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Triumph Tr6 coupe vs Triumph Unknown: reliability comparison

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

Triumph Tr6 coupe
90%
MOT pass rate · 4 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Tr6 coupe (90%) 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 Tr6 coupe Triumph Unknown
MOT pass rate 90% ✓ 89%
MOT failure rate 10% ✓ 11%
Faults & advisories per test 0.8 0.6 ✓
Dangerous-fault share 0% ✓ 2%
Average mileage 37,888 mi 16,601 mi
Sample size (vehicles) 4 65,927

Most common faults

Triumph Tr6 coupe

  1. Nearside Body has slight corrosion (6.1.B.2)
  2. Offside Rear wheel bearing play detected
  3. offside front noise when suspension lifted
  4. offside rear drive shaft inner UJ joint worn
  5. oil leak from under engine area
  6. speedo cable fouling steering column

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 Tr6 coupe (90%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Tr6 coupe 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.