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Triumph Datona 900 vs Triumph Unknown: reliability comparison

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

Triumph Datona 900
82%
MOT pass rate · 1 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Datona 900 (82%) 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 Datona 900 Triumph Unknown
MOT pass rate 82% 89% ✓
MOT failure rate 18% 11% ✓
Faults & advisories per test 0.1 ✓ 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 18,751 mi 16,601 mi
Sample size (vehicles) 1 65,927

Most common faults

Triumph Datona 900

  1. Rear Brake disc(s) cracked (3.2.A1g)
  2. Tyre tread depth is below minimum requirements of 1.0mm (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 Datona 900 (82%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Datona 900 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.