Tyre Fitment
Before selecting a tyre, you should know the size, type and use. You should first select the tyre type and size in accordance with the car manufacturer’s manual. Then, deciding the type of driving conditions for your tyre, you buy the tyre best suited for those conditions. If your matching up a tyre already on the car you should collect some information from it before selecting a tyre.
This Diagram explains what information you need.
Click on the Image to see a
full size version
Tyres user guidelines:
- Use tyres with the same size,type, construction, tread pattern and brand on your vehicle. If using a mix of tyres can not be avoided, you should get professional guidance
- Snow tyres should be put on all wheels during the winter season.
- Avoid using radial and bias tyres on the same vehicle.
- Avoid using tyres with different aspect ratios on the same vehicle. In case it is necessary, the lower aspect ratio tyres should be put on the rear axle.
Tube Selection
A general guide to selecting tubes is as follows:
- Make sure that tube size conforms to the tyre size.
- Make sure that a new tube is paired with a new tyre.
- Make sure that the tube has the same brand as the tyre.
- Choose a tube with a valve which matches with the tyre classification and rim type.
- Use a valve content that matches with the valve type. Do not forget to use the valve cap.
A Tube needs to be replaced when:
- Its circumference has inflated up to 92% or more of the tyre’s inside circumference.
- It has a broken valve.
- It has a flawed valve content which has to be immediately changed.
- It is worn-out, or if there is a soft part of the rubber surface.
B. SPEED GUIDELINES
1. It is advisable to know the tyre’s maximum permissible speed. As a general guideline please refer to the speed symbol table :
Passenger Cars
- Bias Tyres (Standard ) & (Snow)
Rim 12” maximum speed is 140 Km/H
Rim 13” and above maximum speed is 150 Km/H
- Radial Tyres (Standard) All Season
S speed rating maximum speed is 180 Km/H
H speed rating maximum speed is 210 Km/H
- Radial Tyres (Snow)
S speed rating maximum speed is 160 Km/H
2. The maximum recommended speed of a snow tyre is for normal winter road conditions, but not for icy roads.
Inch-up Principle
It is recommended in general that as long as the outside diameter remains the same, a 2 inch-up can be accepted. Please see the illustration below on how to inch-up your wheel.
| Size: |
175/70 R 13 |
185/60R14 |
195/50R 15 |
| OD (mm): |
575 |
577 |
576 |
| Section Width: |
176 |
184 |
196 |
