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Triumph Tr6c vs Triumph Unknown: reliability comparison

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

Triumph Tr6c
88%
MOT pass rate · 98 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Tr6c (88%) 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 Tr6c Triumph Unknown
MOT pass rate 88% 89% ✓
MOT failure rate 12% 11% ✓
Faults & advisories per test 0.5 ✓ 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 11,599 mi 16,601 mi
Sample size (vehicles) 98 65,927

Most common faults

Triumph Tr6c

  1. No lights fitted at time of test
  2. Exhaust noisy (7.1.2)
  3. Steering headbearing has slight free play (2.2.2)
  4. Front Wheel has a slightly distorted bead rim. (4.2.2)
  5. Rear Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
  6. Rear Tyre worn close to the legal limit (4.1.3(ii))

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 Tr6c (88%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Tr6c 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.