Triumph Thunderbird Sport vs Triumph Bonneville

The Triumph Bonneville passes its MOT first time more often than the Triumph Thunderbird Sport: 89.0% vs 85.7%, a 3.3-point lead.

MOT reliability, side by side

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

Metric	Triumph Thunderbird Sport	Triumph Bonneville
First-time pass rate	85.7%	89.0%
Outright fail rate	6.9%	5.0%
Median miles at test	14,622	7,619
MOT tests analysed	607	195,256
Most common failure	brakes	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.

TRIUMPH THUNDERBIRD SPORT 85.7% pass · 607 tests TRIUMPH BONNEVILLE 89.0% pass · 195k tests

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