TireFitLab

Ownership and maintenance

Ownership and maintenance

Pressure, age, wear, cost and service decisions after the tires are fitted.

FAQ

Ownership and maintenance
Pressure, age, wear, cost and service decisions after the tires are fitted.
What should I verify before using this information?
Use TireFitLab values as a sizing reference, then verify the vehicle handbook, tire placard, rim compatibility, load rating, and physical clearance before fitting.
Tire age & DOT date code guide How to find and decode the DOT date code on your tire sidewall to determine its manufacturing week and year, and when to replace old tires. Tire pressure guide What PSI should your tires be? How to find the correct pressure, what the TPMS light means, effects of over- and under-inflation, and how temperature changes pressure. Cold tyre pressure guide How cold tyre pressure works: the 1 PSI per 10°F (0.1 bar per 8°C) temperature rule, when to check pressure (cold only), morning vs driven-tyre readings, altitude effects, and seasonal adjustment. Tyre pressure for heavy loads and towing When and how to increase tyre pressure for heavy loads: XL (Extra Load) tyre pressure requirements, laden vs unladen recommended pressure, adjusting rear axle pressure when towing, front vs rear axle pressure differences, and what happens when you tow on under-inflated tyres. Trailer and caravan tyre pressure guide Correct tyre pressure for trailers, caravans, and horse boxes: why trailer tyres are inflated much higher than car tyres, how to find the right spec, load-dependent pressures, and the consequences of under-inflation on a towed vehicle. Tire rotation guide How often should you rotate your tires? Recommended intervals, the best rotation patterns for FWD/RWD/AWD, and what happens if you skip it. Tyre storage guide How to store winter or summer tyres correctly. Best conditions, stacking vs hanging vs upright, recommended pressure, bags vs bare, and how long tyres can safely be stored. TPMS guide How TPMS works: direct (pressure sensor in each wheel) vs indirect (ABS wheel-speed comparison), what the warning light means, when to reset, and what TPMS cannot detect. Tyre valve types: TR413, TPMS sensors, and metal valves Tyre valve types explained: TR413 rubber snap-in vs metal clamp-in vs TPMS sensor valves, maximum pressure ratings, replacement intervals, valve core maintenance, why bent valve stems should not be straightened, and what happens if a valve leaks. Tyre noise guide Why tyres make noise: tread-pattern hum, road surface resonance, cupping, and cavity noise. How to identify which tyre is loud and what to do about it. Tyre wear rate guide How long tyres last: typical km per mm of tread depth by tyre category, factors that accelerate wear (speed, temperature, pressure, alignment, driving style), UTQG treadwear index explained, and when to replace. Tyre wear patterns: what uneven wear means and what causes it Tyre wear pattern guide: centre tread wear (over-inflation — contact patch concentrated at centre), shoulder wear both sides (under-inflation — shoulders carry the load), one-sided shoulder wear (camber misalignment — tyre leans in or out, one edge wears faster), cupping/scalloping (worn shock absorbers — tyre bounces and makes intermittent contact), heel-toe wear (natural wear pattern on non-driven axle, accelerated by misalignment), patchy/spotty wear (wheel out of balance, brake caliper sticking, severe camber), and feathering (toe misalignment — tyre faces slightly inward or outward, edges of tread blocks wear at different rates). Tyre cracking and ageing guide Tyre cracking causes: ozone craze, UV degradation, thermal cycling, and storage conditions. How to assess crack severity, when surface cracks are cosmetic vs structural, the 6-year age rule, and how to slow rubber ageing. Tyre flat spots: causes, permanent vs temporary, and how to fix them Tyre flat spot guide: what causes flat spots (long parking, panic braking, ABS lockup on worn tyres, storage), the difference between temporary cold flat spots (disappear after warm-up) and permanent flat spots (deformed tyre body requiring replacement), how to identify flat spot vibration, when a flat spot will go away on its own, and when the tyre must be replaced. Tyre compound guide How tyre rubber compounds work: glass transition temperature, silica vs carbon black filler, summer vs winter compound differences, and how compound affects wet grip and rolling resistance. Tyre tread pattern guide The four main tyre tread pattern types: directional, asymmetric, symmetric, and block — how each affects wet grip, noise, aquaplaning resistance, and correct fitment direction. Tyre mixing guide When mixing tyres is legal, when it is dangerous, and the rules: same-axle matching, summer/winter mixing, run-flat with standard, and EU/UK/DE/US regulations on tyre mixing. Tyre fitting and mounting cost guide Tyre fitting and mounting costs explained: what a tyre shop charges, what is included (mounting, balancing, disposal, valve), extras (TPMS service, alignment, nitrogen), price ranges by tyre size and region, and tips to avoid overpaying. Tyre recycling guide What happens to old tyres: illegal dumping law, rubber crumb applications, tyre-derived fuel, devulcanisation, EU End-of-Life Vehicle rules, how to dispose of tyres legally. Tyre retreading guide Tyre retreading explained: the process of applying new tread rubber to a worn casing, safety standards (TRA, ECE R109), who uses retreads (trucks, aircraft, buses), whether retreads are legal and safe for passenger cars, and environmental benefits. Tyre warranty guide How tyre warranties work: manufacturer defect coverage, what voids warranty (road hazard, under-inflation, mounting damage), pro-rata tread wear warranties, and how to make a claim. Tyre road hazard warranty: what is covered, what is excluded, and how to claim Road hazard tyre warranty guide: what counts as a road hazard (nails/screws, potholes, sharp road debris causing irreparable damage), what is not covered (repairable punctures, gradual wear, vandalism, improper inflation, curb damage, accidents), how pro-rata replacement credit works, claim procedure (when and where to go), the difference from manufacturer defect warranty, and whether road hazard protection is worth buying. Tyre rolling resistance: how it works, fuel economy impact, and what the EU label A–G means Rolling resistance tyre guide: physics (hysteretic deformation cycle, energy lost as heat per revolution), rolling resistance coefficient (Crr) — typical values 0.006–0.015, EU Tyre Label fuel efficiency grades A through G (A saves ~0.5 L/100km vs G), relationship between compound softness and rolling resistance vs wet grip, how inflation pressure affects rolling resistance, EV tyres and rolling resistance, and how to read the EU label to choose the right balance for your use case. Tyre contact patch: what it is, how big it is, and why it determines braking, cornering, and aquaplaning Tyre contact patch guide: what the contact patch is (typically 15–20 cm long × section width wide for a passenger car tyre at normal load and pressure — roughly the size of a human hand), how contact patch area is determined by vehicle weight and tyre pressure rather than tyre width alone (P = F/A means contact patch area ≈ load ÷ pressure), how tyre width shifts the patch shape from long-and-narrow to short-and-wide, why wider contact patch improves dry cornering but wider tyres do NOT automatically improve wet grip, the role of tread grooves in evacuating water from the contact patch, and the relationship between contact patch shape and braking distance. Tyre cornering stiffness and slip angle: how tyres generate lateral force and what affects grip Tyre cornering stiffness guide: what slip angle is and why it exists (as a tyre turns, the contact patch deforms laterally, creating a difference between the direction the wheel points and the actual path of travel), how lateral force increases with slip angle up to the peak slip angle (typically 6–12° for road tyres), what happens beyond peak slip angle (lateral force drops and the tyre slides), cornering stiffness coefficient (Cα — lateral force per degree of slip angle), understeer (front tyres reach peak slip angle before rears — car washes wide), oversteer (rear tyres slide first — car rotates), and the practical effects of tyre width, compound softness, inflation pressure, load, and tread depth on cornering stiffness. Directional vs non-directional tyres: how to identify them, fitting rules, and rotation patterns Directional tyre guide: how to identify directional tyres (V-shaped tread pointing toward the car when viewed from the front, arrow or ROTATION label on sidewall), why the direction matters (aquaplaning resistance, wet braking, noise), consequences of fitting backwards (reduced wet drainage, increased aquaplaning risk), rotation rules (directional can only swap front-rear on the same side, cannot be cross-rotated without demounting), asymmetric tyre orientation (OUTSIDE label must face out), and whether a directional tyre can be used as a spare in an emergency. Nitrogen vs air in tyres Nitrogen vs air in tyres: does nitrogen keep pressure more stable, reduce moisture, and extend tyre life? Science-based comparison — when it matters and when it does not. EU tyre label guide How to read the EU tyre label: fuel efficiency grades A–E, wet braking grades A–E, exterior noise in dB and 1–3 waves, and what each rating means for real-world driving. UTQG ratings explained: treadwear, traction, and temperature grades on your tyre sidewall UTQG (Uniform Tire Quality Grading) guide: treadwear index (100 = reference, 200 = twice as long, 50 = half as long), traction grade (AA best wet stopping to C minimum), temperature grade (A best heat resistance to C minimum), what UTQG does not measure (dry grip, handling, hydroplaning, winter traction), which tyres are exempt (winter tyres, T-type spare, competition tyres), and how to compare UTQG ratings when buying.

More tools

Seasonal check

Planning a long summer drive?

Use the budget and running-cost tools before a trip, especially if the current tyres are worn or the replacement size changes diameter.

Estimate tyre budget
Last reviewed: 2026-06-28
What changed
  • Added pillar pages for the existing guide bundle taxonomy.