Answering the buyer’s search, these dropout adapters help convert or adapt rear derailleurs for single-speed or multi-speed setups while protecting frames. The top picks cater to riders seeking simple installation, reliable alignment, and compatibility with common derailleur brands. The list favors adapters that support single-speed conversions, through-axle or bolt-on frames, and easier maintenance for urban riders, commuters, and weekend trail riders. Below is a quick comparison of the five best options to consider, based on fit, ease of use, and build quality.
| Product | Best For | Key Benefit |
|---|---|---|
| KIEVODE Index Derailleur Hanger Plate | Most Shimano/SRAM setups without built-in hangers | Precise shifting restoration with included mounting screws |
| Forest Byke Company Derailleur Hanger Plate | Non-bolt-on rear derailleurs | Includes bolt and nut for secure mounting |
| Rear Disc Brake Adapter for Horizontal Dropouts | Frames upgrading to disc brakes | High-strength CNC aluminum and wide compatibility |
| Bike Rear Derailleur Hanger Thru Axle Dropout | Thru-axle frames | Designed for stable, durable thru-axle installation |
| Aluminium Alloy Rear Gear Mech Derailleur Hanger Hook | General use, multiple bike types | Protective, easy-install design with alignment guides |
Index Derailleur Hanger Plate for Shimano and SRAM
The hanger plate is designed for most Shimano and SRAM rear derailleurs that lack a built-in hanger. It supports conversion from single speed to multi-speed based on frame type and spacing. Best for riders seeking precise shifting restoration after hanger wear or damage. Installation is straightforward with included mounting screws, but ensure rear dropouts are aligned prior to mounting.
Index Bicycle Derailleur Hanger Plate with Nut and Bolt Adapter
Compatible with most Shimano and SRAM non-bolt-on rear derailleurs, this hanger includes a mounting screw bolt and nut for secure attachment. It’s suitable for riders who want a reliable replacement that fits a broad range of setups. Best for budget-conscious riders needing a quick, factory-like alignment without special tools.
Rear Disc Brake Adapter for Horizontal Dropout Frames
The disc brake mounting holder fits rear frames with horizontal dropouts, enabling a disc brake upgrade without replacing the entire frame. It’s ideal for MTB, road, fixed-gear, and custom builds seeking modern braking power. Constructed from high-strength CNC-machined aluminum for rigidity and durability. Best for riders upgrading stopping power while preserving frame geometry.
Bike Rear Derailleur Hanger Thru Axle Dropout Adapter
Designed for bikes with thru axles, this hanger ensures a perfect fit and stable performance. Made from CNC aluminum alloy for long-lasting durability and reliable protection for the frame. Easy installation by aligning the hanger and tightening screws. Best for riders with modern thru-axle frames seeking solid derailleur support.
Aluminium Alloy Rear Gear Mech Derailleur Hanger Hook
This hanger uses a premium aluminum alloy for strength while keeping weight manageable. It includes clear alignment guides for easy setup and aims to absorb impact to protect the frame dropout area. Best for riders performing their own maintenance and shops seeking efficient replacement parts.
Buying Guide
What matters most when choosing a single speed dropout adapter?
- Compatibility: Check whether the adapter fits your derailleur brand (Shimano, SRAM) and whether your frame uses bolt-on or non-bolt-on hangers, plus dropout type (horizontal, thru-axle).
- Installation: Look for kits with included mounting screws and clear alignment guides to minimize misalignment and shifting issues.
- Strength and durability: Aluminum or CNC-machined components offer rigidity and resistance to bending under braking or shifting loads.
- Shifting performance: A well-fitted hanger improves precise shifting and reduces chain rub or misalignment between gears.
- Upgrade goals: If upgrading to disc brakes or converting single-speed to multi-speed, ensure the adapter supports the conversion with appropriate spacing and mounting geometry.
Practical considerations
- For thru-axle frames, choose a hanger explicitly labeled for thru-axle compatibility to avoid loose fit.
- Non-bolt-on derailleurs require a hanger that clamps securely; ensure threads and nuts are included and compatible with your frame.
- Always verify rear dropout alignment before final tightening to prevent shifting problems and frame stress.
FAQ
- Do these hangers convert single-speed to multi-speed? Yes, some models support conversion depending on frame type and spacing.
- Can I install these myself? Most are designed for DIY installation with included screws and simple alignment steps.
- Are they compatible with all Shimano/SRAM derailleurs? Compatibility varies by model; check the product page for supported derailleurs.
- Is a disc brake adapter necessary for all upgrades? Only if you plan to upgrade to disc brakes on frames with horizontal dropouts.