Triumph Bonneville T120 vs Harley-Davidson Flstf

The Triumph Bonneville T120 passes its MOT first time more often than the Harley-Davidson Flstf: 92.1% vs 89.0%, a 3.1-point lead.

MOT reliability, side by side

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

Metric	Triumph Bonneville T120	Harley-Davidson Flstf
First-time pass rate	92.1%	89.0%
Outright fail rate	3.0%	4.9%
Median miles at test	4,316	12,480
MOT tests analysed	724	30,148
Most common failure	lamps and reflectors	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.

TRIUMPH BONNEVILLE T120 92.1% pass · 724 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.