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Triumph T509 speed tripple vs Triumph Unknown: reliability comparison

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

Triumph T509 speed tripple
74%
MOT pass rate · 1 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph T509 speed tripple (74%) 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 T509 speed tripple Triumph Unknown
MOT pass rate 74% 89% ✓
MOT failure rate 26% 11% ✓
Faults & advisories per test 1.0 0.6 ✓
Dangerous-fault share 0% ✓ 2%
Average mileage 45,364 mi 16,601 mi
Sample size (vehicles) 1 65,927

Most common faults

Triumph T509 speed tripple

  1. Front Tyre worn close to the legal limit (4.1.3(ii))
  2. Exhaust noisy (7.1.2)
  3. Rear Brake disc(s) slightly worn (3.2.A1l)
  4. Nearside Front Footrest slightly loose (6.2.12 (a))
  5. Rear Wheel bearing has slight play (5.1.3 (a) (i))
  6. Nearside Front Shock absorber has a light misting of oil fork leg (5.3.2 (b))

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 T509 speed tripple (74%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph T509 speed tripple 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.