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Triumph T 20 vs Triumph Unknown: reliability comparison

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

Triumph T 20
95%
MOT pass rate · 4 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph T 20 (95%) 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 T 20 Triumph Unknown
MOT pass rate 95% ✓ 89%
MOT failure rate 5% ✓ 11%
Faults & advisories per test 0.2 ✓ 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 8,623 mi 16,601 mi
Sample size (vehicles) 4 65,927

Most common faults

Triumph T 20

  1. only to be used during daylight hours and not at times of seriously reduced visibility
  2. Rear Stop lamp does not illuminate immediately a brake applies (1.3.1a)
  3. Steering headbearing has slight free play (2.2.2)

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 T 20 (95%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph T 20 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.