The Ultimate Tyre Guide for Licensed Taxi & Private Hire Professionals
As a professional driver, your vehicle is your office and your livelihood. With higher than average annual mileages, your tyres undergo significantly more stress than a standard car.
Maintaining these standards isn’t just about safety—it’s about protecting your Fit and Proper status, your passengers, and your profit margins.
FREE downloadable resources
Free Resources available under the ‘Vehicle Specific Toolkits’ folder here
The A.C.T. Professional Protocol
The A.C.T. check is your daily defence against licensing penalties and roadside prohibitions.
- A — Air Pressure (The Load Factor)
- The Standard – Check pressures weekly when tyres are cold. Pressure must be adjusted based on your typical fare. An under-inflated tyre under heavy load generates excessive heat, which can lead to structural failure.
- The Benefit – Correct pressure can improve fuel economy or battery range by up to 3%, putting money back in your pocket.
- C — Condition (The Sidewall & Age)
- Age Limit (The DOT Code) – Look for the 4-digit code (e.g., 1224 = 12th week of 2024). Many councils now mandate a 10-year maximum age. We recommend increased vigilance after 6 years for professional use due to rubber perishing.
- Visual Integrity – Inspect daily for bulges, cuts, or exposed cords. Fresh kerb damage can be a Do Not Drive defect if you can see the underlying tyre cords.
- T — Tread (The Professional Limit)
- The Standard – While 1.6mm is the legal minimum, TyreSafe recommend considering replacement at 3.0mm, the ‘safety minimum’ and the point at which wet braking distances increase considerably.
- The Fact – At 1.6mm in the wet, your stopping distance can increase by 90 feet (six car lengths) compared to new tyres.
The EV Factor – Heavier & Faster
If you drive an electric PHV or a LEVC Black Cab, your tyres are working harder than ever.
- Instant Torque – EVs deliver power immediately, which can scrub standard tyres down much faster than a conventional internal combustion engine car.
The EV Marking – Always look for EV or XL (Extra Load) markings on the sidewall. These tyres have reinforced internal structures and specialised rubber compounds designed to handle the extra weight of batteries.
Technical Specifications – Load & Speed
Using the wrong Service Description can void your insurance and lead to immediate vehicle prohibition.
- Load Index (e.g., 94) – Indicates the maximum weight a tyre can carry. Because you carry multiple passengers and luggage, you often require Extra Load (XL) tyres. Never fit a tyre with a lower load index than the manufacturer’s specification.
- Speed Rating (e.g., V) – Indicates the tyre’s ability to manage load at speed. Even for city driving, the rating must match your vehicle’s requirements to ensure structural integrity.
Representative Pressure Table – Driver Only vs. Fully Loaded
Note – Always refer to your vehicle’s specific pressure placard (usually on the door jamb or fuel flap).
| Vehicle Type | Driver Only (PSI) | Full Capacity (PSI)* | Difference |
| Standard PHV (e.g., Prius) | 33 Front / 32 Rear | 36 Front / 42 Rear | +31% (Rear) |
| Executive PHV (e.g., E-Class) | 38 Front / 34 Rear | 42 Front / 47 Rear | +38% (Rear) |
| Purpose-Built Taxi (e.g., TX) | 45 Front / 45 Rear | 50 Front / 50 Rear | +11% |
*Full Capacity = 4+ Passengers plus luggage.
Professional Diagnostics – Reading the Wear
Don’t just replace tyres—diagnose why they wore out to save hundreds of pounds in premature wear.
- Wear on both shoulders – Constant under-inflation.
- Wear in the centre – Over-inflation.
- Wear on one edge – Alignment issue (likely from a pothole or kerb strike).
Cupping or Dipping – Suspension or shock absorber failure.
Operational Excellence & Compliance
The Daily 60-Second Walk-around
Incorporate this check into your start-of-shift routine to safeguard your badge
- Visual Walk-around – Check all four tyres for obvious damage or low pressure.
- The Kerb Check – Look for fresh sidewall tears or bulges from the previous shift.
- Directional Check – If directional tyres are fitted, ensure the rotation arrow on the sidewall points forward.
- Valve Caps – Ensure all caps are present to prevent dirt from damaging the seal.
Advanced Fleet Requirements
- Directional Tyres – High-performance tyres must rotate in a specific direction to clear water. If fitted backward, it will fail a compliance test.
- Axle Matching – For balanced braking, tyres on the same axle should be the same make and tread pattern. Mismatched axles can cause the vehicle to pull under emergency braking.
- Remould Tyres – Most councils prohibit remoulds unless they are clearly marked as complying with British Standard BSAU144E.
- Spare Tyres & Run-Flats – Ensure you meet council-specific rules regarding full-sized spares, space-savers (50mph max), or sealant kits. Run-flats require a functioning Tyre Pressure Monitoring System (TPMS).
Winter & All-Season Capability
- Recommendation – Consider All-Season tyres which offer superior grip in slush and rain without the need for seasonal swaps, reducing the risk of incidents that spike insurance premiums.
Puncture Repairs & Second-Hand Risks
- BS AU 159 – All repairs must meet this British Standard. Temporary roadside plugs are not legal for professional passenger-carrying vehicles.
- Used Vehicles – When buying a licensed vehicle, never assume the tyres are correct. Check DOT codes and Load Indexes immediately; mixed and matched tyres are a common hidden risk.
The Swap-Over Warning
Modern enforcement is highly sophisticated. Licensing officers now use Laser Tread Depth Readers and cross-reference MOT API data history. Attempting to use temporary tyres just to pass an inspection is a high-risk strategy that can lead to permanent licence revocation.
The Part-Worn Trap – Hidden Risks & Regulations
For a high-mileage professional, part-worn tyres are rarely the bargain they seem. Under the Motor Vehicle Tyres (Safety) Regulations 1994, the sale of part-worn tyres is legal, but only if they meet extremely strict criteria. Research shows that up to 98% of part-worn tyres sold in the UK do not comply with these safety laws.
The Legal Minimum at Point of Sale
If a retailer sells you a part-worn tyre, it MUST by law meet these standards –
- The “PART-WORN” Stamp – Every tyre must be permanently marked with the words ‘PART-WORN’ in uppercase letters at least 4mm high next to the approval mark.
- Tread Depth – The tyre must have at least 2.0mm of tread across the full breadth and circumference.
- Inflation Test – By law, a part-worn tyre must be inflated to its maximum rated pressure (not just vehicle pressure) and inspected before sale. This reveals bulges or internal separations that are invisible when the tyre is deflated. If a seller hasn’t pressure-tested it in front of you, it is likely illegal.
- Structural Integrity – No cuts over 25mm, no lumps, no bulges, and no exposed cords (internally or externally).
- Repair Standards – Any repair must have been carried out to BS AU 159 (internal patch and external plug).
The False Economy Calculation
Drivers often choose part-worn tyres to save on upfront costs. However, when you calculate the cost per millimetre of usable tread, the maths fails –
- New Tyre – Costs approx. £5.32 per mm of usable tread.
- Part-Worn Tyre – Costs approx. £6.33 per mm of usable tread.
- The Result – You pay 16% more over the life of the tyre, plus the hidden costs of extra fitting fees and more frequent downtime for replacements.
The Danger of Unknown Provenance
Unlike a second-hand car, a tyre has no service history. When you buy part-worn, you are potentially inheriting
- Internal Fatigue – Damage from a previous vehicle that was driven under-inflated, which can lead to a sudden blowout at motorway speeds.
- Impact Damage – Hidden structural weakness from a previous kerb strike or pothole that isn’t visible until the tyre is under full load with passengers.
- The Safety Reject Factor – Ask yourself – Why was this tyre removed from the previous vehicle? Often, they are discards from European countries with higher safety standards or from vehicles involved in accidents.
Professional Standard – As a licensed driver, your Fit and Proper status depends on your judgment. Fitting a tyre of unknown origin is a gamble with your passengers’ safety and your professional badge. Choose New. Choose Certainty.
The Business Case for Safety
- Avoid Fines – One illegal tyre can cost up to £2,500 and 3 points. 4 illegal tyres could cost you your licence!
- Protect Your Status – Licensing officers view poor maintenance as a lack of professional character. A bald tyre is a fast track to a Fit and Proper review.
- Minimise Downtime – Regular checks prevent on-job failures that result in lost fares and expensive emergency call-outs.
Professional Pride – Your vehicle is a reflection of your business. In the eyes of the council, if you don’t care for your equipment, you aren’t caring for your passengers. A.C.T. today.
TyreSafe Partners with The National Private Hire & Taxi Association
TyreSafe acknowledges the help and support of The National Private Hire & Taxi Association in the compilation of this advice.
