Triumph Bonneville Scrambler vs Triumph Thunderbird

The Triumph Thunderbird passes its MOT first time more often than the Triumph Bonneville Scrambler — 87.8% vs 84.5%, a 3.3-point lead.

MOT reliability, side by side

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

Metric	Triumph Bonneville Scrambler	Triumph Thunderbird
First-time pass rate	84.5%	87.8%
Outright fail rate	6.4%	6.2%
Median miles at test	7,530	13,106
MOT tests analysed	1,693	56,312
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 BONNEVILLE SCRAMBLER 84.5% pass · 1,693 tests TRIUMPH THUNDERBIRD 87.8% pass · 56.3k tests

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