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Triumph 1500 vs Triumph Bonneville street twin: reliability comparison

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

Triumph 1500
74%
MOT pass rate · 37,142 vehicles
Triumph Bonneville street twin
94%
MOT pass rate · 719 vehicles
More reliable
Verdict: On MOT pass rate, the Triumph Bonneville street twin is the more reliable of the two — 94% pass first time versus 74%. It's one signal among several; check the full breakdown below.

Head to head

Measure Triumph 1500 Triumph Bonneville street twin
MOT pass rate 74% 94%
MOT failure rate 26% 6%
Faults & advisories per test 2.3 0.2
Dangerous-fault share 0% 5%
Average mileage 58,068 mi 6,138 mi
Sample size (vehicles) 37,142 719

Most common faults

Triumph 1500

  1. Parking brake: efficiency below requirements (3.7.B.7)
  2. Windscreen washer provides insufficient washer liquid (8.2.3)
  3. Nearside Rear wheel bearing has slight play (2.6.2)
  4. Offside Rear wheel bearing has slight play (2.6.2)
  5. Brakes imbalanced across an axle (3.7.B.5b)
  6. Oil leak

Triumph Bonneville street twin

  1. Front Tyre worn close to the legal limit (5.2.3 (e))
  2. Front Brake pad(s) close to minimum limit (1.1.13 (a))
  3. Rear Tyre worn close to the legal limit (5.2.3 (e))
  4. Front Brake indicates slight fluctuation of brake effort (1.2.1 (e))
  5. Headlamp aim too low (4.1.2 (a))
  6. Drive chain slightly loose (6.1.7 (c) (i))

Reliability FAQ

On MOT pass rate, the Triumph Bonneville street twin is the more reliable of the two — 94% pass first time versus 74%. It's one signal among several; check the full breakdown below.

Full Triumph 1500 report Full Triumph Bonneville street twin 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.