Triumph Thunderbird Reliability, MOT Pass Rate & Common Faults
Free Triumph Thunderbird car check
Is the Triumph Thunderbird reliable? We analysed 66,789 real MOT tests across 6,108 vehicles to find out.
Got a specific Triumph Thunderbird? Enter the reg for a free check:
The Triumph Thunderbird is above average for reliability based on real UK MOT data. Common problems include tyre tread depth is below minimum requirements of 1.0mm, shock absorber seal failed and leaking oil and stop lamp does not illuminate immediately a brake applies. Here's everything you need to know before buying a used Triumph Thunderbird.
Triumph Thunderbird Number Plates
Number plates registered to a Triumph Thunderbird. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Triumph Thunderbird MOT Pass Rate by Year
How likely is a Triumph Thunderbird to pass its MOT? Here's the pass rate for each registration year, newest first.
Triumph Thunderbird Problems — What Goes Wrong?
The most common reasons a Triumph Thunderbird fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Triumph Thunderbird Common Faults & Problems
These are the most common serious faults found on Triumph Thunderbird models during MOT testing — flagged as dangerous or major failures that need immediate attention.
Triumph Thunderbird Mileage — What's Normal?
How many miles does a typical Triumph Thunderbird owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Triumph Thunderbird MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Triumph Thunderbird year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2018 | 96 | 91.7% | 4,778 | 7,238 | 10,855 |
| 2017 | 1,099 | 91.3% | 4,674 | 7,719 | 11,825 |
| 2016 | 1,314 | 88.7% | 5,058 | 8,101 | 13,053 |
| 2015 | 2,381 | 90.7% | 5,208 | 9,234 | 13,865 |
| 2014 | 3,626 | 90.2% | 5,801 | 9,921 | 15,940 |
| 2013 | 2,145 | 91.2% | 5,893 | 9,822 | 16,244 |
| 2012 | 1,172 | 90.2% | 5,916 | 10,712 | 16,860 |
| 2011 | 1,222 | 89.7% | 6,661 | 11,816 | 18,968 |
| 2010 | 2,128 | 88.9% | 6,977 | 12,254 | 19,944 |
| 2009 | 1,259 | 90.2% | 7,756 | 12,446 | 19,197 |
| 2004 | 2,577 | 89.7% | 5,933 | 11,482 | 19,018 |
| 2003 | 3,885 | 90.5% | 6,738 | 12,173 | 19,334 |
| 2002 | 4,426 | 90.5% | 6,567 | 11,516 | 18,522 |
| 2001 | 3,811 | 90.8% | 7,530 | 12,763 | 20,554 |
| 2000 | 4,569 | 89.3% | 8,842 | 14,978 | 22,946 |
| 1999 | 4,793 | 88.6% | 8,562 | 14,415 | 23,538 |
| 1998 | 5,935 | 88.3% | 9,182 | 15,472 | 23,156 |
| 1997 | 3,796 | 86.7% | 8,918 | 15,292 | 23,137 |
| 1996 | 5,544 | 86.7% | 10,987 | 17,177 | 26,593 |
| 1995 | 7,005 | 86.1% | 10,625 | 18,110 | 26,540 |
How Long Does a Triumph Thunderbird Last?
Based on 6,108 Triumph Thunderbird vehicles on UK roads.
Triumph Thunderbird Mileage Distribution
Total mileage recorded across all Triumph Thunderbird MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Triumph Thunderbird
Based on MOT pass rates across all registration years with sufficient test data.
97.0% MOT pass rate from 99 tests
85.6% MOT pass rate from 111 tests
The best year to buy a used Triumph Thunderbird is 1963, which has the highest MOT pass rate at 97.0% across 99 tests. The 1952 model year has the lowest pass rate at 85.6% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Triumph Thunderbird Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Triumph Thunderbird THIS CAR | 89.1% | 66,789 | 13,384 mi | 31 yrs |
| Triumph Bonneville | 90.1% | 235,206 | 7,823 mi | 53 yrs |
| Triumph Tiger | 90.6% | 196,853 | 17,026 mi | 32 yrs |
| Triumph Sprint | 87.3% | 158,613 | 21,242 mi | 33 yrs |
| Rover Maestro | 66.7% | 31,503 | 79,608 mi | 38 yrs |
Compared to the Triumph Bonneville (90.1% pass rate) and the Triumph Tiger (90.6% pass rate), the Triumph Thunderbird trails behind on MOT reliability.
Found a Triumph Thunderbird you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Triumph ThunderbirdShould you buy a used Triumph Thunderbird?
The Triumph Thunderbird has an overall MOT pass rate of 89.1% across 66,789 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Triumph Thunderbird are tyre tread depth is below minimum requirements of 1.0mm (473 recorded failures), shock absorber seal failed and leaking oil (371), and stop lamp does not illuminate immediately a brake applies (285). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
On the safety side, the most frequently flagged dangerous fault is tyre tread depth is below minimum requirements of 1.0mm. Dangerous faults cause an immediate MOT failure and mean the vehicle is not roadworthy until repaired. If you're viewing a Triumph Thunderbird with an expired or recently passed MOT, ask the seller whether any dangerous faults were found and fixed during the last test.
A typical Triumph Thunderbird owner drives around 540 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Triumph Thunderbird models stay on UK roads for around 31 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.