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Crank Brothers
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Steel Synthesis Freehub Body

Current price: $47.99 Original price: $59.99
20% off
Color:One Color

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Steel Freehub Body adds durability for E-MTB builds

The Steel Synthesis Freehub Body swaps into a Synthesis rear hub for riders who put extra load through the drivetrain, particularly on E-MTB builds where added torque wears an alloy freehub faster. The steel construction trades a small weight penalty for meaningfully more durability under sustained high-torque riding.


Details

  • Freehub body swap built for high-torque drivetrain loads
  • Steel construction adds durability over alloy
  • Fits Synthesis, Cobalt, Iodine, and Zinc Twin Pair wheels
  • Includes matching end cap for straightforward installation
  • Item #CRNH051
Material
Steel
Compatibility
Crankbrothers 3-pawl base-model hubs (Gravel, XCT, Enduro wheels)
Includes
Freehub body, end cap
Claimed Weight
6.3oz (180g)
Activity
Cross-country, Enduro, Gravel
Manufacturer Part Number
[XD] 16503, [HG] 16507, [MS] 16508

Related Categories

  1. Bicycle Replacement Parts
  2. Road Wheel Small Parts
  3. Road Wheel Components
  4. Road Wheels
  5. Road Drivetrain Small Parts
  6. Gravel Drivetrain Small Parts
  7. Mountain Bike Drivetrain Small Parts
  8. Road Drivetrain
  9. Gravel and Cyclocross Drivetrain
  10. Mountain Bike Drivetrain

Frequently Asked Questions

  • Is the Crankbrothers Steel Synthesis Freehub Body suited to e-MTB use?
    Its steel construction is heavier and stronger than the alloy option, making it a durability-oriented choice for e-MTB torque. The body weighs 180 g.
  • Which Crankbrothers hubs fit the Steel Synthesis Freehub Body?
    It fits Crankbrothers 3-pawl base-model hubs, including compatible Synthesis, Cobalt, Iodine, Zinc Twin Pair, Gravel, XCT, and Enduro wheels. It is not for Ratchet or Industry Nine Hydra and 1/1 hub systems.
  • Which cassette standards are available for the Crankbrothers Synthesis Freehub Body?
    Choose the version matching your cassette: Shimano HG, Shimano Micro Spline, Shimano HG Road, SRAM XD, or SRAM XDR. The SRAM XDR version is limited to Gravel, XCT, and Enduro hubs.
  • What end-cap fitment does the Crankbrothers Steel Synthesis Freehub Body include?
    A matching end cap is included; a commonly listed Synthesis axle setup is 12 × 148 mm. Keep the correct spacer in place and handle the pawls carefully during installation.
  • What is the weight and material of Crankbrothers Synthesis Freehub Body SKU 16506?
    SKU 16506 is made of steel and weighs 180 g. That added weight favors wear resistance over minimizing wheel weight.