Jon Forrest said:I'm learning how to overhaul bikes. Although I have
the usual books which tell me what to do, I'm curious
about the reasoning behind when to use grease or
when to use oil.
At first I was thinking that grease is for keeping
rust away from metal parts that touch but don't
move, and oil for places where things do move.
But, I'm not sure if this is correct.
What's the [censored]?
Generally, grease inside (bearing assemblies) or where torque is high (
crank bolts, seat binder bolt), oil on external moving parts (brake
pivots, spring ends).
Exceptions include oil inside multiple-gear hubs and grease for roller
brakes, but generally...
BTW both grease and oil are impermanent. Even if there's no
contamination, grease will degrade over 5-10 years as the volatile
components disappear. Today, a jeweler told me that modern watch
lubricants only last ten years*.
* For $150 he can 'overhaul' my $20 watch with Chinese Day. Takes about
6 weeks. I passed. They're $20 used in Hong Kong.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971