RL II series rear MTB hubs offer premier performance for Off Road use at an entry level price.Sealed cartridge bearings and wide flange spacing are standard for the RL series.Using a hi-strength Cr-Mo steel tube main axle ensures these hubs are reliable.The RL II Freehub drive system features 4 independently sprung pawls for added security.We also feature Cr-Mo freehub bodies to resist âÂÂcassette cog biteâ and ensure durability.Freehubs are available in classic Shimano HG spline type or Shimano Micro-Spline formats with SRAM XD Freehubs available as an aftermarket option.RL II rear hubs are available in Standard 142mm spacing or 148mm Boost format for use on 12mm thru axle frames.Optional aftermarket endcaps enable the HG version hubs to also fit with QR format frames.(Note: The Microspline Freehub type requires a specific end cap, and is only available to fit on 12mm Thru-axle systems)