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Technical data

Tyres are the only parts of the vehicle, which are in contact with the road. Safety in acceleration, breaking, steering, and cornering – all depends on relatively small area of the road contact.
It is therefore of paramount importance that tyre should be maintained in good condition at all times.

  • Maintain correct inflation pressure.
  • Check periodically for misalignment, balance, and mechanical irregularities.
  • Regular maintenance f steering and suspension components
  • Avoid harsh breaking. Rapid acceleration. and fast cornering.
  • Do not over load.
  • Retread the tyres with Teeson precured Treads.

  • Requirement of a Tyre  
  • Types of Tyres  
  • Tyre ply Rating  
  • Tyre positional Rotations  
  • Keep up the pressure  
  • Cushioning ability
  • Tyre dimensions
  • Maximum load carrying capacity
  • Durability
  • Corning and stability
  • Low rolling resistance
  • Tyre pneumatics

Tyres are manufactured in three different types of construction

Cross or Diagonal ply

Radial

Bias-Belted

Cross ply tyres have textile casing cords running diagonally from head o head

Radial ply tyres may be either steel or textile braced.

Bias Belted tyres have textile causing cords running diagonally and a belt of textile cords under the tread.


How to find the Dimensions?

Example:

W (Inches) D (Inches) W*D
10 20 10.00x20
7 15 7.00x15
6 16 6.00x16

Tyre Ply Rating is used to identify a given tyre with its maximum recommended load when used in a specific type of service. It is an index of tyre strength And does not represent the number of codes plies in the Tyre.

Rotations is always advisible for uniform pattern of wear on all wheel positions to achieve optimum Tyre life.

The advantages of correct inflation pressure are: Long tyre life, Optimum fuel consumption, Reduced slip, comfort.

Under Inflation Crrect Inflation Over Inflation

20% under inflation means 26% reduction in mileage!

Under inflation No.1 Tyre killer

Under inflation permits excessive flexing, which builds up heat, weakering rubber and fabric causing premature tread wear.


  • Basic Tyre Patterns  
  • Correct Mounting Of Twin Tyres  
  • What Is Retreading?  
  • Tread wear  
  • Defects of Casing, Which Should Be Rejected For Retreading  
  • Mechanical Problems that cause irregular wear of tyre  
  • New Methods to find out Defects of Casing  
Rib Lug Semi Lug

Tyre o be twined should have the same diameter

Having fitted and inflated the tyre, check that they are of similar diameter by comparing their heights when placed along side each Other of a flat surface or new string gauge, large L-square. Difference up to 30mm for 9.00-20 and up is permissible.

They should be inflated to the same pressure.

Retreading is the general term for tyre reconditioning which extends the useful life of the tyre by the addition of new material.

Area 1: Top-Capping
Area 1& 2: Recaping
Area 1, 2& 3: Remoulding

  • Higher the speed the more rapid the tread wear particularly when cornering.
  • Fierce acceleration, hand braking
  • Mechanical irregularities
  • Incorrect pressure and incorrect wheel alignment
  • Abrasive road surface consisting of gravel and chipping
  • Hill area with winding road
  • Climatic conditions
  • On dry road in summer, treads can wear twice as fast as in winter or rain
  • The slower tread wear in winter or rain is influenced by the lower running temperature and lubricating effect of water between tyre and road
  • Tread or side wall seperation
  • Ply seperation
  • Cords, belt exposed for a large area due to excessive wear
  • Crown Break
  • Broken or Damaged bead wires
  • Two cuts which are close to each other
  • Injury is close to the bead area
  • Weakened condition due to age, heat, oil or solvent soaked
  • Reject unless the cracks on tread design grooves can be removed completely by buffing
  • Incorrect camber angle
  • Worn or loose wheel bearings
  • Excessive brushing wear
  • Worn tie-road ends
  • Broken springs
  • Wheel Bolt hole elongated
  • Ring Clamps or Studs loose
  • Misalignment
  • Out Of Round rims or wheels
  • Unbalanced wheels
  • Improperly Matched duals
  • Grabbing Brakes Brake Drums out of range
  • Badly Adjusted Brakes
  • Worn or Bent Steering Joints

X-rays

A special head scans the casing and in turn an image is produced on a screen similar to a television screen

Holography (laser photography)

Photographs are taken of the inside of the casing

Tyre exerciser

A machine, on which a casing is mounted, inflated and revolved at speed under load. This action produces heat, the casing temperature being raised high to indicate small separations due to expansion off air

Infra-red

A special sensor head detect small temperature irregularities in the flexing casing

Ultrasonic

High frequency sound waves are reflected by irregularities in a casing.