Convert Single Speed To Internal Gear Hub

Converting Your Single-Speed Bike to an Internal Gear Hub: A Comprehensive Guide

Are you tired of the limitations of your single-speed bike? Do you crave the versatility of gears without the complexities of derailleur systems? Converting your single-speed to an internal gear hub (IGH) might be the perfect solution. This guide will walk you through the process, outlining the considerations, components, and steps involved in this exciting upgrade. It's a more involved project than a simple component swap, but the results are worth the effort for increased versatility and reduced maintenance.

Understanding the Benefits of an Internal Gear Hub

Before diving into the conversion process, let's highlight why an IGH is a worthwhile upgrade. IGHs offer several key advantages over traditional derailleur systems:

• Simplified Maintenance: Internal gears are encased within the hub, protecting them from the elements and reducing the need for frequent cleaning and adjustments. This translates to less downtime and hassle.
• Increased Durability: With fewer moving parts exposed to the environment, IGHs are generally more durable and less prone to damage from mud, water, or impacts.
• Clean Aesthetics: The absence of external derailleurs and cables contributes to a cleaner, more streamlined look for your bike.
• Versatility: IGHs offer a range of gears, allowing you to tackle varied terrains with ease, from steep hills to flat roads.
• Enhanced Security: The enclosed design makes IGHs less susceptible to theft or damage compared to external derailleurs.

Assessing Your Bike's Compatibility

Not all single-speed bikes are suitable for an IGH conversion. Before you begin, consider these crucial factors:

• Frame Clearance: The most important factor. Your frame needs sufficient clearance for the larger diameter of the IGH. Measure the existing rear hub width and compare it to the dimensions of the IGH you plan to use. You'll also need to check for clearance around the chainstays and seat stays.
• Dropout Spacing: The spacing between your rear dropouts must match the IGH's spacing. Common spacing includes 130mm, 135mm, and 142mm. You might need to adjust or replace your dropouts if they don't match.
• Chainline: Your chainline (the alignment of the chain relative to the bottom bracket) needs to be compatible with the new IGH. This might require a new bottom bracket or crankset.
• Wheel Size: Ensure that the IGH you choose is compatible with your wheel size (26", 700c, etc.).

Choosing the Right Internal Gear Hub

Several reputable manufacturers produce high-quality IGHs, including Shimano Alfine, Rohloff, and SRAM Automatix. Your choice will depend on your budget and desired gear range. Consider factors like:

• Gear Range: How many gears do you need? Options range from 3 to 14 gears.
• Durability: Some IGHs are known for their robust construction and longevity.
• Maintenance: While all IGHs require less maintenance than derailleurs, some are easier to service than others.
• Cost: Prices vary significantly depending on the brand and number of gears.

The Conversion Process: A Step-by-Step Guide

This is a simplified overview; consult a professional bike mechanic if you lack experience with bike repairs.

1. Remove the existing wheel and single-speed hub.
2. Install the new IGH wheel. This often requires adjusting brake calipers and potentially changing brake levers if using rim brakes.
3. Adjust the chainline. This may require a new bottom bracket or crankset, depending on your frame and the IGH.
4. Install the appropriate chain. The chain length needs to be precise for optimal performance.
5. Adjust the gears. This step involves correctly indexing the gears for smooth shifting.
6. Test ride and fine-tune. After the installation, test the bike thoroughly, making adjustments as necessary to ensure smooth shifting and efficient performance.

Beyond the Basics: Additional Considerations

• Cable Routing: Proper cable routing is crucial for smooth gear changes.
• Shifter Compatibility: You'll need a shifter compatible with your chosen IGH.
• Specialized Tools: Some tools, such as a hub cone wrench, may be necessary for the installation.

Converting your single-speed to an internal gear hub is a rewarding project that significantly enhances your bike's functionality and durability. While the process requires careful planning and attention to detail, the result is a versatile and low-maintenance ride that's ready for anything. Remember to prioritize safety and consult a professional if you're unsure about any step of the conversion.