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Old 08-18-06, 03:06 PM   #1
slowandsteady
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Cassette in pieces?

Forgive the probably obvious n00b idiot question. But here goes.

So I ordered a 12-27T Ultegra cassette from probikekit.com to replace my 11-23T 105 cassette. Well it came in a bag completely disassembled. Is this normal? And can I just replace the individual cogs as I wish? I really only want a couple of large cogs to accomodate the hills. I still want the 11t.
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Old 08-18-06, 03:30 PM   #2
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There's no problem with the cassette being in pieces. Some of them just come with little rivets holding them together for convenience.

As for replacing individual cogs, it will adversely affect shifting unless you do it VERY carefully. Read this: http://sheldonbrown.com/k7.html#custom
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Old 08-18-06, 03:33 PM   #3
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They usually don't come disassembled, but you can replace the individual cogs as you wish. Something to keep in mind, though, is that modern cogs are designed to sit next to another cog of a specific size in order for the Hyperglide or other shift-assist ramping to work. So, there might be two versions of a 13T cog - one designed to go next to a 12T and one designed to go next to an 11T. You can still definitely use the different individual cogs. The shifting to or from those cogs might not be as smooth, though. I don't think this a big deal - your indexing will work fine, and you can put up with slightly rougher (but still pretty dang smooth) shifting for sake of some larger cogs. Go for it, add the cogs you want and ignore the rest.
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Old 08-18-06, 03:58 PM   #4
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The stuff from probikekit.com comes in the OEM packaging (i.e plastic bags; no box). Often there are no instructions and things are loose (in particular, the cassettes). That's one of the reasons they are so cheap. You can download and print the assembly instructions from shimano.com.
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Old 08-18-06, 07:09 PM   #5
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If you read the theory according to Shimano, ramps on cogs are designed with the next one in mind. I think it makes a difference for aggressive shifting – in a race or when standing on the pedals, for instance. However, practically speaking, I don't think it makes any difference whatsoever for commuting, utility cycling, touring and other similar ventures. I would also add that the benefits (if any) should be more evident when there is a wide gap between cogs.

Just as an example, I have cobbled my cassettes from a mixture of 11-30 (8 speed), 11-32 (9 speed) and 12-25, plus 1-2 loose cogs from Harris Cyclery. One bike has 12-14-15-16-17-19-21-25-34, another has 12-15-16-17-18-20-23-26-32 and the 3rd wheel has 11-13-14-15-17-19-21-25-32. Nobody complains.
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Old 08-18-06, 07:26 PM   #6
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Of course the individual cogs are in pieces. That's because the freehub that the cogs will be mounted on is part of your rear wheel. Shimano Ultegra cassettes have the three lowest gears riveted together on a lightweight carrier and Dura Ace may have the 6 lowest gears riveted together on two carriers, which is one of the reasons that when I cobble together my 'custom' 10-speed cassette (11,12,13,14,15,17,19,21,23,25), I went with Ultegra so that I could remove a middle cog and replace it with the 11T. By the way, Shimano 11T cogs and 12T cogs use different locking rings, so use the one appropriate for your combo.

Last edited by NoRacer; 08-19-06 at 02:17 PM.
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Old 08-18-06, 07:45 PM   #7
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Quote:
Originally Posted by NoRacer
Of course the individual cogs are in pieces. That's because the freehub that the cogs will be mounted on is part of your rear wheel.
The Shimano XT 11-34t cassette I bought for my MTB came in a box and was mounted on a plastic pseudo-freehub so they aren't all loose.
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Old 08-18-06, 07:53 PM   #8
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Take the 11T from the 11-23 cassette and remove the 16T from the 12-27 cassette and you'll have your 11-27 custom cassette. This is the most common way to do it anyway (I'm assuming there's minimal wear on the 11T). BTW you're only gaining one larger cog for the hills (the 27), next cog down is 24 which is essentially equivalent to your existing 23; all of the other cogs are the same down to and including the 12.
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Old 08-19-06, 12:34 PM   #9
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Of course the individual cogs are in pieces.....Shimano Ultegra cassettes have the three lowest gears riveted together on a lightweight carrier
This was an ultegra cassette. It is in pieces. None of the gears are riveted together at all.
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Old 08-19-06, 12:39 PM   #10
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Take the 11T from the 11-23 cassette and remove the 16T from the 12-27 cassette and you'll have your 11-27 custom cassette. This is the most common way to do it anyway (I'm assuming there's minimal wear on the 11T). BTW you're only gaining one larger cog for the hills (the 27), next cog down is 24 which is essentially equivalent to your existing 23; all of the other cogs are the same down to and including the 12.

Thanks this may be what I do. I really only need the larger cog. I live in a relatively flat area, and the 11-23 is fine for most rides. It just starts to be hard on rides closer to three hours or more. My legs just can't mash after three hours. I just keep thinking as my legs burn.....if I only had one more cog to go to...
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Old 08-19-06, 02:21 PM   #11
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Quote:
Originally Posted by slowandsteady
This was an ultegra cassette. It is in pieces. None of the gears are riveted together at all.
If it is an Ultegra 9-speed or 10-speed it should have at least the largest three cogs riveted to a common carrier.

http://cycle.shimano-eu.com/media/cy...9830537975.pdf

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