Derbi Senda SM vs Peugeot Speedfight

The Peugeot Speedfight passes its MOT first time more often than the Derbi Senda SM: 65.2% vs 51.1%, a 14.1-point lead.

MOT reliability, side by side

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

Metric	Derbi Senda SM	Peugeot Speedfight
First-time pass rate	51.1%	65.2%
Outright fail rate	35.5%	26.3%
Vs comparable bikes (age & mileage adjusted)	-21.0 pts	-5.3 pts
Engine size	49cc	49cc
Rank among all models	#5388 of 5428	#5008 of 5428
Median miles at test	10,212	13,547
MOT tests analysed	1,013	83,728
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	Derbi Senda SM	Peugeot Speedfight
Lights & signalling	27.8%	15.4%
Steering & suspension	16.9%	12.9%
Brakes	15.7%	10.8%
Tyres & wheels	4.0%	4.7%
Drive system	8.7%	0.0%
Structure & body	4.5%	2.3%
Fuel & exhaust	2.9%	2.5%

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	Derbi Senda SM	Peugeot Speedfight
2010	40.5%	62.0%
2011	46.2%	60.9%
2012	54.2%	61.2%
2013	51.6%	61.2%
2014	44.4%	61.7%
2015	57.8%	64.4%
2016	45.6%	63.0%
2017	61.2%	68.5%

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	Derbi Senda SM	Peugeot Speedfight
0k-10k miles	53.6%	73.1%
10k-20k miles	49.5%	63.3%
20k-30k miles	44.4%	58.2%

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

Derbi Senda SM vs Peugeot Speedfight FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Derbi Senda SM or the Peugeot Speedfight?

The Peugeot Speedfight passes its MOT first time more often than the Derbi Senda SM: 65.2% vs 51.1%, a 14.1-point lead. Adjusted for age, mileage and test class, the Peugeot Speedfight still comes out ahead: -21.0 points vs comparable bikes for the Derbi Senda SM, -5.3 for the Peugeot Speedfight. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Derbi Senda SM fail its MOT on most?

Lights & signalling: 27.8% of Derbi Senda SM MOT tests failed on it, then steering & suspension (16.9%).

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%).

Which holds up better at high mileage, the Derbi Senda SM or the Peugeot Speedfight?

At 20k-30k miles the Peugeot Speedfight passes first time more often: 44.4% for the Derbi Senda SM vs 58.2% for the Peugeot Speedfight.

DERBI SENDA SM 51.1% pass · 1,013 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.