Used buying checklist
Triumph Bonneville T 100 865 reliability, common problems and used buying checks
A used Triumph Bonneville T 100 865 looks better than average for reliability in UK MOT data: 5.2% of 1,089 tests failed, compared with 18.7% across all indexed models. A good example should have a clean MOT history for brakes, corrosion and structure, and lights and electrical.
It can be, if the exact car has a clean history for brakes, corrosion and structure, and lights and electrical.
Start with brakes, corrosion and structure, and lights and electrical, then compare the car's mileage and recall record below.
Sources used: DVSA MOT tests (Apr 2026); vehicle recalls (Apr 2026); MOT fault wording (May 2025). MOT data does not capture every reliability issue, especially intermittent engine, gearbox or infotainment faults that do not appear during the test.
- 5.2% MOT failure rate
- Median tested mileage 11,244 miles
- 57 failed MOT tests analysed
Brakes is the clearest area to check
Brakes is the clearest named problem area in this model's MOT history (4.5 MOT notes per 100 tests). Example MOT phrases from this area include indicates excessive fluctuation of brake effort, does not illuminate by the operation of both brake controls, and remains on when the brakes are released.
Example MOT phrases to search in the car's history:
- indicates excessive fluctuation of brake effort
- does not illuminate by the operation of both brake controls
- remains on when the brakes are released
- excessively corroded
- spoke excessively corroded
- corroded so that its cross sectional area is reduced and seriously weakened
- lens defective which has no effect on emitted light
- missing in the case of multiple lamps or light sources
- incorrect which adversely affects the steering
- spindle or securing nut(s) so insecure that wheel security or steering control is adversely affected
Focus on brakes, corrosion and structure, and lights and electrical
The model's recorded failure rate is 5.2%, -13.5 percentage points compared with the average across all models. Use the seller questions below to check whether repeat MOT notes have actually been repaired.
- MOT tests analysed1,089 tests
- Median tested mileage11,244 miles
- Failed MOT tests57
Should you buy a used Triumph Bonneville T 100 865?
94.8% of the MOT tests we analysed for this model passed. The model's recorded failure rate is 5.2%, -13.5 percentage points compared with the average across all models. This is a buying brief for the exact car in front of you: clean repeat history matters more than badge reputation.
- Repeat unresolved MOT notes for brakes, corrosion and structure, and lights and electrical
- brakes appearing across more than one MOT
- Any dangerous MOT failure on the exact car, especially if the same area appears again later
- A seller who cannot explain MOT wording such as "indicates excessive fluctuation of brake effort"
It can be, if the exact car has a clean history for brakes, corrosion and structure, and lights and electrical.
Start with brakes, corrosion and structure, and lights and electrical, then compare the car's mileage and recall record below.
Brakes is the clearest named problem area in the MOT history (4.5 MOT notes per 100 tests). These counts are issue notes, not failure rates, because a single MOT can list several faults.
Use the mileage table to judge whether the car is being viewed at a lower- or higher-risk mileage.
The MOT failure rate rises from 6.5% at 6-10 years to 5.5% at 15+ years. Compare the car with the nearest age range before treating a fault as normal wear or a warning sign. The average MOT failure rate across all models in the same dataset is 18.7%.
Start with brakes, corrosion and structure, lights and electrical, and suspension and steering. The checklist on this page explains why each area is being recommended, what to inspect, and what to ask the seller.
No relevant recall notices are listed in this report, but recall completion is tied to the exact vehicle, so the seller should still be able to prove recall status.
What should I check first?
Start with brakes, corrosion and structure, lights and electrical, and suspension and steering. The checklist on this page explains why each area is being recommended, what to inspect, and what to ask the seller. Each item shows whether it comes from MOT results, recall notices, or a standard used-car check.
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Brakes Seen in MOT results
Brakes is one of the most common MOT problem areas for this model (4.5 MOT notes per 100 tests).
What to check: Check brake pipe condition, braking balance, handbrake hold, and recent brake work.
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Corrosion and structure Seen in MOT results
Corrosion and structure is one of the most common MOT problem areas for this model (0.9 MOT notes per 100 tests).
What to check: Inspect sills, subframes, mounting points, arches, and underside corrosion advisories.
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Lights and electrical Seen in MOT results
Lights and electrical is one of the most common MOT problem areas for this model (0.3 MOT notes per 100 tests).
What to check: Check every lamp, warning light, horn, battery condition, and dashboard messages.
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Suspension and steering Seen in MOT results
Suspension and steering is one of the most common MOT problem areas for this model (0.2 MOT notes per 100 tests).
What to check: Listen for knocks, check uneven tyre wear, and inspect steering play.
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Emissions, engine, and exhaust Seen in MOT results
Emissions, engine, and exhaust is one of the most common MOT problem areas for this model (0.1 MOT notes per 100 tests).
What to check: Check warning lights, smoke, exhaust leaks, recent emissions failures, and service history.
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Tyres and wheels Seen in MOT results
Tyres and wheels is one of the most common MOT problem areas for this model (0.1 MOT notes per 100 tests).
What to check: Check tyre age, tread depth, sidewall damage, wheel condition, and alignment wear.
What changes with mileage?
These are the car areas that show up in MOT records at different mileages.
Common MOT problem areas
Common faults: what usually fails on this model?
Brakes is the clearest named problem area in the MOT history (4.5 MOT notes per 100 tests). These counts are issue notes, not failure rates, because a single MOT can list several faults.
Mileage and age checks
Mileage changes: what starts showing up after high mileage?
MOT failure rates rise from 5.3% at 0-50k miles to 0.0% at 50-100k miles. Use the mileage table to judge whether the car is being viewed at a lower- or higher-risk mileage.
| Mileage range | Tests | Vehicles | Failure rate (vs all models) | Median mileage |
|---|---|---|---|---|
| 0-50k | 1,071 | 995 | 5.3%-5.5 percentage points vs all models | 11,146 miles |
| 50-100k | 15 | 15 | 0.0%-20.7 percentage points vs all models | 62,803 miles |
Problem areas by mileage
This table shows which car areas and exact MOT phrases appear at each mileage range.
| Mileage range | Car areas most often recorded | Specific MOT defect examples |
|---|---|---|
| 0-50k |
|
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| 50-100k |
|
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Fair comparisons: is this problem normal for its age?
The MOT failure rate rises from 6.5% at 6-10 years to 5.5% at 15+ years. Compare the car with the nearest age range before treating a fault as normal wear or a warning sign. The average MOT failure rate across all models in the same dataset is 18.7%. The highest failure rate by age is 6.5% for 6-10 years cars, based on 31 tests.
| Age range | Tests | Vehicles | Failure rate (vs all models) | Median age |
|---|---|---|---|---|
| 6-10 years 2016–2020 reg. |
31 | 30 | 6.5%-10.2 percentage points vs all models | 9.9 years |
| 10-15 years 2011–2016 reg. |
619 | 574 | 5.0%-18.5 percentage points vs all models | 12.4 years |
| 15+ years pre-2011 reg. |
439 | 415 | 5.5%-20.4 percentage points vs all models | 17.0 years |
Recall records and data freshness
Recall context: are there safety notices to know about?
No relevant recall notices are listed in this report, but recall completion is tied to the exact vehicle, so the seller should still be able to prove recall status.
| No relevant recall notices are listed here. Recall completion is still vehicle-specific, so check the exact car with the manufacturer or DVSA. |
Related searches
Common ways people look up the Triumph Bonneville T 100 865. Each link runs the search and lands on the relevant section of this report.
Related reliability guides
See where this model sits against other Triumph reports by MOT failure rate and common problem area.
Compare high-confidence model reports across all makes.
Use the fleet mileage baseline before checking this model's own mileage table.
Compare this model's age pattern with the wider MOT baseline.
Sources used: DVSA MOT tests (Apr 2026); vehicle recalls (Apr 2026); MOT fault wording (May 2025). These are patterns from many MOT tests and recall notices. They help you decide what to inspect and what to ask; they do not certify the condition of one specific car.