Triumph Bonneville 750 vs Harley-Davidson XL

The Harley-Davidson XL passes its MOT first time more often than the Triumph Bonneville 750: 87.9% vs 85.2%, a 2.7-point lead.

MOT reliability, side by side

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

Metric	Triumph Bonneville 750	Harley-Davidson XL
First-time pass rate	85.2%	87.9%
Outright fail rate	6.5%	5.3%
Median miles at test	17,194	6,108
MOT tests analysed	630	18,541
Most common failure	lighting and signalling	lamps and reflectors

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 750 85.2% pass · 630 tests HARLEY-DAVIDSON XL 87.9% pass · 18.5k tests

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