APRILIA RS4 125

125cc Petrol Class 1

#4797 of 5426 overall #88 of 128 APRILIAs #412 of 734 commuter bikes

69.0%

first-time pass rate

22.4%

failed outright

9,084

median miles at test

1,266

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2014–2025

The RS4 125's first-time pass rate has held steady since 2014 (75.4% → 75.6%).

Pass rate by mileage

how the RS4 125's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage RS4 125 passes first time 73.2% of the time; by 20k that's 63.6%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a RS4 125

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	188	26.1	2.5×
lighting and signalling	104	14.4	1.3×
lamps and reflectors	102	14.2	3.2×
structure and attachments	93	12.9	7.6×
drive system	62	8.6	4.8×
steering and suspension	50	6.9	1.2×
suspension	49	6.8	4.3×
tyres and wheels	27	3.8	1.0×
steering	24	3.3	4.0×
tyres	21	2.9	2.3×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the RS4 125 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k tests

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the RS4 125.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2011 (71.1% pass). Weakest: 2014 (56.9%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

APRILIA RS4 125 FAQ

answers computed from the data above · terms in the glossary

Is the APRILIA RS4 125 reliable?

The APRILIA RS4 125 is less reliable than average for its class: 69.0% of its 1,266 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4797 of 5426 models.

What does a RS4 125 fail its MOT on most?

brakes — 26% of all defects recorded against failed RS4 125 tests.

What is the best year of RS4 125 to buy used?

By first-time pass rate, 2011-registered examples do best (71.1%) and 2014 worst (56.9%). Condition and history still trump the year.

How many miles will a RS4 125 last?

The median RS4 125 shows 9,084 miles at test, and examples around 20k miles still pass 63.6% of the time — mileage alone rarely kills one.