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Drive Train Time

Old 09-03-12, 02:18 PM
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tromper
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Drive Train Time

Getting a distinct skip under load on my pleasantly ancient Trek 750 Multitrack (lugged steel for those who care)

I chucked on a new chain since that's on the list, this didn't get it so I'm thinking I have a crack in a chain ring or just plain too much wear on the drive train somewhere.
I'm about to go through it all & am debating going to an internal hub setup.

Any cautions or thoughts on that? Maybe just pick up a public or linus (any big diff between those marques?)

Thanks for any thoughts even mild flames :-)
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Old 09-03-12, 02:33 PM
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Chain skip is almost always a chain/sprocket wear problem. Replacing the chain only never solves it, and usually makes it worse. In fact often a non skipping drivetrain will first start to skip this wat when the chain is replaced (but not the cassette).

The skipping is usually in the cassette, so that's the likely candidate for replacement, but it could also be the chainring. One hint is if it skipps fairly equally on all rear sprockets but only a particular chainring, or the more common opposite that either chainring skips when using the outer half of the cassette (or freewheel) which are the most used, hence the most worn.

Chain/sprocket is normal wear and tear, but with decent (not obsessive) care, a chain should last 3-5,000 miles, and a cassette 3-4 times that.

IGH hubs are fine and well suited to many applications, so change if you prefer, but the economics of chain wear isn't a good reason.
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Old 09-03-12, 02:59 PM
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Not so much the economics, in the end Internal Gear Hubs use a chain or belt as well. Part of it is change of pace, the other part of the thought would be to simplify the bike a bit and allow for a chain guard for Seattle area winter cycling (land o drizzle). Been rolling the cuff or tying back the pant leg for years, but that's never been that satisfactory a solution.
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Old 09-03-12, 03:02 PM
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AS FB states the cassette has likely gotten worn into the elongated chain. I'd change out the cassette and if that solves the problem you are done. If the chain rings are worn as well, as evidenced by continued skipping (less likely), you will have needed to replace the cassette anyway.
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Old 09-03-12, 04:11 PM
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Originally Posted by tromper View Post
Not so much the economics, in the end Internal Gear Hubs use a chain or belt as well. Part of it is change of pace, the other part of the thought would be to simplify the bike a bit and allow for a chain guard for Seattle area winter cycling (land o drizzle). Been rolling the cuff or tying back the pant leg for years, but that's never been that satisfactory a solution.
I understand, but it's an expensive changover from what you have. If you know that's where you're headed, you could have saved on the chain, but at this point, it's in for a penny, in for a pound, and the only way you can get value from the new chain is to replace the cassette.

As for the IGH option, if that's better for your needs, you'll have to bite the bullet and this may be when you decide to do it, especially if your rear wheel is on it's last legs. Or you can keep this bike alive, scout out a used bike at a garage sale and build up an IGH bike fresh, keeping this one for sport or as a backup.
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