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Body & Exhaust Subcategories
Only subcategories containing verified fitment products are shown.
What this collection contains—and what it does not
The handle uses the word “tyre”, but the grouped products are service tools and consumables: gauges, fitting compounds, repair chemicals, emergency sealants, regrooving blades and related kits. Complete road tyres are not the subject of this page. Selection must therefore begin with the operation being performed, not tyre size alone.
A gauge measures; a lubricant supports fitting; cement forms part of an approved repair system; sealant may provide limited temporary mobility; and a regrooving blade removes tread rubber from a purpose-designed commercial casing. Their roles must never be combined into a claim that a worn or damaged tyre has become roadworthy.
Service product groups
| Product type | Intended role | Critical boundary |
|---|---|---|
| Pressure gauge | Measures inflation pressure at the valve. | Range and calibration must suit the vehicle; it does not inflate. |
| Tread-depth gauge | Measures groove depth at selected points. | Condition, cuts, exposure and full-circumference wear still need inspection. |
| Mounting paste/liquid | Reduces fitting friction and supports bead seating. | Must be tyre-approved and used at the stated concentration. |
| Aerosol fitting product | Applies a defined compound in controlled form. | Pressurised/flammable hazards and maker instructions apply. |
| Repair cement | Bonds components within a specified repair system. | Cannot authorise an otherwise prohibited repair. |
| Emergency sealant | May temporarily seal certain small tread penetrations. | Speed/distance limits and professional follow-up are essential. |
| Regrooving blade/kit | Cuts a designed new groove in regroovable tread stock. | Only trained work on explicitly regroovable tyres. |
Pressure measurement and performance
Inflation supports load, controls casing deflection and shapes the contact patch. Underinflation increases flexing and heat; overinflation can reduce compliance and alter wear. Pressure rises as a tyre warms, so routine comparison should follow the vehicle maker's cold-pressure method. Different axles, payloads, towing conditions and wheel/tyre options may have different settings.
Choose a gauge whose working range places the expected pressure well within its scale. Resolution is the displayed increment; accuracy is closeness to the true value. A fine display does not prove calibration. Protect gauges from drops, dirt and liquid sealant, and periodically compare or calibrate them against a traceable reference appropriate to the workshop.
Correct pressure-check sequence
- Find the approved pressure for the exact vehicle, axle, load and tyre setup.
- Check when tyres are cold under the maker's defined conditions.
- Inspect the valve stem and remove the cap without side-loading the valve.
- Apply the gauge squarely until hissing stops and record the stable result.
- Adjust with suitable inflation equipment; do not bleed a hot tyre to its cold figure.
- Repeat the reading and compare with other tyres on the same axle.
- Leak-check a persistently low tyre and refit a sealing valve cap.
- Reset or relearn TPMS only by the vehicle's procedure.
Tread depth and UK legal checks
For most cars and light vehicles covered by the familiar UK rule, tread must be at least 1.6 mm throughout a continuous band comprising the central three-quarters of tread breadth, around the entire circumference. Different rules apply to some vehicle categories, and a tyre can be dangerous or illegal for reasons unrelated to depth. Use current official guidance for the vehicle being assessed.
Measure several grooves at multiple positions while checking shoulders, feathering, local flat spots, cuts, bulges, exposed cords, ageing and foreign objects. Tread-wear indicators are a quick warning but do not replace measurement. The legal minimum is not a recommended wet-weather replacement target.
| Finding | Possible cause | Required response |
|---|---|---|
| Both shoulders worn | Underinflation, overload or severe cornering. | Check pressure history, load and casing condition. |
| Centre worn | Pressure or application mismatch. | Verify specification; do not infer from pattern alone. |
| One shoulder worn | Alignment, camber, wear or repeated road conditions. | Inspect suspension and measure geometry. |
| Cupping/scalloping | Damping, imbalance, joint wear or irregular force variation. | Diagnose vehicle and wheel assembly. |
| Localised bald patch | Lock-up, separation, imbalance or casing fault. | Remove from service for professional assessment. |
| Cord visible/bulge | Structural damage. | Do not drive; repair tools or sealant cannot restore it. |
Mounting compounds
Why lubrication is controlled
A suitable compound lowers friction while the bead passes over the rim flange and helps controlled seating. It should then dry as intended so the tyre does not rotate on the wheel. Excess liquid can pool inside, affect electronics or encourage corrosion.
Chemical compatibility
Tyre rubber, rim coatings and TPMS components need compatible chemistry. Petroleum grease can swell rubber; household detergents may leave water and corrosive salts. Dilute concentrates only as documented, use clean applicators and prevent contamination of the inner liner.
Bead seating safety
Inspect wheel and bead before fitting, use a guarded inflation arrangement appropriate to the assembly and keep the body outside the trajectory zone. Never exceed the tyre/wheel maker's seating limits or use flammable “explosive” seating methods.
Puncture repair boundaries
A proper repair begins after removing the tyre from the wheel for internal examination. Technicians assess penetration position, angle and size, liner condition, evidence of underinflated running, secondary damage and previous repairs. Sidewall, shoulder and structural damage generally sit outside routine tread repair zones. Run-flat and specialist tyres may impose additional restrictions.
Cement is one component in a compatible repair system; it does not work as a standalone filler. Preparation, plug/patch type, drying, stitching and final sealing follow the system instructions and current recognised repair practice. Mixing chemicals and patches from unverified systems can compromise adhesion.
| Repair question | Why it matters | Decision owner |
|---|---|---|
| Where is the injury? | Flex and structural loads vary across crown, shoulder and sidewall. | Trained repairer using the current standard and tyre guidance. |
| How large/angled is it? | Repair units cover stated injury dimensions and paths. | Measured after removal and preparation. |
| Was it driven flat? | Internal abrasion and heat damage may be hidden. | Internal visual/tactile assessment. |
| What tyre construction? | Run-flat, speed category and specialist designs may restrict repair. | Tyre maker and recognised repair procedure. |
| Is sealant present? | It may obscure damage or affect bonding and sensors. | Tell the technician before dismantling. |
| Are cords exposed? | Structural damage cannot be restored by routine sealant or cement. | Remove the tyre from service. |
Emergency sealant limitations
Sealant can sometimes slow air loss from a small tread penetration long enough to reach professional help. It may not seal cuts, sidewall damage, bead leaks, valve faults or a tyre displaced from the rim. Follow the product and vehicle speed, distance, pressure and compatibility limits. Stop if pressure cannot be maintained or the vehicle vibrates.
Sealant aerosols can be pressurised and may contain flammable propellant. Keep away from heat and ignition sources and tell the tyre technician exactly what was used. Some compounds are compatible with pressure sensors when used as instructed; this must not be assumed for every product.
Regrooving: specialist commercial-tyre work
Regrooving cuts extra groove depth into undertread deliberately provided by the tyre manufacturer. Only tyres marked and documented as regroovable should be considered, using the manufacturer's pattern, blade shape, width and depth. The operator must preserve the specified rubber above the structural package.
This is not recutting an ordinary worn passenger tyre. Cutting too deeply can expose belts, increase heat concentration and make the casing unsuitable for further service or retreading. Regrooving tools have heated blades: control temperature, ventilation, hand position and power isolation when changing blades.
Tool and consumable storage
| Item | Storage concern | Pre-use check |
|---|---|---|
| Gauge | Impact, moisture and overpressure. | Zero, hose/chuck condition and calibration status. |
| Paste/concentrate | Freezing, drying and contamination. | Label, mixing ratio, cleanliness and expiry. |
| Cement | Solvent evaporation and ignition sources. | Compatible system, shelf life and ventilation. |
| Aerosol/sealant | Heat, puncture and pressurised container. | Compatibility, damage and date. |
| Regrooving blade | Sharp edge and incorrect profile. | Required width/shape and secure fit in the tool. |
| Service kit | Missing mixed components. | Every part belongs to the approved procedure. |
Common mistakes
- Assuming this collection contains complete tyres.
- Using the sidewall maximum as the normal vehicle pressure.
- Judging all tread from one central reading.
- Using washing-up liquid or oil as mounting lubricant.
- Inflating while leaning over the wheel-and-tyre assembly.
- Repairing without internal inspection.
- Treating emergency sealant as a permanent structural repair.
- Regrooving an unmarked passenger tyre.
- Ignoring gauge calibration because the display has decimals.
MOT, legal and environmental context
UK MOT inspection checks tyre tread, condition, compatibility, valve condition and relevant pressure-monitoring requirements. Construction and Use law applies on the road independently of test timing. A gauge or repair product does not excuse a tyre below the applicable standard. Follow current GOV.UK guidance for vehicle class and tyre type.
Collect removed balance material, rubber, solvent waste and sealant rather than releasing them to drains. Keep volatile products ventilated and away from ignition sources. Tyre inflation and repair should be performed by trained people using maintained equipment and suitable guarding.
Tyre service FAQs
Q: Are complete tyres listed in this collection?
A: No. Its scope is tyre inspection/service tools and consumables.
Q: What pressure should I use?
A: Use the vehicle maker's cold setting for the exact axle, load and tyre specification.
Q: Is the sidewall pressure the normal setting?
A: No. It is not a substitute for the vehicle's specified operating pressure.
Q: What is the UK car tread minimum?
A: Generally 1.6 mm across the central three-quarters and around the full circumference; check current rules for the vehicle class.
Q: Is one tread reading enough?
A: No. Measure across the width and at several points around every tyre.
Q: Can washing-up liquid be used for fitting?
A: No. Use only documented tyre-mounting compound in the specified concentration.
Q: Can puncture cement repair any hole?
A: No. Repairability depends on location, size, construction and internal condition.
Q: Is an external plug a complete repair?
A: Not by itself; a trained internal inspection and approved repair method are required.
Q: Is emergency sealant permanent?
A: No. Observe its limits and obtain professional inspection promptly.
Q: Must I tell a technician about sealant?
A: Yes. It affects safe dismantling, inspection, cleaning and sensor assessment.
Q: Can any worn tyre be regrooved?
A: No. Only tyres explicitly designed and marked for regrooving may be considered.
Q: Does TPMS replace manual checks?
A: No. It warns of certain pressure changes but does not inspect tread or prove correct pressure.
Q: Why calibrate a digital gauge?
A: Display resolution does not prove accuracy; impact and ageing can alter readings.
