tygger

I'm trying to repair an old Trek 6000 mountain bike. The rear wheel was making a grinding-like noise while coasting, so I thought it was the free-hub. I replaced the freehub and repacked the bearings, and it's still making the noise. Maybe the bearings, cups, and/or cones are worn, but it wasn't apparent when I removed them initially. Any ideas?

If it is a cup and cone issue, I don't have the skills to replace the hub. Thinking about buying a cheap wheel just to get it rolling again. The current wheel says Bontrager Ranger, ETRTO: 559x18 and ERD: 541 on it. Does anyone have a recommendation for a decent budget replacement? 9 speed, disc brakes.

Thank you

alcjphil

A grinding noise only while coasting indicates a problem within the freehub body. These can easily be replaced without changing the hub

CliffordK

First try to replicate the problem off the bike. Can you feel extra friction somewhere, or perhaps feel/hear rubbing?

Anything rubbing on the frame (freehub/freewheel/cassette), Tire, etc?

tygger

Looks like I can't post a video yet.

After replacing the freehub with a brand new one, the sound is still there, but a little less noticeable. The sound is much more apparent when the wheel is spinning as opposed to spinning the cassette by hand.

JoeTBM 

Do you have a dork disk on that wheel. If it is warped it may generate that noise as the cassette spins against it. Try it with it removed.

CliffordK

You are still a couple of posts short of 10. When you get to 10 or 11, you should be able to post your photos and links.

In the meantime, you can upload photos to your album:

@tygger's Album:
https://www.bikeforums.net/g/user/84770

In the advanced editor, try unchecking the boxes below and see if it will accept your link. (or obfuscate the link).

Iride01 

Don't worry about it till something quits working correctly. Then maybe you can figure out what that noise was so you can take care of it next time you hear it.

tygger

Thanks. Hit my max limit of post per day yesterday. Almost to 10. Will post link soon.

tygger

Yes, there is a dork disc. Interesting. I'll try to remove that this evening and see if it's problem, but from my rookie ears, it doesn't sound like it.

tygger

Here's a video of the issue before I replaced the free hub.

Iride01 

Well the noise we hear in the video is simply the pawls that let the free hub free itself when coasting. Much like a ratchet wrench. It does seem like you might have some excessive friction when turning it backwards, but that is hard to say without being there.

If the top run of the chain didn't go slack when coasting, then probably not too much to worry about.

If you want and have the tools, you can always remove the cassette and freehub. And then clean and lubricate using the recommended lubricants of your freehub manufacturer the bearings and pawls. Some want a very light grease others nothing but maybe very light oil on the pawls.