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Triumph Street twin 900 vs Triumph Unknown: reliability comparison

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

Triumph Street twin 900
86%
MOT pass rate · 1 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Street twin 900 (86%) 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 Street twin 900 Triumph Unknown
MOT pass rate 86% 89% ✓
MOT failure rate 14% 11% ✓
Faults & advisories per test 0.6 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 4,750 mi 16,601 mi
Sample size (vehicles) 1 65,927

Most common faults

Triumph Street twin 900

  1. Front Tyre worn close to the legal limit front tyre close to wear limit(measured 2mm) (5.2.3 (e))
  2. Direction indicator not working When indicator switch applied all directional indicators not working (4.4.1 (a) (ii))
  3. Front Tyre worn close to the legal limit (5.2.3 (e))

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 Street twin 900 (86%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Street twin 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.