Triumph T100S Reliability, MOT Pass Rate & Common Faults
Free Triumph T100S car check
Is the Triumph T100S reliable? We analysed 563 real MOT tests across 100 vehicles to find out.
Got a specific Triumph T100S? Enter the reg for a free check:
The Triumph T100S is above average for reliability based on real UK MOT data. Common problems include headlamp at least one does not illuminate on dipped beam, stop lamp does not illuminate immediately a brake applies and headlamp at least one does not illuminate on main beam. Here's everything you need to know before buying a used Triumph T100S.
Triumph T100S Number Plates
Number plates registered to a Triumph T100S. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Triumph T100S MOT Pass Rate by Year
How likely is a Triumph T100S to pass its MOT? Here's the pass rate for each registration year, newest first.
Triumph T100S Problems — What Goes Wrong?
The most common reasons a Triumph T100S fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Triumph T100S Mileage — What's Normal?
How many miles does a typical Triumph T100S owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Triumph T100S MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Triumph T100S year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1970 | 168 | 94.6% | 4,177 | 13,987 | 21,273 |
| 1969 | 131 | 90.8% | 2,523 | 8,932 | 30,062 |
| 1968 | 124 | 91.9% | 3,239 | 8,948 | 26,395 |
How Long Does a Triumph T100S Last?
Based on 100 Triumph T100S vehicles on UK roads.
Triumph T100S Mileage Distribution
Total mileage recorded across all Triumph T100S 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 T100S
Based on MOT pass rates across all registration years with sufficient test data.
94.6% MOT pass rate from 168 tests
90.8% MOT pass rate from 131 tests
The best year to buy a used Triumph T100S is 1970, which has the highest MOT pass rate at 94.6% across 168 tests. The 1969 model year has the lowest pass rate at 90.8% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Triumph T100S Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Triumph T100S THIS CAR | 92.2% | 563 | 8,948 mi | 58 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 |
| Fiat Bravo 2.0 Hgt | 60.3% | 624 | 83,037 mi | 29 yrs |
Compared to the Triumph Bonneville (90.1% pass rate) and the Triumph Tiger (90.6% pass rate), the Triumph T100S outperforms both on MOT reliability.
Found a Triumph T100S 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 T100SShould you buy a used Triumph T100S?
The Triumph T100S has an overall MOT pass rate of 92.2% across 563 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 T100S are headlamp at least one does not illuminate on dipped beam (4 recorded failures), stop lamp does not illuminate immediately a brake applies (4), and headlamp at least one does not illuminate on main beam (3). 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.
A typical Triumph T100S owner drives around 159 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 T100S models stay on UK roads for around 58 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.