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Bearing Grease & Fill

Stock bearings have 20-30% grease fill. This works great for bearings that continuously rotate and keeps drag down.

Extra Grease

Only do this on new bearings or bearings that have been completely cleaned out.

For more bearing life (but more drag) you can go to 50% fill. Flick out one seal, fill that side and replace the seal.  For BB and Hub you don't want more than 50% grease fill otherwise it creates extra drag and can pop the seals off in the cold.

For slow moving or highly loaded bearings (headset and suspension pivots) feel free to pack in as much grease as you can.  You can do both sides and get about 75% fill.

More fill does mean more drag and more mess (grease bleeds out the seals). But it does make bearings last. Thicker grease protects better but drags more.

For maximum speed and minimum bearing life, see what skaters used to do. Flick out the seals, blow out the grease and run a few drops of oil instead. Not recommended for MTB!

Grease Types

Thicker protects better but has more drag. Motorex Bike Grease 2000 is an excellent fully waterproof grease for greasing steel bearings. Slickoleum is a low viscosity suspension grease that works great in bearings for less drag. Avoid grease with particles (PTFE, Molybdenum etc) as these have lumps the balls need to climb over. Those greases are only for coarse sliding surfaces.

Bike Grease 2000Slickoleum