Aprilia RS125R vs Honda CG125

The Honda CG125 passes its MOT first time more often than the Aprilia RS125R: 72.2% vs 59.1%, a 13.1-point lead.

MOT reliability, side by side

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

Metric	Aprilia RS125R	Honda CG125
First-time pass rate	59.1%	72.2%
Outright fail rate	30.7%	16.8%
Vs comparable bikes (age & mileage adjusted)	-11.3 pts	+0.7 pts
Engine size	125cc	124cc
Rank among all models	#5244 of 5428	#4568 of 5428
Median miles at test	15,340	17,460
MOT tests analysed	2,726	89,345
Most common failure	lighting and signalling	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	Aprilia RS125R	Honda CG125
Lights & signalling	18.2%	10.0%
Steering & suspension	16.3%	7.2%
Brakes	11.8%	5.1%
Tyres & wheels	5.4%	4.6%
Drive system	5.5%	2.6%
Structure & body	5.7%	1.9%
Fuel & exhaust	2.9%	0.9%

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	Aprilia RS125R	Honda CG125
2018	71.4%	72.6%
2019	66.7%	71.8%
2020	68.6%	73.6%
2021	68.9%	73.9%
2022	64.9%	73.5%
2023	73.1%	74.4%
2024	57.9%	73.0%
2025	71.4%	76.4%

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	Aprilia RS125R	Honda CG125
0k-10k miles	71.0%	79.3%
10k-20k miles	55.0%	73.0%
20k-30k miles	54.6%	68.3%
30k-40k miles	57.5%	66.4%
40k-50k miles	40.5%	66.2%

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

Aprilia RS125R vs Honda CG125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Aprilia RS125R or the Honda CG125?

The Honda CG125 passes its MOT first time more often than the Aprilia RS125R: 72.2% vs 59.1%, a 13.1-point lead. Adjusted for age, mileage and test class, the Honda CG125 still comes out ahead: -11.3 points vs comparable bikes for the Aprilia RS125R, +0.7 for the Honda CG125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Aprilia RS125R fail its MOT on most?

Lights & signalling: 18.2% of Aprilia RS125R MOT tests failed on it, then steering & suspension (16.3%).

What does the Honda CG125 fail its MOT on most?

Lights & signalling: 10.0% of Honda CG125 MOT tests failed on it, then steering & suspension (7.2%).

Which holds up better at high mileage, the Aprilia RS125R or the Honda CG125?

At 40k-50k miles the Honda CG125 passes first time more often: 40.5% for the Aprilia RS125R vs 66.2% for the Honda CG125.

APRILIA RS125R 59.1% pass · 2,726 tests HONDA CG125 72.2% pass · 89.3k tests

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