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How can I tell if my DA hubs have a sealed bearing and...(4 posts)

How can I tell if my DA hubs have a sealed bearing and...surf
Feb 20, 2002 5:04 PM
How can I tell if my DA hubs have a sealed bearing or need lubing. Obviously I have never packed bicycle bearings (or I wouldn't be asking). The hubs are older - 7 speed freewheel- and spin perfectly but since the bike was purchased used I thought it could use some good preventative maintenance. Also any tips for re-packing and lubes to use.

A side note, when I got the rear wheel re-dished, the mechanic said if the bearing aren't loose and spin good don't worry about them. That sounded kinda strange so I just thought I would see what you guys think
re: How can I tell if my DA hubs have a sealed bearing and...Rusty Coggs
Feb 20, 2002 5:54 PM
They have loose balls and cones, and a 'nominal' seal on the dustcap. They need periodic maintenance.
re: How can I tell if my DA hubs have a sealed bearing and...pa rider
Feb 21, 2002 3:57 AM
Hi surf,

I agree with rusty that their ball bearings. You should pack your bearing about twice a year if you ride alot (3000 miles then repack). If you do less then once a year, usually in winter.

If you do as the LBS, then you take your chances. If you don't check you wheel and the bearing are rough, guess what?
You pitted the hubs. Lets say the hubs were 9 speed dur-ace I wouldn't wait until they get gritty before repacking. Your hubs would last longer doing some PMS
(preventing maintance service not the other stuff).

Good hubs are worth keeping. I saw one guy said it was easier for him to buy new 105 wheels instead of getting the old hubs relaced, so I figure he may not cared if he pitted his hubs because he's just going to throw them out after a while.

I only do this with LX MTB hubs because they don't cost much and I wear a rim out a season.
Shimano uses cone/cup ballsCalvin Jones-Park Tool
Feb 21, 2002 5:42 AM
Shimano does not use a "cartridge bearing" system in their hubs. There are seals, and they are at least as effective as a cartridge bearings. Both use simple wiper systems.

The hub should get an overhaul to keep them running well. You should wipe out the freehub of dirt, rather than soak it with degrease, unless you want to pull the entire unit.

For hub overhaul, see http://www.parktool.com/repair_help/howfix_hub.shtml