MOT performance
MOT failure “Size/type: of different sizes are fitted on the same axle.”: how common it is and which cars get it
“Size/type: of different sizes are fitted on the same axle.” (major defect, tyres) was recorded as a failure on 0.10% of UK MOT tests in 2023–2024: 68,463 tests, the number 92 most common failure item. It is 2.3 times as common at 10 years old (0.10%) as at 3 (0.04%). It is most common at 17 years old (0.22% of tests).
68,463 tests with this failure, 2023–2024
Check a specific car's MOT history and running costsAt a glance
| Figure | Value | Basis |
|---|---|---|
| Share of MOT tests | 0.10% | 68,463 tests, 2023–2024 |
| Rank among failure items | #92 | by number of tests |
| Most common at | 17 years old | 0.22% of tests at that age |
| Models compared | 283 | models with enough tests |
How it changes with age
By fuel
Diesel: 0.11% of tests; Petrol: 0.11% of tests; Electric: 0.06% of tests; Hybrid: 0.05% of tests. Fuel groups differ in age and mileage, so these raw shares are not like-for-like; the model tables below are.
Models that fail on it most often
Relative to cars of the same age and fuel (1.00 = national rate for this item). Only models with enough tests for the difference to be clear are ranked.
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| Smart Forfour | 48,547 | 0.26% | +248% |
| Renault Twingo | 51,208 | 0.32% | +166% |
| Vauxhall Corsa | 1,866,540 | 0.29% | +162% |
| Vauxhall Astravan | 17,586 | 0.47% | +146% |
| Ford Fiesta | 2,842,979 | 0.27% | +142% |
| Jaguar XE | 87,969 | 0.14% | +133% |
| Vauxhall Combo | 216,750 | 0.24% | +123% |
| Renault Trafic | 218,161 | 0.24% | +121% |
| Peugeot Bipper | 41,750 | 0.24% | +99% |
| Renault Laguna | 20,878 | 0.36% | +97% |
Models that fail on it least often
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| Porsche 911 | 100,223 | 0.01% | -96% |
| Suzuki Jimny | 48,973 | 0.01% | -92% |
| Bentley Continental | 29,070 | 0.01% | -90% |
| Porsche Cayman | 29,543 | 0.01% | -89% |
| Porsche Boxster | 65,604 | 0.02% | -87% |
| Toyota Land Cruiser | 43,545 | 0.02% | -84% |
| BMW M3 | 31,544 | 0.02% | -84% |
| Porsche Cayenne | 59,466 | 0.02% | -83% |
| Hyundai Santa Fe | 67,599 | 0.02% | -82% |
| Mercedes-Benz SL | 43,454 | 0.03% | -80% |
About this defect
The wording is DVSA's, from the MOT inspection manual. A high ratio for a model reflects its MOT record, which depends on maintenance and use as well as design. For one car, its own MOT history shows whether this has come up before.
Other common tyres failures
- Tread depth: tread depth below requirements of 1.6mm · 2.44% of tests
- Condition: has ply or cords exposed · 1.36% of tests
- Condition: has a cut in excess of the requirements deep enough to reach the ply or cords · 1.31% of tests
- Condition: has a tear, caused by separation or partial failure of its structure · 0.56% of tests
- Condition: has a bulge, caused by separation or partial failure of its structure · 0.47% of tests
- Tyre pressure monitoring system: malfunctioning or obviously inoperative · 0.36% of tests
- Condition: has a lump, caused by separation or partial failure of its structure · 0.18% of tests
- Tread depth: tread pattern not visible over the whole tread area when minimum depth required is 1.0mm · 0.13% of tests
Check the car you are looking at
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UK number plate or 17-character VIN
About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.