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Crankset -- Is this normal?

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Crankset -- Is this normal?

Old 01-11-19, 10:34 AM
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MidTNBrad
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Crankset -- Is this normal?

The other day I removed the crankset out of my bike for the first time in a couple of years and I found it to be practically fused to the bottom bracket. It took several hard whacks of a rubber mallet to get it to even budge, but I finally got it out. After cleaning it up I noticed what looks like corrosion on the spindle where it interfaces with the bearings. Is this normal? Should I just grease it up when I reinstall it? For reference the bike is a Cervelo R3 with a Rotor 3D+ crankset and a BBInfinite bottom bracket.
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Old 01-11-19, 11:13 AM
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TiHabanero
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Yep, see it all the time. Grease it every service cycle to avoid this in the future.
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Old 01-11-19, 11:55 AM
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Yes, common when assembled without sufficient lube on axle. Water gets trapped between bearing and axle then corrodes. Remember that most corrosion produces a compound (the oxide) that takes up more volume then the base elements did. So corrosion can cause a slip fit to become an interference fit. (Independent on the galvanic "welding" aspects). Andy
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Old 01-11-19, 11:55 AM
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Yea, bearing races are steel which rusts .. as said above grease is what you apply.. steel and aluminum can seize together ..
mutual corrosion

Thousands of threads of seat posts & stems, of aluminum doing that in steel frames & forks
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Old 01-11-19, 12:21 PM
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MidTNBrad
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Thanks everyone. I'll be generous with the grease when I put it back in.
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Old 01-12-19, 08:33 PM
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Get a wire brush about the same size as a toothbrush. Clean that brown stuff off with mineral spirits or diesel fuel. I like using dilectric grease or aluminum anti-seize grease for re-assembly.
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