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Old 05-22-2010, 12:11 AM
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dag_29307 dag_29307 is offline
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Default Grease fitting?

I was just curious. What would happen if I were to drill and tap my hub cylinder and add a grease fitting? I mean this the one place on a bike that you want to make sure is greased what better way than to have a grease fitting? This could also apply to the crank tube and Goose-neck tube as well, providing that you block the other tubes. Could this be feasible?
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Old 05-22-2010, 03:16 PM
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bairdco bairdco is offline
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Default Re: Grease fitting?

older coaster brake hubs had an "oiler hole" and they work quite well. they're different than zerc fittings like cars use, as they were basicaly just a little capped off pipe in the hub. hubs like "new departure" and "komet" hubs had them, as well as many others.

they were mostly used for keeping the coaster brake shoes and worm gear lubed. it didn't help much for the main bearings, mostly because the grease would have to fill the entire hub before it'd squish out to the bearings, or it would have to break down enough to flow into them.

as for the bottom bracket and the headset, the same would apply. if you tapped a fitting into the frame, you'd have to pump the tubes so full of grease it would just be a big mess. then the grease in the bearings would break down, you'd pump it full again to push the old grease out, and it just sounds like a hassle.

it's easy enough to disassemble the headset, BB and hubs, and with repetition, you can learn to do it pretty quick.

i can overhaul a complete bike in 2-3 hours, and another bonus is, you can inspect all the parts as you clean them.
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Old 05-23-2010, 07:06 AM
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Default Re: Grease fitting?

Well stated. The only other thought I had was the lack of material for the NPT thread common on Zerk fittings. It's pretty much a given that a boss would need to be welded or brazed at the installation points in order to have sufficient thread engagement and avoid any interior interference.
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Old 05-23-2010, 01:05 PM
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Default Re: Grease fitting?

It's a conversion used on some "in the know" trail riders. They drill both the front and rear wheel hub and inject grease till it starts coming out the dust covers. I haven't dont it yet. I am going to. It adds a little weight but makes the wheel hubs so they never get any water in them again. As far as the neck goes probably not needed but it wouldn't take alot to do the crank hub either. The frame tubes could be blocked with expanding foam. Since there's not alot of pressure involved. I used foam to fill my seat post to stop moisture from going down the seat tube and getting in the crank bearings.
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