My takeaway from reading many threads here and on other forums is that the differences between cranks that spin 2 times and cranks that seemingly spin forever is fractions of a Watt...virtually unnoticeable in actual riding conditions, and that spinning in this unloaded condition is not indicative of its performance under load. The spin is very smooth, it just doesn't spin very long.
Help me out. Allay my fears. Or tell me that this is not good and that I should go spend $150 on a ceramic BB.
a bearing shipped with less and/or lighter grease, or even oil, will have less drag, but it may also be more vulnerable to wear/damage as lubricant is lost and water/dirt enters
aside from that, better seals are likely to cause more drag, a bb that spins freely today may get contaminated far sooner
exactly the same applies to ceramic bearings, if a new ceramic bb is free spinning, it is not because of ceramic magic
Think of it this way. Even though your crankset doesn't spin forever, you could move it along with your pinkie finger with no effort. It just doesn't require meaningful wattage to move a crankset against the drag of the new grease and bearing seals.
Like sungod said I believe it's due to fresh grease in the bearing and the resistance will get close to none in few hundreds of km. Finger's crossed..
You'll have that drag for the first few hours use. Then it'll spin freely for a period of time, which depends on you (how you ride, clean, look after your bike) then they'll start to wobble and need replacing.
I've got HTII bottom brackets which have been used, abused and ignored for 6-7-8 years which still work well.
Foul bearing drag though, scale with the load. Good quality steel bearing maybe better than cheap ceramic bearing here they keep being in good condition with high impact force better. They stay rounder and less rigid/fragile so it doesn't chip the race and doesn't crack itself.
Ceramic bearing doesn't rust, so light oil or very thin grease can be use. Seal can also not very tight. They make crank spin forever on stand with all load come from seal and grease drag (which is already small from the beginning).
But steel bearing with proper grease and seal will stay smoother in the long run.
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