Timeline for How does pedaling power transfer to the bearings in Hollowtech II bottom bracket?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| May 20, 2015 at 7:05 | comment | added | super | As he said correctly, the friction between the spindle and the BB is always much superior to the friction on the bearings. The reason why these are plastic, is because this material is neutral. On metal-to-metal contact you always have the big problem of rusting, which in some cases can chemically bond the two pieces making it a huge pain to separate. This is why every time you have metal to metal contact ( crank and pedals, BB and frame), you should throw as much grease as you can before attachment, and do this every once in a while (say, every year). | |
| May 12, 2015 at 21:40 | comment | added | paparazzo | That plastic is to keep the crank arm off the metal of the bottom bracket. And you don't know that plastic does stay still. | |
| May 12, 2015 at 21:32 | comment | added | terpsichorean | So if all we want is for the crank spindle to spin with low friction, why is there a plastic tube around it (between the two bearings)? Wouldn't the plastic tube contribute friction if it stays still while the crank spindle spins inside of it? | |
| May 12, 2015 at 21:05 | history | answered | Nik | CC BY-SA 3.0 |