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Triumph Speed twin 500 vs Triumph Unknown: reliability comparison

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

Triumph Speed twin 500
95%
MOT pass rate · 4 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Speed twin 500 (95%) 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 Speed twin 500 Triumph Unknown
MOT pass rate 95% ✓ 89%
MOT failure rate 5% ✓ 11%
Faults & advisories per test 0.5 ✓ 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 27,823 mi 16,601 mi
Sample size (vehicles) 4 65,927

Most common faults

Triumph Speed twin 500

  1. Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
  2. Rear Rear wheel bearings have slight free play (2.4.A.2c)
  3. front mudguard missing
  4. No lights fitted at time of test
  5. daylight use only
  6. Front Wheel has a slightly distorted bead rim. (4.2.2)

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 Speed twin 500 (95%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Triumph Speed twin 500 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.