HG (Hyper-Glide)
- HG, short for ‘HyperGlide’, is the most common and traditional freehub body design available. Created by Shimano, it is the standard used for cassettes that have at least an 11-tooth cog as the smallest cog on the cassette. HG Specific cassettes are available in 8,9,10, and 11speed options. Most drivetrain manufacturers have cassettes designed for the HG format, including Shimano and SRAM.
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SRAM XDR
- XDR (“R” is for Road) is the road version of the XD freehub body. It looks similar in appearance to the XD freehub body, but is machined 1.85mm deeper where the cassette threads onto the freehub. This is in an effort to match the flange spacing for road hubs, so a re-dish is not required. Similar to the XD design, XDR allows for less than a 11-tooth cog, for a wider gear range on the cassette. While XDR is road specific, a 1.85mm spacer (Supplied by SRAM) can be used on the XDR freehub body to accommodate XD cassettes. XDR driver bodies will fit 11 and 12 speed drivetrains with XDR specific cassettes.
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Campagnolo or ‘Campy’
- The Italian’s answer to freehub design is one of the more radical in appearance. Similar to HG – it utilizes splines to hold cassettes that have at least an 11-tooth cog as the smallest gear on the cassette. Campy freehub bodies are sometimes referred to as “CA”, and will fit 8, 9, 10, 11, and 12 speed Campy/CA specific cassettes.
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