1975 Triumph Stag — MOT History by Age

How cars manufactured in 1975 perform at MOT as they age

51 years

Current Age

80.9%

Latest Pass Rate

3,532

Total Tests (All Years)

51,945 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Insufficient data for same-age comparison.

How This Car Ages

Pass rate progression for the 1975 Triumph Stag as it ages.

34 yrs67.0%

→ ↓0.4%

35 yrs66.6%

→ ↓1.6%

36 yrs65.0%

→ ↑2.4%

37 yrs67.4%

→ ↑1.2%

38 yrs68.6%

→ ↓5.1%

39 yrs63.5%

→ ↑9.6%

40 yrs73.1%

→ ↓3.2%

41 yrs69.9%

→ ↑2.4%

42 yrs72.3%

→ ↓3.1%

43 yrs69.2%

→ ↑12.5%

44 yrs81.7%

→ ↓2.8%

45 yrs78.9%

→ ↓4.4%

46 yrs74.5%

→ ↑6.8%

47 yrs81.3%

→ ↓9.2%

48 yrs72.1%

→ ↑8.8%

49 yrs80.9%

📊 View as table

Age	Pass Rate	Tests
34 yrs	67.0%	300
35 yrs	66.6%	305
36 yrs	65.0%	309
37 yrs	67.4%	298
38 yrs	68.6%	306
39 yrs	63.5%	312
40 yrs	73.1%	323
41 yrs	69.9%	342
42 yrs	72.3%	314
43 yrs	69.2%	146
44 yrs	81.7%	109
45 yrs	78.9%	90
46 yrs	74.5%	102
47 yrs	81.3%	80
48 yrs	72.1%	86
49 yrs	80.9%	110

Pass Rate Trend

How the 1975 Triumph Stag pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2024 (49 yrs)	80.9%	110
2023 (48 yrs)	72.1%	86
2022 (47 yrs)	81.3%	80
2021 (46 yrs)	74.5%	102
2020 (45 yrs)	78.9%	90
2019 (44 yrs)	81.7%	109
2018 (43 yrs)	69.2%	146
2017 (42 yrs)	72.3%	314
2016 (41 yrs)	69.9%	342
2015 (40 yrs)	73.1%	323
2014 (39 yrs)	63.5%	312
2013 (38 yrs)	68.6%	306
2012 (37 yrs)	67.4%	298
2011 (36 yrs)	65%	309
2010 (35 yrs)	66.6%	305
2009 (34 yrs)	67%	300

Year-by-Year MOT Results

2009

67.0%

Age (yrs) 34Tests 300Avg Mileage 54,497Top Failure Lamps, Reflectors and Electrical Equipment — 17.3%

2010

66.6%

Age (yrs) 35Tests 305Avg Mileage 51,951Top Failure Brakes — 17.7%

2011

65.0%

Age (yrs) 36Tests 309Avg Mileage 51,525Top Failure Lamps, Reflectors and Electrical Equipment — 20.7%

2012

67.4%

Age (yrs) 37Tests 298Avg Mileage 52,021Top Failure Suspension — 16.1%

2013

68.6%

Age (yrs) 38Tests 306Avg Mileage 51,558Top Failure Lamps, Reflectors and Electrical Equipment — 32.4%

2014High Fail Rate

63.5%

Age (yrs) 39Tests 312Avg Mileage 52,441Top Failure Suspension — 45.5%

2015

73.1%

Age (yrs) 40Tests 323Avg Mileage 51,717Top Failure Lamps, Reflectors and Electrical Equipment — 32.8%

2016

69.9%

Age (yrs) 41Tests 342Avg Mileage 53,053Top Failure Suspension — 29.5%

2017

72.3%

Age (yrs) 42Tests 314Avg Mileage 49,235Top Failure Suspension — 30.6%

2018

69.2%

Age (yrs) 43Tests 146Avg Mileage 49,276Top Failure Suspension — 22.6%

2019

81.7%

Age (yrs) 44Tests 109Avg Mileage 45,882Top Failure Brakes — 18.3%

2020

78.9%

Age (yrs) 45Tests 90Avg Mileage 50,095Top Failure Brakes — 26.7%

2021

74.5%

Age (yrs) 46Tests 102Avg Mileage 46,151Top Failure Brakes — 18.6%

2022

81.3%

Age (yrs) 47Tests 80Avg Mileage 46,824Top Failure Suspension — 20.0%

2023

72.1%

Age (yrs) 48Tests 86Avg Mileage 49,118Top Failure Suspension — 38.4%

2024

80.9%

Age (yrs) 49Tests 110Avg Mileage 51,945Top Failure Suspension — 18.2%

MOT results for 1975 Triumph Stag by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	34	67.0%	300	54,497	Lamps, Reflectors and Electrical Equipment — 17.3%
2010	35	66.6%	305	51,951	Brakes — 17.7%
2011	36	65.0%	309	51,525	Lamps, Reflectors and Electrical Equipment — 20.7%
2012	37	67.4%	298	52,021	Suspension — 16.1%
2013	38	68.6%	306	51,558	Lamps, Reflectors and Electrical Equipment — 32.4%
2014	39	63.5%	312	52,441	Suspension — 45.5%
2015	40	73.1%	323	51,717	Lamps, Reflectors and Electrical Equipment — 32.8%
2016	41	69.9%	342	53,053	Suspension — 29.5%
2017	42	72.3%	314	49,235	Suspension — 30.6%
2018	43	69.2%	146	49,276	Suspension — 22.6%
2019	44	81.7%	109	45,882	Brakes — 18.3%
2020	45	78.9%	90	50,095	Brakes — 26.7%
2021	46	74.5%	102	46,151	Brakes — 18.6%
2022	47	81.3%	80	46,824	Suspension — 20.0%
2023	48	72.1%	86	49,118	Suspension — 38.4%
2024	49	80.9%	110	51,945	Suspension — 18.2%

Common MOT Failures

Top failure categories across all test years for 1975 Triumph Stag, with age trends.

Lamps, Reflectors and Electrical Equipment

23.7%

↓ Decreases with age

Suspension

22.6%

— Consistent

Brakes

20.2%

↓ Decreases with age

Lamps, reflectors and electrical equipment

18.9%

— Consistent

Steering

12.4%

↑ Increases with age

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Brakes	14.3% (34 yrs)	9.1% (49 yrs)	-5.2%	🟢 ↓
Suspension	17.3% (34 yrs)	18.2% (49 yrs)	+0.9%	⚪ —

Other Manufacture Years

1970 1971 1972 1973 1974 1975 1976 1977 1978

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About This Data

This page shows how Triumph Stag cars manufactured in 1975 perform at MOT as they age. Data spans from 2009 to 2024, covering 3,532 tests. Pass rates naturally decline with age as components wear.

Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.