1. Design: Decathlon Spinning Bike 03 adopts simple and classic design, with simple and elegant appearance, which is suitable for various indoor environments, while Decathlon Spinning Bike 04 adopts more fashionable and modern design, with more attractive appearance, which is suitable for gymnasiums and other places for young people.

2. Adjustment system: Decathlon Spinning Bike 03 is equipped with a basic seat and handlebar height adjustment system, which can be adjusted according to individual needs to provide a comfortable riding experience, while Decathlon Spinning Bike 04 is equipped with a more comprehensive seat and handlebar height adjustment system, which can be adjusted according to individual needs to make users ride more comfortably.