Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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In most cases it doesn't matter, but on some bottom brackets the right cup is affixed to the cartridge, so you're usually better off removing the left side first. It also makes sense to do the left first because it reliably has a right hand thread, whereas the right side, though usually left hand thread might be right hand if the BB is Italian or French thread.
It makes more of a difference with installation, where the right side goes to a shoulder to establish chainline, and the left as far as it goes, so going on it's almost always right first.
Squirting with WD-40 or penetrating oil should be deferred until you see if you need it. Give it a go as is, being sure to turn in the correct direction, then if it seems stuck you can use penetrating oil to help free it.
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