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Triumph 250 vs Triumph Unknown: reliability comparison

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

Triumph 250
97%
MOT pass rate · 9 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph 250 (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 250 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 24,388 mi 16,601 mi
Sample size (vehicles) 9 65,927

Most common faults

Triumph 250

  1. No lights fitted at time of test
  2. Nearside Rear Rear wheel bearing has slight play (2.6.2)
  3. Offside Rear Rear wheel bearing has slight play (2.6.2)
  4. Battery insecure (1.9.1)
  5. Nearside Front Rear wheel bearing has excessive play (2.6.2)
  6. Nearside Front Tyre has a tear, caused by separation or partial failure of its structure tread lifting (4.1.D.1b)

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 250 (97%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph 250 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.