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Old 11-09-09, 02:46 PM   #1
mainducoyote
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Is this 6 speed cassette supposed to look like that?

I'm getting to list a Bianchi I finished overhauling but I'm a quite perplexed by the look of the rear cogs. The wheelset comes from a bike equipped with a Shimano 600 arabesque group showing very little wear.

The bike shifts perfectly and the chain doesn't skip under load so I'm wondering if the teeths are designed that way.

I sell my bikes in ready to ride condition so I don't want to sell a bike with worn cogs knowing how hard to find are those cassettes.



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Old 11-09-09, 02:50 PM   #2
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yes. normal design characteristics of the HG/IG cassette.
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Old 11-09-09, 03:33 PM   #3
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Thanks, somehow I had never noticed the the shape on others I have had.
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Old 11-09-09, 03:44 PM   #4
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I'm fairly certain those middle four are worn. Look at the difference between the low and high cog that sandwich them. I believe your 'shark fin' cogs should look similar. It's a UG 'twisted tooth' cassettet/freewheel, not a later HG/IG.

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Old 11-09-09, 03:52 PM   #5
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yes. normal design characteristics of the HG/IG cassette.
Except it's not a HG/IG cassette, it's a freewheel.

The teeth are worn.
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Old 11-09-09, 03:58 PM   #6
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It is actually the short lived 6speed cassette. look at the last cog see the slots for the other cogs to slide on to? also I agree the middle cogs look very worn. the 'twist tooth' cogs look perfectly normal
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Old 11-09-09, 04:06 PM   #7
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Yes, its a cassette, before posting I was certain someone would try so correct me. I find it odd that the first and last cog look unused while the middle cogs show exactly the same wear. Also would the teeth be worn on only one side?
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Old 11-09-09, 04:22 PM   #8
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Yes, its a cassette, before posting I was certain someone would try so correct me. I find it odd that the first and last cog look unused while the middle cogs show exactly the same wear. Also would the teeth be worn on only one side?
Yep, because that's where the chain makes contact, pulling the wheel along. I don't think the wear is all that uncommon if you live in a fairly flat terrain. With my wimpy legs and the hilly terrain, the larger cogs definitely receive most of the wear on my bikes, but I'd imagine on flat terrain I'd primarily use cogs on the center of the cassette.
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Old 11-09-09, 04:55 PM   #9
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I stand corrected on the FW/Cassette status.

The wear doesn't look logical to me, though. The chain pulls the cogs in a clockwise fashion, which doesn't make sense to me that the lead edge of the cog, which doesn't have the chain pulling against it, is worn in a slope. The only thing I can think of is that the cogs were worn, and the previous owner flipped the cogs over to use the other side.

If you look at this image, which was from Sheldon Brown's page on Chain Maintenance, you can see that worn cogs should look like a shark fin, with the shark facing the back of the bike:

Yours are opposite, which is why I believe the previous owner flipped the cogs around to get more life out of them.
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Old 11-09-09, 05:27 PM   #10
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Yours are opposite, which is why I believe the previous owner flipped the cogs around to get more life out of them.
Ah, that makes sense. But what's with the arrows on those cogs?

mainducoyote, looks like you've got a second life on that cassette!
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Old 11-09-09, 05:57 PM   #11
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I have it figured out now....its a 6-speed cassette with HG cogs inserted into the 2, 3, 4 and 5 positions. The first cog (high gear) is a screw on uni-glide while the last cog (low gear) is a uni-glide cog as well.

The tooth profile of the HG/IG is normal.
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