Head-to-head · 2005–2025
Data as of: DVSA MOT results to 2025
Harley-Davidson XLH vs Triumph Bonneville
The Triumph Bonneville passes its MOT first time more often than the Harley-Davidson XLH: 89.0% vs 83.6%, a 5.4-point lead.
MOT reliability, side by side
first-time pass rate, outright fail rate and tests analysed · 2005–2025
| Metric | Harley-Davidson XLH | Triumph Bonneville |
|---|---|---|
| First-time pass rate | 83.6% | 89.0% |
| Outright fail rate | 8.9% | 5.0% |
| Median miles at test | 11,254 | 7,619 |
| MOT tests analysed | 1,176 | 195,256 |
| Most common failure | lighting and signalling | brakes |
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.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.