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Alloy Synthesis Freehub Body + End Cap
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Alloy Synthesis Freehub Body updates hub compatibility
The Alloy Synthesis Freehub Body swaps into a Synthesis, Cobalt, Iodine, or Zinc Twin Pair rear hub to change cassette compatibility without replacing the hub or wheel. The alloy body keeps the swap light while still standing up to Gravel, cross-country, and enduro riding.
Details
- Freehub body swap for changing cassette compatibility on a Synthesis hub
- Alloy construction keeps the swap lightweight
- Compatible with Synthesis, Cobalt, Iodine, and Zinc Twin Pair wheels
- Includes matching end cap for straightforward installation
- Item #CRNH04X
- Material
- Alloy
- Compatibility
- Crankbrothers 3-pawl base-model hubs (Gravel, XCT, Enduro wheels)
- Includes
- Freehub body, end cap
- Claimed Weight
- 4.4oz (125g)
- Activity
- Cross-country, Enduro, Gravel
- Manufacturer Part Number
- [XD] 16504, [HG] 16505, [MS] 16506
Related Categories
Frequently Asked Questions
Which Crankbrothers wheels fit the Alloy Synthesis freehub body?
It fits compatible Crankbrothers Synthesis, Cobalt, Iodine, and Zinc Twin Pair wheels with 3-pawl base-model hubs, including Gravel, XCT, and Enduro hubs.How do I choose the right driver for the Crankbrothers Alloy Synthesis freehub body?
Match the driver to your cassette: HG uses Hyperglide splines, Micro Spline fits compatible Shimano 12-speed MTB cassettes, XD fits SRAM XD cassettes, and XDR fits SRAM XDR road or gravel cassettes. Driver availability depends on the hub configuration.What does the Crankbrothers Alloy Synthesis freehub body weigh, and what is included?
The alloy freehub body has a claimed weight of 4.4 oz (125 g) and comes with a matching end cap.Which part number matches the XD, HG, and Micro Spline versions?
The listed part numbers are XD 16504, HG 16505, and Micro Spline 16506. XDR is also listed as an available size option.What should I consider when installing this Crankbrothers freehub body?
Match it to a compatible 3-pawl base-model hub and its driver configuration, then follow the Crankbrothers hub-service procedure. Keep the freehub clean and lubricated with manufacturer-approved hub grease.









