DVSA Statistics
1977 Triumph Bonniville
MOT Pass Rate & Pre-MOT Checklist
There isn't much MOT data yet for the 1977 Triumph Bonniville (only 2 tests in our DVSA dataset), so these figures are a rough guide. We still highlight common failure items below so you can check before your MOT.
Pass Rate
Based on 2 DVSA anonymised MOT tests · About this data
Pass Rate
50%
Lower than average
Limited data available for this model; results may be less representative.
Top Failure Reasons
Common MOT failures for this model
Based on DVSA statistics from 2 recorded tests.
Pre-MOT Checklist for 1977 Triumph Bonniville
Based on common failure points for this model, check these items before your MOT:
- 1
Check for excessive play in steering wheel - should be minimal free movement
Steering – Common fail on this model
- 2
Check exhaust for leaks, holes, or excessive corrosion - listen for blowing
Exhaust – Common fail on this model
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Frequently Asked Questions
Is a 1977 Triumph Bonniville likely to fail its MOT?
Based on DVSA statistics, the 1977 Triumph Bonniville has a 50% MOT pass rate. This is below average, so extra pre-MOT checks are recommended.
What are the most common MOT failures on a 1977 Triumph Bonniville?
The most common MOT failure reasons for a 1977 Triumph Bonniville are: steering head bearings have excessive wear or play, exhaust system leaking or insecure, a wheel bearing with excessive play. Many of these can be checked and fixed before your test to improve your chances of passing.
How can I reduce the chance my 1977 Triumph Bonniville fails its MOT?
To improve your chances of passing, check the items that commonly fail on this model: steering head bearings have excessive wear or play, exhaust system leaking or insecure, a wheel bearing with excessive play. Use our pre-MOT checklist above to identify potential issues before your test. Many common failures are easy DIY fixes.
How many 1977 Triumph Bonnivilles fail their MOT?
Around 50% of 1977 Triumph Bonnivilles fail their MOT test, meaning roughly 1 in 2 don't pass first time. The most common reasons are steering head bearings have excessive wear or play and exhaust system leaking or insecure. Pre-checking these items can significantly improve your chances.
What should I check before my 1977 Triumph Bonniville MOT?
Before your 1977 Triumph Bonniville MOT, check these commonly-failed items: steering head bearings have excessive wear or play, exhaust system leaking or insecure, a wheel bearing with excessive play. Most are visual checks you can do at home – look for worn tyres, test all lights work, and check for obvious damage or leaks.
Is the 1977 Triumph Bonniville reliable for MOT?
With a 50% MOT pass rate, the 1977 Triumph Bonniville performs below average compared to typical vehicles. Extra attention to pre-MOT checks is recommended for this model.