Kiến thức Cơ bản về EV

What Affects EV Tire Rolling Resistance?

Why rolling resistance matters for an EV

As a tire rolls, its rubber and structural components continually deform as they enter and leave the road contact patch. Some energy is dissipated as heat rather than being used to move the vehicle forward.

For an electric vehicle, reducing this energy loss is particularly important because tire rolling resistance can influence overall vehicle energy consumption and therefore driving range.

However, an EV tire cannot be engineered for low rolling resistance alone. It must balance efficiency with other requirements including:

• wet and dry grip; 
• braking and handling; 
• load-carrying capability; 
• durability and tread wear; and 
• ride comfort and noise. 

How Giti engineers lower rolling resistance

Giti develops low rolling resistance technology through a combination of tire architecture, materials engineering and simulation.

Giti's low rolling resistance technologies include advanced compound formulations using silica and polymers to reduce energy loss while maintaining important characteristics such as wet grip, durability and heat resistance. Tire architecture and structural optimisation are also used to reduce deformation and energy dissipation. 

Giti EV Engineering in Action: BMW iX1 and iX2

A strong example is the GitiSynergy H3 developed for the all-electric BMW iX1 and BMW iX2.

The OE-approved tire achieves the highest EU Rolling Resistance label rating of A while being engineered to meet BMW Group requirements for handling, noise, wear life and sustainability. 

Key takeaway:

EV tire efficiency is not simply about making a tire roll more easily. The engineering challenge is reducing energy loss while retaining the grip, durability, load capability and handling required by the vehicle.

Suggested internal links:
Giti Low Rolling Resistance Technology → Giti EV Technologies → BMW iX1/iX2 OE Case Study