The Grand Cru fixed gear hub has high quality Japanese sealed bearings. The axle is chrome plated for durability and hollow to save a little weight. Proper track nuts are included. They are "fixed" threaded on both sides so you can use a cog and lock ring or a freewheel on either or both sides.
The hubs come spaced at 120mm
Spoke Flange Diameter: 62mm
Center to Flange Left: 30mm, Right: 30mm