I. Core Difference Dimensions

1. Different Transmission Methods

Mechanical disc brakes: Transmit braking force through steel cables. The operating force of the brake lever is directly transmitted to the brake pads via the steel cables, driving the pads to clamp the brake disc. Structurally, they rely on the tension of the steel cables, and the tightness of the cables directly affects the braking response.

Hydraulic brakes (oil brakes): Use hydraulic oil as the transmission medium. The brake lever has a built-in oil cylinder; when the lever is pressed, it pushes the hydraulic oil to flow along the oil pipe, driving the piston in the caliper to squeeze the brake pads to achieve braking. The transmission process relies on the incompressibility of hydraulic oil and does not require steel cable tension.

2. Differences in Braking Performance

Mechanical disc brakes: The braking force is relatively limited, and it requires a large operating force on the lever. Long-term riding and braking may cause hand fatigue; the braking response speed is medium. Affected by steel cable wear and rust, the braking stability may decrease after long-term use.

Hydraulic brakes (oil brakes): Have strong braking force and excellent linearity. A light press on the lever can obtain sufficient braking force, which is labor-saving and not easy to cause hand fatigue during long-term riding; the braking response is fast and accurate. Hydraulic transmission is less affected by the environment, and the braking stability is stronger, making it especially suitable for complex riding scenarios such as high-speed riding and long downhill sections.

3. Environmental Adaptability

Mechanical disc brakes: Steel cables are easily eroded by rainwater and dust, resulting in rust and jamming, which affects braking effect; in low-temperature environments, the flexibility of steel cables decreases, which may lead to braking delay.

Hydraulic brakes (oil brakes): Hydraulic oil is not easily affected by rainwater and dust. The oil pipe has good sealing performance and strong anti-pollution ability; the performance is stable in low-temperature environments, and the braking effect is less disturbed by environmental factors, with wider adaptability.

II. Summary of Applicable Scenarios

Mechanical disc brakes: Suitable for light-use scenarios such as commuting and casual riding, as well as users with limited budgets who pursue simple maintenance.

Hydraulic brakes (oil brakes): Suitable for scenarios with high requirements for braking performance such as mountain biking, high-speed riding, and long-distance riding, as well as users who pursue riding experience and are willing to bear higher maintenance costs.