Ajs JSM vs Peugeot Speedfight

The Peugeot Speedfight passes its MOT first time more often than the Ajs JSM: 65.2% vs 56.4%, a 8.8-point lead.

MOT reliability, side by side

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

Metric	Ajs JSM	Peugeot Speedfight
First-time pass rate	56.4%	65.2%
Outright fail rate	32.1%	26.3%
Vs comparable bikes (age & mileage adjusted)	-18.7 pts	-5.3 pts
Engine size	49cc	49cc
Rank among all models	#5314 of 5428	#5008 of 5428
Median miles at test	5,541	13,547
MOT tests analysed	599	83,728
Most common failure	lamps and reflectors	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	Ajs JSM	Peugeot Speedfight
Lights & signalling	19.9%	15.4%
Steering & suspension	18.5%	12.9%
Brakes	11.9%	10.8%
Structure & body	12.4%	2.3%
Tyres & wheels	3.2%	4.7%
Fuel & exhaust	0.3%	2.5%
Drive system	1.2%	0.0%

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	Ajs JSM	Peugeot Speedfight
2018	62.8%	69.6%
2019	50.8%	68.9%
2020	64.4%	72.0%
2021	57.0%	71.0%
2022	55.8%	71.7%
2023	58.7%	71.0%
2024	45.3%	72.9%
2025	51.2%	74.0%

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	Ajs JSM	Peugeot Speedfight
0k-10k miles	57.4%	73.1%
10k-20k miles	47.2%	63.3%

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

Ajs JSM vs Peugeot Speedfight FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Ajs JSM or the Peugeot Speedfight?

The Peugeot Speedfight passes its MOT first time more often than the Ajs JSM: 65.2% vs 56.4%, a 8.8-point lead. Adjusted for age, mileage and test class, the Peugeot Speedfight still comes out ahead: -18.7 points vs comparable bikes for the Ajs JSM, -5.3 for the Peugeot Speedfight. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Ajs JSM fail its MOT on most?

Lights & signalling: 19.9% of Ajs JSM MOT tests failed on it, then steering & suspension (18.5%).

What does the Peugeot Speedfight fail its MOT on most?

Lights & signalling: 15.4% of Peugeot Speedfight MOT tests failed on it, then steering & suspension (12.9%).

AJS JSM 56.4% pass · 599 tests PEUGEOT SPEEDFIGHT 65.2% pass · 83.7k tests

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