bike tyre pressure whats correct & how often tpms systems

tyre pressure affects tire wear and fuel economy

 

TIP: check the frame placard and/or the owners manual for the proper tire specifications and inflation pressures.

Conclusion: check inflate tyre pressure once a week or when you fill the fuel at pump. at least 15 days at once. before long rides. after kept long time. use manufcaure recommned chart which side of vehicle. Although tires lose a small amount of pressure over time under normal conditions (and due to temperature drops)

Tyre sidewall pressure chat vs motor cycle manufacure recommeded pressure chart

What about the inflation pressure information that’s marked on the sidewall of the tire?  This is the pressure necessary for the tire to carry its rated, maximum load.  The motorcycle manufacturer’s tire pressure specifications may be lower than, or the same as, the pressure indicated on the tire sidewall.

What’s the optimal tyre pressure of tyre?

Short Ans: Manfucature recommeded tyre pressre (they do lot tests & simulation for (bike dynamics  conditions), You can find these figures in the owner’s manual, but an easier solution is to look at the swingarm of the motorcycle, or the underseat storage of a scooter. There usually is a sticker that displays what the pressure should be.

motorcycle tyre load index chart

The load index is a numerical code that corresponds to a specific maximum load capacity for a tire, expressed in kilograms (or pounds). It helps riders determine how much weight (including the motorcycle itself, rider, passenger, and cargo) a tire can handle without compromising safety and performance.

ex: tvs raider tyre rear tyre speciciation for load index

front Tyre
80/100 – 17 Tubeless, 46P

Rear Tyre
100/90 – 17 Tubeless, 55P

Here 46 and 55 is the Load rating

55 Load inex

A load index of 55 corresponds to a weight of 218 kilograms

A load index of 46 corresponds to a weight of 170 kilograms

P is the speed index of 150Km/h safety

 

 

How manufacturers calculate tyre pressure for motorcycle?

Motorcycle manufacturers determine the ideal tire pressure for their models based on several factors:

Tire Specifications:

Load Index: This rating indicates the maximum load a tire can carry at a specified speed.
Speed Rating: This rating denotes the maximum speed a tire can safely handle.
Tire Construction: The type of materials used and the construction method influence the tire’s ability to withstand pressure.
Motorcycle Weight:The total weight of the motorcycle, including the rider and any cargo, affects the pressure required to support the vehicle.  
Riding Conditions:Terrain: Different road surfaces (e.g., asphalt, dirt, gravel) require varying levels of tire pressure for optimal traction and handling.

Weather Temperature Impact on tyre pressure

Tire pressure decreases by 1 PSI for every 10 degree drop in temperature.
: Factors like temperature and humidity can impact tire pressure.
Intended Use:Performance: Sports bikes or touring bikes may have different pressure recommendations based on their specific riding styles.
Off-Road: Tires for off-road use often require lower pressures for better traction.

Weight Distribution: The weight distribution of the motorcycle (between the front and rear wheels) influences tire pressure. A heavier front may require a different pressure than a heavier rear.

Rider and Load: The number of passengers and any additional cargo can significantly impact tire pressure needs. Manufacturers often provide pressure recommendations for different loads.

ex: Front 25PSI and rear 28PSI with pillion 32PSI (assuimg avg weight 70kg)

we may go up down by  2 not 10.
Manufacturer Testing:

Through extensive testing and simulations, manufacturers determine the optimal tire pressure for various riding scenarios.
The recommended tire pressure is typically found in the motorcycle’s owner’s manual or printed on a sticker on the bike’s frame or swingarm. It’s essential to follow these guidelines to ensure proper handling, safety, and tire longevity.

Note: Tire pressure can fluctuate due to temperature changes.

It’s recommended to check your tire pressure regularly, especially before long rides or in extreme weather conditions

Check Tire Pressure Regularly:

• Frequency: Check tire pressure at least once a week, or before every long ride.
• Cold Tire Pressure: Measure tire pressure when the tires are cold (haven’t been ridden for at least 3 hours).
• Inflation Gauge: Use an accurate tire pressure gauge to ensure precise measurements.

How much Air required to blow up tyre

DOn’t go above  manufacure recommended tyre pressures.  at petrols bunks they will pump ypour 40PSI for cars for bikes 35PSI for front (25PSI OEM recommended mostly) 40PSI for rear (32PSI for OEM with pillion rider)

try 50 PSI to blowup your tyre…  check youtube videos.. DIY.

How tpms works Tyre pressure monitoring system

A tire pressure monitoring system lets you know if your vehicle’s tires are significantly underinflated, with tire pressure that falls below 25% of the manufacturer’s recommended psi.

 

Bridgestone’s Guide for Proper Inflation of Motorcycle Tires

Tires intended for ordinary street/highway usage (“street tires”) do not perform the same as race tires. Operating motorcycles on tracks is an inherently dangerous activity. Always warm-up and properly inflate your tires before operating at high-speeds. Bridgestone’s Race Tire Operating Range Chart.

cold tyre pressure

Check pressure when your tires are “cold.”  A tire is considered “cold” if the motorcycle has been stationary for three hours or more.   if the bike was parked for at least three hours before travelling less than a mile at moderate speed, the tires are still considered cold.

 pressure is too low or too high?

too low can lead to internal structural damage of the tire. Pressure that is too high can allow for more external damage

Under-inflation causes excessive heat build-up due to excessive flexing of the tire,

Over-inflation makes it more likely for tires to be cut, punctured, or broken by sudden impact.

but too much and the centre section of the tread will wear prematurely.
overinflated tires are more prone to damage from road hazards such as potholes or debris

low pressure can lead to rapid wear of the tread shoulders, while too much pressure can lead to rapid wear of the center.

Lower pressures can make excessive wear of the edges of the tyre tread
decrease in fuel economy,
decreased traction on wet roads

Tire pressure affects a variety of factors such as fuel economy, tire wear, tire failure due to heat build-up, handling and steering response, traction on wet roads, and damage from road hazards.

air contracts when it’s cooled and expands when heated. For every 5.5°C reduction in outside temperature, tyres can lose up to 2% of their pressure.

The air pressure in a car tyre increases during driving. Reason: Temperature of air in the tyre increases due to friction of tyre with road.

 

Bike tyre componets

Motorcycle tires are composed of various materials and components that work together to provide traction, stability, and durability. Here are the key components of motorcycle tires:

1. Tread

• Description: The outer surface of the tire that makes contact with the road.
• Function: Provides traction and grip, channels water away to reduce hydroplaning, and enhances performance in different weather conditions. Tread patterns vary depending on the tire’s intended use (e.g., sport, touring, off-road).

2. Sidewall

• Description: The area of the tire that connects the tread to the bead and runs along the side of the tire.
• Function: Protects the internal structure of the tire, provides stability, and can influence ride comfort. The sidewall often contains important information, such as tire size, load index, and speed rating.

3. Bead

• Description: The inner edge of the tire that sits on the rim.
• Function: Ensures a secure fit between the tire and the wheel rim, preventing air from escaping. Beads are typically made of high-strength steel wires and are crucial for maintaining tire integrity.

4. Carcass

• Description: The internal structure of the tire made up of layers of fabric and steel belts.
• Function: Provides strength, flexibility, and support. The carcass can affect the tire’s handling characteristics, load capacity, and overall performance. The most common materials used for the carcass include nylon, polyester, or steel.

5. Ply

• Description: Layers of material (usually fabric or steel) that make up the tire carcass.
• Function: Adds strength and flexibility to the tire. Tires can have different ply ratings, indicating how many layers are used. Higher ply ratings typically mean increased load capacity.

6. Inner Liner

• Description: The layer of rubber inside the tire that helps contain air.
• Function: Acts as a barrier to prevent air leakage. In tubeless tires, the inner liner is crucial for maintaining pressure without the need for an inner tube.

7. Casing

• Description: The overall structure that includes the tread, sidewalls, and inner liner.
• Function: Supports the tire under load and contributes to ride quality, handling, and stability.

8. Steel Belts

• Description: Layers of steel belts that are often placed beneath the tread.
• Function: Provide additional strength and help prevent punctures while enhancing stability and handling.

9. Rubber Compound

• Description: The mixture of natural and synthetic rubber used in the tire.
• Function: Affects grip, durability, and wear resistance. Different compounds are used for different types of tires (e.g., softer compounds for sport tires for better grip, harder compounds for touring tires for longevity).

10. Shoulder

• Description: The part of the tire where the tread meets the sidewall.
• Function: Affects handling and cornering stability. The design of the shoulder can influence how the tire grips the road during turns.