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Triumph T20 trials vs Triumph Unknown: reliability comparison

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

Triumph T20 trials
80%
MOT pass rate · 3 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph T20 trials (80%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Triumph T20 trials Triumph Unknown
MOT pass rate 80% 89% ✓
MOT failure rate 20% 11% ✓
Faults & advisories per test 1.0 0.6 ✓
Dangerous-fault share 0% ✓ 2%
Average mileage 27,539 mi 16,601 mi
Sample size (vehicles) 3 65,927

Most common faults

Triumph T20 trials

  1. Rear wheel bearings have slight free play (2.4.A.2c)
  2. Front suspension has inadequate damping effect. (2.3.6c)
  3. Headlamp at least one does not illuminate on main beam (1.2.2a(ii))
  4. Steering headbearing has excessive free play (2.2.2)
  5. Throttle has a significant change in engine speed whilst moving the steering from lock to lock (2.1.4)
  6. Wheel alignment incorrect which adversely affects the handling (2.5.1)

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 T20 trials (80%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph T20 trials 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.