Generic Sirion vs Piaggio Zip

The Generic Sirion passes its MOT first time more often than the Piaggio Zip — 72.3% vs 71.3%, a 1.0-point lead.

MOT reliability, side by side

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

Metric	Generic Sirion	Piaggio Zip
First-time pass rate	72.3%	71.3%
Outright fail rate	21.7%	20.4%
Median miles at test	5,574	8,882
MOT tests analysed	184	78,993
Most common failure	brakes	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.

GENERIC SIRION 72.3% pass · 184 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.