Skip to content

Triumph Rocket vs Triumph Unknown: reliability comparison

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

Triumph Rocket
92%
MOT pass rate · 590 vehicles
More reliable
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate, the Triumph Rocket is the more reliable of the two — 92% pass first time versus 89%. It's one signal among several; check the full breakdown below.

Head to head

Measure Triumph Rocket Triumph Unknown
MOT pass rate 92% ✓ 89%
MOT failure rate 8% ✓ 11%
Faults & advisories per test 0.4 ✓ 0.6
Dangerous-fault share 6% 2% ✓
Average mileage 17,197 mi 16,601 mi
Sample size (vehicles) 590 65,927

Most common faults

Triumph Rocket

  1. Exhaust noisy (8.1.1 (a))
  2. Front Tyre worn close to the legal limit (5.2.3 (e))
  3. Rear Tyre worn close to the legal limit (5.2.3 (e))
  4. Rear Brake pad(s) close to minimum limit (1.1.13 (a))
  5. Front Brake indicates slight fluctuation of brake effort (1.2.1 (e))
  6. Front Brake pad(s) close to minimum limit (1.1.13 (a))

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 Rocket is the more reliable of the two — 92% pass first time versus 89%. It's one signal among several; check the full breakdown below.

Full Triumph Rocket 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.