Triumph Bonnville MOT Pass Rate
Overall pass rate across all manufacture years, based on 76 real MOT test results. Failure rate: 6.6%.
Data from official DVSA MOT testing records
Triumph Bonnville MOT Reliability Overview
The Triumph Bonnville is a rare vehicle in the UK, with 76 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 93.4% and a failure rate of 6.6%, which is well above the UK average of approximately 37%.
Based on this data, the Triumph Bonnville earns a "Excellent" reliability rating. The average Triumph Bonnville presents for MOT with approximately 22,313 miles on the clock.
The most common MOT failure for the Triumph Bonnville is Motorcycle lighting and signalling, affecting 6.6% of all tests. Motorcycle lighting and signalling issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. The second most common issue is Motorcycle steering and suspension at 3.9%. Motorcycle reg plates and vin rounds out the top three at 2.6%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Motorcycle Lighting And Signalling | 6.6% | 5 |
| 2 | Motorcycle Steering And Suspension | 3.9% | 3 |
| 3 | Motorcycle Reg Plates And Vin | 2.6% | 2 |
| 4 | Motorcycle Body And Structure | 1.3% | 1 |
| 5 | Motorcycle Drive System | 1.3% | 1 |
Failures per 10,000 Miles
avg. 22,313 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Motorcycle lighting and signalling | 2.95 | 6.6% | 5 |
| Motorcycle steering and suspension | 1.77 | 3.9% | 3 |
| Motorcycle reg plates and vin | 1.18 | 2.6% | 2 |
| Motorcycle body and structure | 0.59 | 1.3% | 1 |
| Motorcycle drive system | 0.59 | 1.3% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Triumph Bonnville has 22,313 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The Triumph Bonnville has a mileage-adjusted failure rate of 2.96% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Triumph Bonnville MOT Data
The Triumph Bonnville is a rare vehicle in the UK, with 76 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 93.4% and a failure rate of 6.6%, which is well above the UK average of approximately 37%.
For Triumph Bonnville owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on motorcycle lighting and signalling and motorcycle steering and suspension for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific Bonnville is likely to perform.
Motorcycle lighting and signalling — 6.6% of failures
Motorcycle lighting and signalling issues account for 6.6% of MOT failures on the Triumph Bonnville. Motorcycle lighting and signalling issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Motorcycle steering and suspension — 3.9% of failures
Motorcycle steering and suspension issues account for 3.9% of MOT failures on the Triumph Bonnville. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Motorcycle reg plates and vin — 2.6% of failures
Motorcycle reg plates and vin issues account for 2.6% of MOT failures on the Triumph Bonnville. Motorcycle reg plates and vin issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Frequently Asked Questions
What is the MOT pass rate for the Triumph Bonnville?
Based on 76 (based on limited data) MOT tests in our database, the Triumph Bonnville has an overall pass rate of 93.4% (6.6% fail rate).
What are the most common MOT failures on a Triumph Bonnville?
The top 3 reasons a Triumph Bonnville fails its MOT are: 1. Motorcycle lighting and signalling (6.6%), 2. Motorcycle steering and suspension (3.9%), 3. Motorcycle reg plates and vin (2.6%). Check these areas before booking your MOT.
Is the Triumph Bonnville reliable?
With a 6.6% MOT failure rate, the Bonnville is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Triumph Bonnville?
Based on failure data, focus on: Motorcycle lighting and signalling (6.6%); Motorcycle steering and suspension (3.9%); Motorcycle reg plates and vin (2.6%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.