Derbi GP1 vs Piaggio NRG

The Derbi GP1 passes its MOT first time more often than the Piaggio NRG — 66.0% vs 65.5%, a 0.5-point lead.

MOT reliability, side by side

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

Metric	Derbi GP1	Piaggio NRG
First-time pass rate	66.0%	65.5%
Outright fail rate	25.6%	27.4%
Median miles at test	5,804	9,874
MOT tests analysed	754	40,458
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.

DERBI GP1 66.0% pass · 754 tests PIAGGIO NRG 65.5% pass · 40.5k tests

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