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Triumph Bonneville bobber tfc vs Triumph Unknown: reliability comparison

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

Triumph Bonneville bobber tfc
94%
MOT pass rate · 96 vehicles
More reliable
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate, the Triumph Bonneville bobber tfc is the more reliable of the two — 94% pass first time versus 89%. It's one signal among several; check the full breakdown below.

Head to head

Measure Triumph Bonneville bobber tfc Triumph Unknown
MOT pass rate 94% ✓ 89%
MOT failure rate 6% ✓ 11%
Faults & advisories per test 0.1 ✓ 0.6
Dangerous-fault share 0% ✓ 2%
Average mileage 2,359 mi 16,601 mi
Sample size (vehicles) 96 65,927

Most common faults

Triumph Bonneville bobber tfc

  1. Exhaust noisy (8.1.1 (a))
  2. Rear reflector missing (4.8.2 (a) (ii))
  3. Central Front Upper Headlamp aim too high (4.1.2 (a))
  4. Headlamp aim too high (4.1.2 (a))
  5. Front Brake pad(s) close to minimum limit (1.1.13 (a))
  6. Rear 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 Bonneville bobber tfc is the more reliable of the two — 94% pass first time versus 89%. It's one signal among several; check the full breakdown below.

Full Triumph Bonneville bobber tfc 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.