This document discusses non-pneumatic or airless tires. It begins by introducing traditional tires which use air pressure inside a tube to support the vehicle's weight. It then defines non-pneumatic tires as those that do not use air pressure, instead using flexible spokes and treads that deform temporarily under weight before returning to their original shape. The document reviews several approaches to non-pneumatic tire design from NASA, Bridgestone, Michelin, and others. It notes advantages like resistance to flats and punctures but also disadvantages like lack of adjustability and potential for more vibrations compared to traditional air-filled tires. In conclusion, it suggests this new technology could increase safety and have environmental benefits.

1. Non Pneumatic Tyres
AIRLESS TYRES
Presenter:
Anindya Singh
Auto extremists

2. INTRODUCTION
• Tyre is a rubber member which gives the cushion to the
automobile. It consists of outer cover i.e. tyre proper and tube
inside.
• The tyre-tube assembly is mounted over the wheel rim and air
inside the tube carries entire load and provides cushion.

3. FUNCTIONS
• To support the vehicle load.
• To provide cushion against the shocks.
• To transmit driving and braking forces to the road.
• To provide grip for smooth steering.

4. TYPES OF TYRES
1. Tubed tyre
2. Tubeless
tyres

5. NON PNEUMATIC TYRES

6. WHAT IS AIRLESS TYRES?
• Airless Tyres or Non Pneumatic Tyres (NTP) are the tyres
which are not supported by air pressure.
Tread
Flexible Spokes

7. HOW IT WORKS?
The Flexible treads and the shear
band deforms temporarily as the
spokes bend, then quickly go back
to the initial shape.

8. DESIGN APPROACH
 NASA’s Apollo Lunar Rover
 Bridgestone Air-Free Tyre Concept

9. DESIGN APPROACH
 Michelin Tweel
 Resilient Technologies

10. DESIGN APPROACH
 Hankook I-Flex Tyres

11. ADVANTAGES
• No air leaks or tyre blow outs.
• Consistent economy and handling.
• No maintenance needed.
• Lengthened tread life.
• Facilitate recycling.
• Less environmental impact.
• Can take gunfire or explosion.
• Tread incorporated with water evacuation holes significantly reduce
hydroplaning.

12. DISADVANTAGES
• Lack of adjustability
• Not as economic as pneumatic tires
• Vibrations

13. CONCLUSION
• The wheel is probably the most important mechanical
invention of all time. The wheel has been continuously driving
our civilization like a catalyst in a chemical reaction.
• This new technology will increase the safety of cars as well
as have a positive impact environmentally.

14. THANK YOU! 

15. Anindya Singh