PIAGGIO DIESIS 100

84cc Petrol Class 1

75.3%

first-time pass rate

19.2%

failed outright

8,320

median miles at test

182

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2008

The DIESIS 100's first-time pass rate has fallen 3.1 points since 2006, 74.5% to 71.4%.

What fails on a DIESIS 100

failure defects by component group · advisories excluded

Component group	Defects	% of defects
brakes	34	42
lighting and signalling	20	24.7
steering and suspension	11	13.6
tyres and wheels	6	7.4
body and structure	5	6.2
fuel and exhaust	4	4.9
Items Not Tested	1	1.2

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the DIESIS 100 beats 1 of its 2 closest rivals (HONDA Vision 110, PEUGEOT SPEEDFIGHT 100).

HONDA Vision 110 78.2% pass · 50.6k tests PEUGEOT SPEEDFIGHT 100 67.4% pass · 11.9k tests

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the DIESIS 100.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2002 (78.7% pass). Weakest: 2002 (78.7%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.