Bultaco Astro vs Piaggio NRG

The Piaggio NRG passes its MOT first time more often than the Bultaco Astro: 65.5% vs 52.3%, a 13.2-point lead.

MOT reliability, side by side

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

Metric	Bultaco Astro	Piaggio NRG
First-time pass rate	52.3%	65.5%
Outright fail rate	42.1%	27.4%
Vs comparable bikes (age & mileage adjusted)	-18.6 pts	-6.0 pts
Engine size	49cc	49cc
Median miles at test	12,515	9,874
MOT tests analysed	107	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.

"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 mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Bultaco Astro	Piaggio NRG
0k-10k miles	50.0%	71.3%
10k-20k miles	50.0%	60.6%

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

BULTACO ASTRO 52.3% pass · 107 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.