3R40 Internal 3-Speed Rear Hub – 28-Hole Bicycle Gear Drum

3R40 Inner Three-Speed Rear Hub with 28-Hole Handle Cover

Upgrade your bicycle's drivetrain with the 3R40 Inner Variable-Speed Rear Hub — a precision-engineered internal gear drum designed for smooth, reliable multi-speed cycling. Featuring a robust 28-hole lacing pattern and a durable handle cover, this flower drum hub integrates seamlessly into classic city bikes, commuter bikes, and cruisers that demand dependable internal gear shifting.

Key Features

• 3-Speed Internal Gearing: Smooth in-hub gear transitions keep your drivetrain clean and protected from the elements.
• 28-Hole Flange: Standard 28-hole spoke pattern ensures compatibility with a wide range of wheel builds.
• Inner Variable Speed Mechanism: Enclosed gear system for low-maintenance, all-weather performance.
• Rear Axle Shaft Design: Precision-machined rear shaft provides stable, centered wheel alignment.
• Handle Cover Included: Protective cover shields the hub mechanism and maintains a clean finish.
• Durable Construction: Built to withstand daily commuting and regular cycling demands.

Product Specifications

• Model: 3R40
• Speeds: 3-Speed Internal
• Hole Count: 28-Hole
• Type: Internal Gear Rear Hub (Flower Drum)
• Position: Rear
• Includes: Handle Cover
• Made in: Mainland China

Perfect For

• City and commuter bicycle builds or rebuilds
• Replacing worn or damaged internal gear hubs
• Traditional cruiser and urban bike restorations
• Cyclists who prefer a clean, chain-guard-compatible drivetrain

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External Resource

For general bicycle safety standards and maintenance guidance, visit the U.S. Consumer Product Safety Commission – Bicycle Safety Guide.

Learn more: Bicycle wheel

Frequently Asked Questions

Q: What type of bicycle is the 3R40 internal gear rear hub compatible with?

A: The 3R40 three-speed internal gear rear hub is compatible with most standard city, commuter, and cruiser bicycles that use a 28-hole rear wheel lacing pattern. Always verify your frame's dropout spacing and axle dimensions before purchasing.

Q: What are the advantages of an internal gear hub over a traditional derailleur system?

A: Internal gear hubs like the 3R40 enclose all moving gear components within the hub shell, protecting them from dirt, moisture, and debris. This results in lower maintenance requirements, reliable all-weather shifting, and compatibility with full chain guards for a cleaner bike setup.

Q: Does this hub come with all necessary hardware for installation?

A: The 3R40 rear hub includes the handle cover as specified. It is recommended to consult a local bike mechanic or refer to your bicycle's manual for spoke length requirements and any additional hardware needed for wheel building or installation.

Q: What does "28-hole" mean for a bicycle hub?

A: The "28-hole" specification refers to the number of spoke holes on the hub flange. This determines how many spokes the wheel will use, and it must match your rim's hole count. 28-hole is a common standard for lightweight city and commuter builds.