Mounting Procedures | Diamond Tyres

Correct mounting and demounting of Diamond Tyres and inner tubes are essential for maximum road safety, optimal vehicle performance, and maximum tread life. Tyre mounting is a specialized technical procedure that should be performed only by trained professionals using proper tools, calibrated equipment, and strict adherence to industry standards.

Safety Warnings & Equipment Protocols

⚠️ WARNING: Tyres and wheels operate under high inflation pressures. Exceeding rated pressures or using improper mounting techniques may cause the tyre or wheel assembly to burst, resulting in severe or fatal injury.

Essential Workshop Safety Rules

●       Use Pressure Regulators: Always use inline pressure regulators on supply lines to prevent accidental over-pressurization.

●       Regulate Line Pressure: Supply line pressure must be regulated to no more than 50% higher than the tyre's recommended service pressure.

●       Inflation Safety Cages: All newly assembled tyre and wheel combinations must be inflated inside an approved safety cage or behind a safety barrier.

●       Use Proper Accessories: Always inflate using a clip-on air chuck, an extension hose with an inline valve, and a calibrated dial or digital pressure gauge.

●       Never Exceed Ratings to Seat Beads: Never exceed the maximum rated inflation pressure stated on the tyre sidewall to force the beads to seat against the wheel flange.

Wheel Inspection & Compatibility

Modern demountable, split, or spoke-supported wheels make physical mounting easier, but require strict attention to mechanical detail:

  1. OEM Guidelines: Always follow specific wheel assembly and bolt-torque instructions provided by the vehicle or wheel manufacturer.
  2. Surface Inspection: Inspect wheels for cracks, rust, burrs, or bead flange corrosion before fitting a new tyre. Damaged or cracked rims must be repaired or replaced immediately.
  3. Bead Lubrication: To facilitate smooth seating of the beads against wheel flanges, apply a light coat of talc powder or an approved, non-petroleum rubber lubricant to the bead seat area.

Tube-Type Mounting Instructions

Using proper procedures during tube installation prevents pinch flats, premature air loss, and internal friction damage.

1. Always Use a New Tube

Never reuse an old tube with a new tyre. In-service tubes stretch over time—taking a permanent set up to 25% larger than their original size. Reusing a stretched tube inside a new tyre causes folding, wrinkling, and rapid tube failure.

2. Assembly & Installation Steps

●       Inspect the Tyre Interior: Remove any manufacturing stickers, labels, or foreign debris from inside the casing. Wipe the innerliner clean.

●       Inspect the Tube: Check the new tube for pinholes, splits, or stem damage. Inflate slightly—just enough to round out its shape. (Note: Do not over-inflate an unmounted tube, as this strains splices and stretches the rubber excessively.)

●       Dust with Talc: Lightly dust the inside of the tyre and the tube with talc to reduce friction during mounting.

●       Align Valve & Balance Dot: Insert the tube into the tyre, aligning the valve stem with the red balance dot marked on the tyre sidewall.

●       Torque Wheel Bolts: Assemble the wheel halves (if split-rim) and torque all bolts to the manufacturer’s exact specifications prior to full inflation.

●       Stretch & Equalize:

1.      Inflate the assembly inside a safety cage to rated pressure to seat the beads.

2.      Fully deflate the assembly to release any trapped air and equalize tube stretch.

3.      Re-inflate to rated operating pressure.

Managing Pressure Loss & Troubleshooting

A freshly mounted tyre/wheel assembly must undergo a 12 to 24-hour stretch period before being placed into full service. All bias-ply tyres stretch after initial mounting, which naturally drops internal pressure.

If an assembly loses more than 5% of its inflation pressure within 24 hours after mounting, do not place it into service. Follow these troubleshooting steps:

Phase 1: External Leak Diagnostics

  1. Apply a soap-and-water solution to the valve core, stem base, rim flange, and pressure release plugs.
  2. If bubbles appear, tighten or replace the valve core, replace damaged seals, or retorque hardware as needed.
  3. If no external leaks are detected, proceed to internal inspection.

Phase 2: Internal Rim & Casing Inspection

  1. Perform a 24-hour diffusion test. If pressure loss still exceeds 5%, disassemble the tyre and wheel.
  2. Submerge the wheel assembly in water to check for rim porosity, cracks, or fuse plug failure.
  3. Inspect rubber O-ring seals for pinching, degradation, or incorrect sizing.
  4. Check the tread and sidewalls for puncture damage. Any tyre casing found with a puncture must be scrapped.

Pro Tip: Always fit a high-quality, gasket-sealed metal or hard-plastic valve cap to keep dirt, water, and road grime out of the valve core.

Emergency Tyre Stretch Procedure

In urgent operational situations where a newly mounted tyre cannot undergo the standard 12-hour resting period before use:

  1. Inflate to 105%: Inflate the assembly to 105% of the unloaded cold service pressure.
  2. Leak Inspection: Spray the entire tyre, bead flange, and valve stem with a soap-and-water solution.
  3. Evaluate Performance:

○       Abnormal Leakage (Continuous stream of bubbles): Rebuild the assembly immediately according to standard procedures.

○       No Leakage: The vehicle may enter service provided cold tyre pressure is re-checked before every ride for the next 48 hours and re-inflated as necessary.

Need Further Assistance?

Proper mounting is the foundation of tyre performance. By utilizing correct tools, fresh tubes, precision balancing, and thorough leak-testing, you maximize the lifespan of your Diamond Tyres while keeping your ride safe and smooth.

For additional technical queries, rim compatibility guides, or service assistance, contact an authorized Diamond Tyres service center or reach out to our Customer Support team.