Crank LubricationGrease Fitting
for a Bicycle Crank
"Adding a Grease Fitting
to a Bicycle Crank
For lubrication of two sets of crank bearings without disassembly."
You probably didn't know, besides the chain,
that there were other areas that need greasing
on a regular basis on your bicycle.
- grease fitting, drill bit, drill, wrench or small socket
- small bolt with same thread as grease fitting
- grease gun
Flip a bicycle over, seat down, pedals up.
Drill a small hole, slightly smaller than the grease nipple thread. Keep the drill hole away from left side 3/4" (2 cm) so as not to drill into the bearings.
Screw a bolt into the hole that has the same thread as the grease nipple. Work around good and remove.
Screw in the grease fitting using downward pressure. Get grease gun and pump about 20 pumps worth of car bearing grease into empty crank shaft area.
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It was my first industrial design. It was manufactured that same year.