1978 Triumph Bonneville — MOT History by Age
How cars manufactured in 1978 perform at MOT as they age
Data from official DVSA MOT testing records
Insufficient data for same-age comparison.
How This Car Ages
Pass rate progression for the 1978 Triumph Bonneville as it ages.
Bar chart showing pass rate by car age from 31 to 41 years
📊 View as table
| Age | Pass Rate | Tests |
|---|---|---|
| 31 yrs | 83.8% | 173 |
| 32 yrs | 81.2% | 154 |
| 33 yrs | 78.1% | 151 |
| 34 yrs | 85.4% | 158 |
| 35 yrs | 85.3% | 150 |
| 36 yrs | 87.7% | 146 |
| 37 yrs | 87.1% | 163 |
| 38 yrs | 86.8% | 152 |
| 39 yrs | 87.7% | 163 |
| 40 yrs | 97.0% | 100 |
| 41 yrs | 93.3% | 30 |
Pass Rate Trend
How the 1978 Triumph Bonneville pass rate changes as it ages, from first MOT to most recent.
Trend shows improving over 11 years
📊 View as table
| Built | Pass Rate | Tests |
|---|---|---|
| 2019 (41 yrs) | 93.3% | 30 |
| 2018 (40 yrs) | 97% | 100 |
| 2017 (39 yrs) | 87.7% | 163 |
| 2016 (38 yrs) | 86.8% | 152 |
| 2015 (37 yrs) | 87.1% | 163 |
| 2014 (36 yrs) | 87.7% | 146 |
| 2013 (35 yrs) | 85.3% | 150 |
| 2012 (34 yrs) | 85.4% | 158 |
| 2011 (33 yrs) | 78.1% | 151 |
| 2010 (32 yrs) | 81.2% | 154 |
| 2009 (31 yrs) | 83.8% | 173 |
Year-by-Year MOT Results
Common MOT Failures
Top failure categories across all test years for 1978 Triumph Bonneville, with age trends.
How Failures Change With Age
Comparing failure rates between the youngest and oldest test years.
Not enough data to compare failures across ages.
Other Manufacture Years
Looking for the best year to buy? See the full comparison on the Triumph Bonneville page →
About This Data
This page shows how Triumph Bonneville cars manufactured in 1978 perform at MOT as they age. Data spans from 2009 to 2019, covering 1,540 tests. Pass rates naturally decline with age as components wear.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.