Frictional Loss of Bearing Lubricants & Bearing Sels

Summary


Seven lubricants of various viscosities were tested at low and high fill levels on three pairs of BB30 bottom bracket bearings to measure the frictional losses of each combination. In another series of experiments, bearing seals were removed from the BB30 bottom bracket bearings to measure the effects of bearing seals on frictional losses. A total of 45 different lube, bearing, fill, and seal combinations were tested. Data presented is per pair (set) of bearings.

 

 

Frictional losses (watts) of lubricants, bearings, and fill levels. Seals installed.



Frictional losses (watts), at two fill levels, of seals vs no seals.

Average Frictional Losses (watts) by lubricant and corresponding fill level per pair. Seals installed. Lower is better.


The most efficient lubricants, with the lowest average frictional losses are:


1. Ceramic Speed Time Trial Grease Fill Level – Low (25%) 0.13 watts/pair
2. Avid Slip R/C Bearing Racing Oil Fill Level – High (5 drops) 0.15 watts/pair
3. Avid Slip R/C Bearing Racing Oil Fill Level – Low (1 drops) 0.16 watts/pair


The least efficient lubricants, with the highest average frictional losses are:


1. Phil Wood Tenacious Oil Fill Level – High (5 drops) 0.79 watts/pair
2. Powdered MoS2 Fill Level – Light Dusting 0.58 watts/pair
3. Phil Wood Tenacious Oil Fill Level – Low (1 drop) 0.47 watts/pair

The difference in frictional losses between the most efficient lubricant and least efficient lubricant is 0.66 watts/pair.

 

 

 

Average Frictional Losses grouped by Lubricant. Seals Installed.

 

Frictional Losses of Seals Installed vs. Seals Removed. Grouped by Lubricant and Bearing.