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how do I replace helium bearings?(3 posts)

how do I replace helium bearings?Hectolyte
Jun 19, 2001 6:19 PM
I figure it's probably cheaper if I do it than if I bring it to a bike shop, so could somebody please tell me exactly the tools I use, the parts I need, and what I have to do. Thanks.
I doubt it's cheaper, but maybe...TJeanloz
Jun 20, 2001 11:39 AM
I don't know if you want to replace the front, rear or both bearings, but here's the deal. You've got to unscrew the cap on the non-drive side of the axel, after you've done that, the axel should fall out the drive side. That will expose two sealed bearings in the front, (three in the rear). You'll need a sealed bearing puller to pop the bearings out. You will then need to replace those bearings with Mavic replacements, which are not typically a standard size, so you have to buy them from a Mavic dealer. Be warned; it could take months to get them from Mavic. Those bearings need to be carefully tapped back in, preferably using a length of pipe or some other tool to avoid hitting the bearing directly. Then reassemble the axel and adjust. For what it's worth, I've never known a Mavic bearing to need replacing (with the exception of the one inside the freehub), so I'd give it a good adjustment before I went to the trouble of replacing.
Sorry, but if it ain't broke...grz mnky
Jun 20, 2001 2:45 PM
...don't fix it.

Precision bearings like this are rated on the order of 60,000 of max. continuous use at max. load. You'd need to really mess things up to be looking at justifying replacement.

Sorry I didn't answer the question.