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Triumph Thunderbord storm vs Triumph Unknown: reliability comparison

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

Triumph Thunderbord storm
78%
MOT pass rate · 1 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Thunderbord storm (78%) 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 Thunderbord storm Triumph Unknown
MOT pass rate 78% 89% ✓
MOT failure rate 22% 11% ✓
Faults & advisories per test 0.9 0.6 ✓
Dangerous-fault share 0% ✓ 2%
Average mileage 25,523 mi 16,601 mi
Sample size (vehicles) 1 65,927

Most common faults

Triumph Thunderbord storm

  1. Offside Front Brake pad(s) close to minimum limit (1.1.13 (a))
  2. Rear Brake pad(s) close to minimum limit (1.1.13 (a))
  3. Front Brake pad(s) less than 1.5 mm thick (3.2.A1f(i))
  4. Headlamp aim unable to be tested (4.1.2 (b))
  5. Headlamp not working on dipped beam (4.1.1 (a) (ii))
  6. Nearside Front Position lamp not working (4.2.1 (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 Thunderbord storm (78%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Thunderbord storm 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.