Triumph Bonny MOT Pass Rate
Overall pass rate across all manufacture years, based on 69 real MOT test results. Failure rate: 10.1%.
Data from official DVSA MOT testing records
Triumph Bonny MOT Reliability Overview
The Triumph Bonny is a rare vehicle in the UK, with 69 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 89.9% and a failure rate of 10.1%, which is well above the UK average of approximately 37%.
Based on this data, the Triumph Bonny earns a "Excellent" reliability rating. The average Triumph Bonny presents for MOT with approximately 21,143 miles on the clock.
The most common MOT failure for the Triumph Bonny is Motorcycle lighting and signalling, affecting 8.7% 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 2.9%. Motorcycle structure and attachments rounds out the top three at 2.9%. 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 | 10.1% | 7 |
| 2 | Motorcycle Steering And Suspension | 4.3% | 3 |
| 3 | Motorcycle Brakes | 2.9% | 2 |
| 4 | Motorcycle Lamps And Reflectors | 2.9% | 2 |
| 5 | Motorcycle Structure And Attachments | 2.9% | 2 |
| 6 | Motorcycle Tyres | 2.9% | 2 |
| 7 | Motorcycle Body And Structure | 1.4% | 1 |
Failures per 10,000 Miles
avg. 21,143 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 | 4.80 | 10.1% | 7 |
| Motorcycle steering and suspension | 2.06 | 4.3% | 3 |
| Motorcycle brakes | 1.37 | 2.9% | 2 |
| Motorcycle lamps and reflectors | 1.37 | 2.9% | 2 |
| Motorcycle structure and attachments | 1.37 | 2.9% | 2 |
| Motorcycle tyres | 1.37 | 2.9% | 2 |
| Motorcycle body and structure | 0.69 | 1.4% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Triumph Bonny has 21,143 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 Bonny has a mileage-adjusted failure rate of 4.78% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Triumph Bonny MOT Data
The Triumph Bonny is a rare vehicle in the UK, with 69 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 89.9% and a failure rate of 10.1%, which is well above the UK average of approximately 37%.
For Triumph Bonny 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 Bonny is likely to perform.
Motorcycle lighting and signalling — 8.7% of failures
Motorcycle lighting and signalling issues account for 8.7% of MOT failures on the Triumph Bonny. 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 — 2.9% of failures
Motorcycle steering and suspension issues account for 2.9% of MOT failures on the Triumph Bonny. 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 structure and attachments — 2.9% of failures
Motorcycle structure and attachments issues account for 2.9% of MOT failures on the Triumph Bonny. Motorcycle structure and attachments 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 Bonny?
Based on 69 (based on limited data) MOT tests in our database, the Triumph Bonny has an overall pass rate of 89.9% (10.1% fail rate).
What are the most common MOT failures on a Triumph Bonny?
The top 3 reasons a Triumph Bonny fails its MOT are: 1. Motorcycle lighting and signalling (8.7%), 2. Motorcycle steering and suspension (2.9%), 3. Motorcycle structure and attachments (2.9%). Check these areas before booking your MOT.
Is the Triumph Bonny reliable?
With a 10.1% MOT failure rate, the Bonny is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Triumph Bonny?
Based on failure data, focus on: Motorcycle lighting and signalling (8.7%); Motorcycle steering and suspension (2.9%); Motorcycle structure and attachments (2.9%). 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.