Triumph Bonneville T 100 (865) vs Harley-Davidson XL

The Triumph Bonneville T 100 (865) passes its MOT first time more often than the Harley-Davidson XL — 89.6% vs 87.9%, a 1.7-point lead.

MOT reliability, side by side

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

Metric	Triumph Bonneville T 100 (865)	Harley-Davidson XL
First-time pass rate	89.6%	87.9%
Outright fail rate	4.5%	5.3%
Median miles at test	7,832	6,108
MOT tests analysed	16,221	18,541
Most common failure	brakes	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 T 100 (865) 89.6% pass · 16.2k 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.