Triumph Bonneville Speedmaster (2021)
2021 Triumph Bonneville Speedmaster
CarHunch analysed 265 real MOT records for the 2021 Triumph Bonneville Speedmaster. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2021 Triumph Bonneville Speedmaster is exceptionally reliable, with a 92.5% first-time pass rate that comfortably beats the UK average of 80%, and only 1.9% of vehicles have ever recorded a dangerous defect. This is a genuinely low-risk purchase from a mechanical standpoint.
At just 3,818 miles median mileage, these bikes are still relatively fresh, which partly explains the strong pass rate—but the 0.13 average failures per vehicle is genuinely impressive even accounting for low mileage, suggesting Triumph built this model well. If you're considering one, a pre-purchase inspection is still sensible practice, but focus your energy on checking service history and condition rather than bracing for hidden mechanical gremlins.
What to check before buying a 2021 Triumph Bonneville Speedmaster
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Triumph Bonneville Speedmaster
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (99%) | 262 | 92.4% | 0.13 |
| Other (1%) | 3 | 100% | 0 |
Mileage Distribution
Most 2021 Triumph Bonneville Speedmaster vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2021 Triumph Bonneville Speedmaster vehicles fall between 2,219 and 6,192 miles.
MOT History Averages
Found a specific Triumph Bonneville Speedmaster?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.