Ducati X Diavel vs Harley-Davidson Flstf

The Ducati X Diavel passes its MOT first time more often than the Harley-Davidson Flstf — 89.4% vs 89.0%, a 0.4-point lead.

MOT reliability, side by side

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

Metric	Ducati X Diavel	Harley-Davidson Flstf
First-time pass rate	89.4%	89.0%
Outright fail rate	7.7%	4.9%
Median miles at test	5,832	12,480
MOT tests analysed	3,445	30,148
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.

DUCATI X DIAVEL 89.4% pass · 3,445 tests HARLEY-DAVIDSON FLSTF 89.0% pass · 30.1k tests

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