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Triumph Trident 900 vs Triumph Unknown: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Triumph Trident 900
85%
MOT pass rate · 82 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
More reliable
Verdict: On MOT pass rate, the Triumph Unknown is the more reliable of the two — 89% pass first time versus 85%. It's one signal among several; check the full breakdown below.

Head to head

Measure Triumph Trident 900 Triumph Unknown
MOT pass rate 85% 89% ✓
MOT failure rate 15% 11% ✓
Faults & advisories per test 0.7 0.6 ✓
Dangerous-fault share 1% ✓ 2%
Average mileage 38,062 mi 16,601 mi
Sample size (vehicles) 82 65,927

Most common faults

Triumph Trident 900

  1. Front Tyre worn close to the legal limit (4.1.3(ii))
  2. Rear Brake pad(s) close to minimum limit (3.2.A1f(i))
  3. Rear Tyre worn close to the legal limit (4.1.3(ii))
  4. Drive chain slightly loose (6.2.1d)
  5. Rear Brake disc(s) slightly worn (3.2.A1l)
  6. Rear Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)

Triumph Unknown

  1. Exhaust noisy (8.1.1 (a))
  2. Exhaust noisy (7.1.2)
  3. Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
  4. COVID-19 6 MONTH EXTENSION
  5. Rear Tyre worn close to the legal limit (5.2.3 (e))
  6. Steering headbearing has slight free play (2.2.2)

Reliability FAQ

On MOT pass rate, the Triumph Unknown is the more reliable of the two — 89% pass first time versus 85%. It's one signal among several; check the full breakdown below.

Full Triumph Trident 900 report Full Triumph Unknown report Most reliable cars

Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.