate	5.0%	7.3%
Vs comparable bikes (age & mileage adjusted)	+3.1 pts	+2.6 pts
Engine size	278cc	279cc
Rank among all models	#405 of 5428	#1077 of 5428
Median miles at test	3,620	9,648
MOT tests analysed	799	10,821
Most common failure	steering	brakes

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 300 S	Honda Forza 300/350
Steering & suspension	2.5%	1.8%
Tyres & wheels	1.3%	2.6%
Brakes	0.1%	3.4%
Lights & signalling	0.9%	1.7%
Structure & body	0.1%	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 300 S	Honda Forza 300/350
2023	92.0%	89.2%
2024	93.0%	90.2%
2025	92.2%	91.8%

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 300 S	Honda Forza 300/350
0k-10k miles	92.5%	94.2%
10k-20k miles	93.0%	87.6%

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

Royal Alloy GP 300 S vs Honda Forza 300/350 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Royal Alloy GP 300 S or the Honda Forza 300/350?

The Royal Alloy GP 300 S passes its MOT first time more often than the Honda Forza 300/350: 92.4% vs 89.6%, a 2.8-point lead. Adjusted for age, mileage and test class the two are level (+3.1 vs +2.6 points against comparable bikes), so the raw gap is mostly down to how old and how used each fleet is. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Royal Alloy GP 300 S fail its MOT on most?

Steering & suspension: 2.5% of Royal Alloy GP 300 S MOT tests failed on it, then tyres & wheels (1.3%).

What does the Honda Forza 300/350 fail its MOT on most?

Brakes: 3.4% of Honda Forza 300/350 MOT tests failed on it, then tyres & wheels (2.6%).

ROYAL ALLOY GP 300 S 92.4% pass · 799 tests HONDA Forza 300/350 89.6% pass · 10.8k tests

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