Vespa (douglas) GS160 vs Piaggio PX 125 (vespa)

The Vespa (douglas) GS160 passes its MOT first time more often than the Piaggio PX 125 (vespa): 90.3% vs 81.0%, a 9.3-point lead.

MOT reliability, side by side

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

Metric	Vespa (douglas) GS160	Piaggio PX 125 (vespa)
First-time pass rate	90.3%	81.0%
Outright fail rate	4.0%	11.3%
Engine size	160cc	124cc
Rank among all models	#854 of 5428	#3379 of 5428
Median miles at test	9,465	9,868
MOT tests analysed	372	33,171
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.

Pass rate by test year

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

Test year	Vespa (douglas) GS160	Piaggio PX 125 (vespa)
2011	87.1%	78.0%
2012	84.4%	78.2%
2013	89.2%	80.5%
2014	85.3%	79.8%
2015	90.3%	80.7%

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	Vespa (douglas) GS160	Piaggio PX 125 (vespa)
0k-10k miles	90.9%	83.0%
10k-20k miles	94.4%	79.5%
20k-30k miles	91.7%	77.3%
30k-40k miles	83.9%	78.8%
40k-50k miles	93.5%	82.0%

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

VESPA (DOUGLAS) GS160 90.3% pass · 372 tests PIAGGIO PX 125 (VESPA) 81.0% pass · 33.2k tests

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