PIAGGIO DIESIS

84cc Petrol Class 1

#4406 of 5426 overall #110 of 136 PIAGGIOs #288 of 412 scooter bikes

73.9%

first-time pass rate

19.7%

failed outright

9,788

median miles at test

920

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2005–2012

The DIESIS's first-time pass rate has fallen 12.2 points since 2005, 84.4% to 72.2%.

Pass rate by mileage

how the DIESIS's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage DIESIS passes first time 80.0% of the time; by 20k that's 67.3%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a DIESIS

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	140	29.2	2.3×
brakes	135	28.1	2.3×
steering and suspension	91	19	2.4×
tyres and wheels	37	7.7	2.0×
fuel and exhaust	28	5.8	3.9×
body and structure	22	4.6	3.6×
reg plates and vin	8	1.7	1.3×
lamps and reflectors	8	1.7	0.3×
structure and attachments	6	1.2	0.5×
steering	5	1	1.0×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the DIESIS 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.

Pass rate by registration year

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

Best year to buy used: 2002 (75.2% pass). Weakest: 2003 (68.5%).

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.

PIAGGIO DIESIS FAQ

answers computed from the data above · terms in the glossary

Is the PIAGGIO DIESIS reliable?

The PIAGGIO DIESIS is about average for its class: 73.9% of its 920 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4406 of 5426 models.

What does a DIESIS fail its MOT on most?

lighting and signalling — 29% of all defects recorded against failed DIESIS tests.

How many miles will a DIESIS last?

The median DIESIS shows 9,788 miles at test, and examples around 20k miles still pass 67.3% of the time — mileage alone rarely kills one.