Skip to content

Triumph Tt vs Triumph Unknown: reliability comparison

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

Triumph Tt
97%
MOT pass rate · 15 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Tt (97%) 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 Tt Triumph Unknown
MOT pass rate 97% ✓ 89%
MOT failure rate 3% ✓ 11%
Faults & advisories per test 0.2 ✓ 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 10,377 mi 16,601 mi
Sample size (vehicles) 15 65,927

Most common faults

Triumph Tt

  1. No lights fitted at time of test
  2. Only used during daylight hours, Not to be used at times of seriously reduced visibility
  3. Exhaust noisy (7.1.2)
  4. lighting equipment not fitted
  5. Front Steering linkage has slight free play (2.2.2)
  6. Oil leak

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 Tt (97%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Tt 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.