Coaster Brake Hub - What's Inside? How Does It Work? Cutaway View!

TL;DR

Learn how a coaster brake hub functions and transitions between pedaling forward, coasting, and braking.

Transcript

Hey Veiwers! Have you ever wondered what's inside a coaster brake hub and how they work? first if you're not familiar with what a coaster brake hub is if you pedal forward you go forward you can stop and it coasts and to brake you just paddle backwards and that engages the brakes inside the hub They're generally pretty easy to identify because they... Read More

Key Insights

• 🚴 Coaster brake hubs are easy to identify, with a brake arm attached to the chainstay. They are usually single speed but can also have an internally geared hub.
• 🛠️ The coaster brake mechanism consists of a driver, clutch, expander, and brake shoes. When pedaling forward, the clutch engages with the hub shell to turn the wheel. When coasting or backpedaling, the clutch disengages.
• 🔧 Different brands of coaster brakes may have slightly different clutch mechanisms, but the basic concepts remain the same. All coaster brakes will have brake shoes, expanders, clutches, and drivers.
• 🔄 The clutch and expander unit have teeth that mesh together to engage and disengage the clutch with the expander. A retarder spring helps control the movement of the clutch.
• 🔩 The clutch is threaded to match the driver unit, allowing it to be pushed or pulled by the driver as it turns.
• 🔒 When in brake mode, the clutch engages with the expander, pushing the brake shoes against the inside of the hub shell, creating friction and braking action.
• 🔍 A closer view of the clutch and expander unit reveals the teeth and how they mesh together, as well as the function of the retarder spring.
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Summary & Key Takeaways

• A coaster brake hub has three modes: pedaling forward, coasting, and back pedaling to engage the brake.

• The hub consists of a driver, clutch, expander, and brake shoes that interact to control the movement of the hub.

• When pedaling forward, the clutch engages with the hub shell, allowing the wheel to turn, while back pedaling pushes the brake pads against the inside of the hub, creating braking force.