Derbi Senda Xtreme DRD SM 50 vs Piaggio Zip

The Piaggio Zip passes its MOT first time more often than the Derbi Senda Xtreme DRD SM 50: 71.3% vs 59.0%, a 12.3-point lead.

MOT reliability, side by side

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

Metric	Derbi Senda Xtreme DRD SM 50	Piaggio Zip
First-time pass rate	59.0%	71.3%
Outright fail rate	25.0%	20.4%
Vs comparable bikes (age & mileage adjusted)	-15.9 pts	-1.0 pts
Engine size	50cc	49cc
Median miles at test	5,718	8,882
MOT tests analysed	188	78,993
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.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Derbi Senda Xtreme DRD SM 50	Piaggio Zip
2023	48.8%	74.1%
2024	58.4%	73.4%
2025	68.4%	76.2%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

DERBI SENDA XTREME DRD SM 50 59.0% pass · 188 tests PIAGGIO ZIP 71.3% pass · 79.0k tests

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