Designed to fit common rear-hub sizes, the Simachine CNC Adapter with a 32T sprocket supports 1 inch (25mm) or 1.5 inch (38mm) rear hubs, making it compatible with many motorized bicycle builds. The kit includes a CNC adaptor, two CNC reducing gaskets, and a 32-tooth sprocket, putting essential hardware in one package for easier installation on 49cc–80cc two-stroke engines. The aluminum construction offers rigidity and corrosion resistance, helping maintain precise chain alignment under engine torque. Detailed dimensions are shown in the product photos to help verify fit before purchase.
Installation notes emphasize aligning the chain line precisely and using the included gaskets to ensure a tight seal against hub faces. This adapter is commonly paired with 415 chain setups and various sprockets, enabling riders to tailor gearing for climbing or flat-road performance. While installation is straightforward for experienced DIYers, beginners should consult the pictures and ensure compatibility with their specific hub diameter before attempting a mount.
| Product | Brand | Hub Size | Sprocket Teeth | Notes |
|---|---|---|---|---|
| Simachine CNC Adapter With 32T Sprocket | Simachine | 1″/1.5″ | 32T | Includes 1x CNC adaptor, 2x reducing gasket, 1x sprocket |
| DONSP1986 1.25 Inch Rear Hub CNC Adapter | DONSP1986 | 1.25″ | N/A | Fits spoke wheel bikes; includes screws |
| Simachine CNC Adapter With 40T Sprocket | Simachine | 1″/1.5″ | 40T | Includes 1x CNC adaptor, 2x gasket, 1x sprocket |
| JRL 36T Sprocket Adapter For 1.5 Hub | JRL | 1.5″ | 36T | 1x 36T sprocket, 1x CNC adaptor, 3 screws |
| KQTshangmao 35T Sprocket CNC Adapter | KQTshangmao | 1″/1.5″ | 35T | 1x adaptor, 2x gasket, 1x sprocket |
Simachine CNC Adapter With 32T Sprocket
Designed to fit common rear-hub sizes, the Simachine CNC Adapter with a 32T sprocket supports 1 inch (25mm) or 1.5 inch (38mm) rear hubs, making it compatible with many motorized bicycle builds. The kit includes a CNC adaptor, two CNC reducing gaskets, and a 32-tooth sprocket, putting essential hardware in one package for easier installation on 49cc–80cc two-stroke engines. The aluminum construction offers rigidity and corrosion resistance, helping maintain precise chain alignment under engine torque. Detailed dimensions are shown in the product photos to help verify fit before purchase.
Installation notes emphasize aligning the chain line precisely and using the included gaskets to ensure a tight seal against hub faces. This adapter is commonly paired with 415 chain setups and various sprockets, enabling riders to tailor gearing for climbing or flat-road performance. While installation is straightforward for experienced DIYers, beginners should consult the pictures and ensure compatibility with their specific hub diameter before attempting a mount.
DONSP1986 1.25 Inch Rear Hub CNC Adapter
Designed for rear-hub bikes with a 1.25 inch rear hub on spoke-wheel configurations, the DONSP1986 CNC adapter provides a precise, sturdy interface for 66cc–80cc two-stroke motors. The unit specifies compatibility with spoke-wheel frames and notes that it does not work with 9-hole or 6-hole sprockets. The kit includes two screws of 12.9 grade and three screws of 10.9 grade, supporting secure mounting on compatible hubs. This adapter focuses on dependable alignment and solid hardware to withstand engine torque during acceleration and hill climbs.
Users should verify hub diameter and sprocket compatibility against their existing wheel before purchase, and consult the included hardware list to ensure correct installation with their engine kit.
Simachine CNC Adapter With 40T Sprocket
This variant mirrors the 32T version but uses a 40T sprocket, offering a different gearing option for riders seeking a smoother climb or higher top speed with the same hub compatibility (1″/1.5″). The kit includes 1 x CNC Adaptor, 2 x CNC Reducing Gasket, and 1 x Sprocket. Like the 32T model, it is built to fit both 1 inch and 1.5 inch rear hubs and is suitable for 49cc–80cc two-stroke engines. Confirm hub diameter and chain compatibility using the included product photos before installation.
The adapter’s aluminum construction helps resist corrosion and wear, supporting a longer service life in variable riding conditions.
JRL 36T Sprocket Adapter For 1.5 Hub
JRL’s 36T sprocket adapter is designed for a 1.5 inch hub and 415 chain configurations, commonly used on motorized bikes built around 49cc–80cc engines. It works with a sprocket clamp installation kit featuring a 9-hole set to a spoke wheel bicycle. The package includes 1 x 36T multifunction sprocket, 1 x CNC Adapter, and 3 screws. This assembly supports robust mounting and improved chain alignment for reliable power transfer on compatible hub setups.
The 1.5 inch hub size and 36T sprocket provide a balanced gearing option that pairs well with moderate torque engines for everyday riding and occasional hills.
KQTshangmao 35T Sprocket CNC Adapter
KQTshangmao offers a 35T sprocket with a CNC adapter suitable for 1″ or 1.5″ rear hubs in 49cc–80cc motorized bicycles. The package includes 1 x CNC Adaptor, 2 x CNC Reducing Gasket, and 1 x Sprocket, delivering a compact option for riders seeking a middle-ground gearing choice between 32T and 40T. The product emphasizes brand-new quality and compatibility with a wide range of spoke-wheel bicycles. This kit provides a straightforward installation path with included hardware for quick upgrades.
Buying Guide
Fitment And Hub Size
- Hub sizes commonly supported: 1 inch (25mm), 1.25 inch, and 1.5 inch (38mm). Verify your rear hub diameter before purchase to ensure a correct match.
- Spoke-wheel compatibility matters: some adapters are not compatible with certain sprocket hole patterns (e.g., 9-hole or 6-hole configurations). Check the product notes and photos for exact compatibility.
- Many kits include reducing gaskets to bridge different hub faces; confirm gasket availability if your wheel requires a spacer.
Sprocket Teeth And Gear Ratios
- Teeth options like 32T, 35T, 36T, or 40T change torque vs. top speed. Choose based on your engine size (49cc–80cc) and terrain (hills vs. flats).
- Ensure the sprocket is designed for the chain standard on your bike (commonly 415 chain on these adapters).
- Some kits include the sprocket along with the CNC adapter, while others require separate purchases.
Material Quality And Durability
- Aerospace-grade aluminum or corrosion-resistant alloys are common for adapters and sprockets, balancing weight and strength.
- Higher hardness and protective coatings extend service life under engine torque and exposure to the elements.
- Weight considerations matter for riders optimizing power-to-weight with motorized setups.
Hardware, Installation Ease, And Compatibility
- Check what hardware is included: CNC adapters, reducing gaskets, and screws of various grades. Having all fasteners in one package simplifies installation.
- Look for clear dimensional references in product photos to verify fit before mounting.
- Some kits indicate compatibility only with spoke wheels; others may be suitable for a wider range of wheel types.
Maintenance, Warranty, And Support
- Examine the warranty terms and whether the seller offers support or replacement parts for worn components.
- Regular inspection of screws and gaskets helps prevent loosening and chain misalignment during use.
- Choose a kit with readily available replacement sprockets or hardware if service needs arise.