Removing rear bicycle wheel hub gears requires careful disassembly of the wheel, axle, and gear mechanism using specific tools and step-by-step precision.
Understanding Rear Bicycle Wheel Hub Gears
Rear bicycle wheel hub gears are compact internal gear systems housed within the rear wheel hub. Unlike traditional external derailleurs, these gears provide smooth shifting without exposing the chain to environmental elements. Internal hub gears are popular among commuters and touring cyclists because they require less maintenance and offer reliable performance in various weather conditions.
The mechanism consists of planetary gear sets inside the hub shell, which alter gear ratios by engaging different gear trains. This design keeps the drivetrain cleaner and quieter. However, servicing or replacing these gears demands a clear grasp of their construction and careful handling during removal.
Tools Required for Removing Rear Bicycle Wheel Hub Gears
Before attempting to remove rear bicycle wheel hub gears, assembling the right tools is crucial. The process involves dealing with axle nuts, lockrings, sprockets, and sometimes bearings. The following tools are typically necessary:
- Cone wrenches: Thin wrenches designed to fit narrow flats on cones.
- Lockring spanner: For removing lockrings securing sprockets or gear mechanisms.
- Chain whip: Holds the sprocket steady during loosening.
- Adjustable wrench or open-end wrench: For axle nuts.
- Screwdrivers: Flathead or Phillips for small screws on some hubs.
- Pliers: Needle nose or regular for cable removal.
- Grease and cleaning supplies: For maintenance after removal.
Having these tools ready ensures a smooth workflow without frustrating interruptions.
The Step-by-Step Process: How To Remove Rear Bicycle Wheel Hub Gears
Removing rear bicycle wheel hub gears is a meticulous task that demands patience and precision. Follow this detailed stepwise approach:
Step 1: Prepare Your Workspace and Tools
Set up your bike on a stable stand or flip it upside down for easy access to the rear wheel. Clear your workspace to prevent losing small parts. Gather all necessary tools within reach.
Step 2: Release the Gear Cable
Locate the gear cable connected to the hub’s shifting mechanism. Use pliers or a screwdriver to loosen the anchor bolt holding the cable in place. Once loose, carefully pull out the cable from its housing to free tension.
Step 3: Remove Rear Wheel from Frame
Loosen the axle nuts using an adjustable wrench or cone wrenches if applicable. If your bike has quick-release skewers, open them accordingly. Slide the wheel out gently from dropouts while supporting it securely.
Step 4: Detach Sprocket and Lockring
The sprocket is secured by a lockring that requires a lockring spanner and chain whip for removal:
- Place the chain whip on the sprocket to hold it steady.
- Fit the lockring spanner onto the lockring’s notches.
- Turn counterclockwise carefully to unscrew the lockring.
- Once loose, remove both lockring and sprocket from the hub shell.
This exposes part of the internal gear assembly.
Step 5: Remove Axle Nuts and Cones
Using cone wrenches, loosen axle nuts on both sides of the axle carefully while holding cones in place with another wrench. Unscrew nuts fully and slide them off along with washers.
Step 6: Extract Axle from Hub Shell
With all securing parts removed, gently pull out the axle from one side of the hub shell. Be mindful of small ball bearings that may fall out; collect them promptly if exposed.
Step 7: Access Internal Gear Mechanism
Inside you’ll find planetary gear sets or cam plates depending on your hub model (e.g., Shimano Nexus, Sturmey-Archer). Carefully inspect how components fit together before proceeding further disassembly.
The Importance of Proper Handling During Removal
Internal hub gears contain delicate components like pawls, springs, bearings, and seals that require cautious handling. Mishandling can lead to damage or misalignment affecting future performance.
Keep parts organized in trays or labeled containers during disassembly to avoid confusion during reassembly. Avoid forcing components apart; if resistance occurs, double-check for hidden fasteners or clips.
Troubleshooting Common Issues While Removing Hub Gears
Sometimes removal doesn’t go as planned due to rusted parts, stripped threads, or stuck bearings:
- Rusty Lockrings: Apply penetrating oil several hours before attempting removal to loosen corrosion.
- Difficult Axle Removal: Tap gently with a rubber mallet if stuck but avoid excessive force that could deform parts.
- Cable Housing Stuck: Use lubricant spray inside housing before pulling cables free.
- Bearing Loss: Use magnetic trays or work over a cloth surface to prevent losing tiny balls.
Patience pays off in overcoming these obstacles safely.
A Comparison Table of Popular Internal Gear Hubs
| Hub Model | # of Speeds | Main Features |
|---|---|---|
| Shimano Nexus SG-7R36 | 7-Speed | Smooth shifting; integrated coaster brake option; reliable urban use |
| Sturmey-Archer AW Series | 3-Speed | Simplistic design; robust; classic touring choice; easy maintenance |
| SRAM Automatix 2-Speed | 2-Speed | No shifter needed; automatic shifting based on speed; low maintenance |
| BROSE Internal Gear Hub (Custom builds) | Varies (up to 14) | E-bike compatible; high efficiency; advanced gearing options available |
This table highlights diverse options reflecting different complexities when removing hubs depending on model specifics.
Lubrication and Maintenance Post-Removal
After removal comes an excellent chance for deep cleaning and lubrication. Clean all parts thoroughly with degreaser followed by drying them properly before applying fresh grease especially on bearings and moving parts inside gears.
Lubrication reduces friction wear inside planetary sets ensuring longevity and smooth operation once reassembled. Avoid over-greasing as excess grease can attract dirt causing premature wear.
The Reassembly Process Brief Overview
Reassembling rear bicycle wheel hub gears reverses removal steps but requires special attention:
- Insert axle carefully ensuring ball bearings seat correctly in races without falling out.
- Tighten cones just enough for smooth rotation without play—too tight causes binding.
- Replace sprocket and lockring securely using chain whip again to prevent loosening under load.
Proper adjustment guarantees optimal shifting performance after putting everything back together.
Key Takeaways: How To Remove Rear Bicycle Wheel Hub Gears
➤ Prepare your workspace: Clean and organize tools beforehand.
➤ Release chain tension: Shift to the smallest gear to ease removal.
➤ Remove wheel carefully: Disconnect brakes and axle nuts gently.
➤ Disassemble hub components: Use correct tools to avoid damage.
➤ Inspect parts thoroughly: Check for wear or needed replacements.
Frequently Asked Questions
What tools are essential for removing rear bicycle wheel hub gears?
Removing rear bicycle wheel hub gears requires specific tools such as cone wrenches, a lockring spanner, chain whip, adjustable wrench, screwdrivers, and pliers. Having these tools ready ensures the removal process goes smoothly without interruptions.
How do I safely remove the rear bicycle wheel hub gears?
Start by preparing your workspace and gathering tools. Release the gear cable tension using pliers or a screwdriver, then carefully remove the rear wheel from the frame. Handle all parts gently to avoid damage to the internal gear mechanism.
Why is it important to release the gear cable before removing rear bicycle wheel hub gears?
Releasing the gear cable frees tension on the shifting mechanism inside the hub. This step prevents damage to cables or internal components during removal and allows easier disassembly of the gear system.
Can I remove rear bicycle wheel hub gears without special knowledge?
Removing these gears requires understanding their internal construction and careful handling. Without proper knowledge and tools, you risk damaging delicate components. It is recommended to follow detailed instructions or consult a professional if unsure.
What maintenance should be done after removing rear bicycle wheel hub gears?
After removal, clean all parts thoroughly and inspect for wear or damage. Apply fresh grease to bearings and moving parts before reassembling to ensure smooth operation and prolong the lifespan of your hub gears.