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9 Speed Cassette

Old 08-03-23, 03:43 PM
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9 Speed Cassette

I have an old Merlin with a Shimano 6600 set-up. Recently the rear cassette has worn out. Part number is CS-6600 a nine speed unit with 12-27 teeth.

The problem is no new parts, no old parts (except Morocco!). I also need the low gears because I'm an old rider...

The question is what to try. I have a 6600 Left shifter that is 10 speed. So I suppose I could buy a 10 speed cassette. I'm assuming the old rear derailleur would work with
a ten speed shifter.

Or is there some aftermarket cassette that I don't know of?

I keep running into issues like this, wanting to keep an old bike which works perfectly for me.

Any other ideas are welcome. I just want to ride the darn bike...

Cheers.
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Old 08-03-23, 03:55 PM
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I'm confused...6600 is 10-speed, not 9 speed. CS-6600 is a 10-speed Ultegra cassette. The left shifter will be either 2x or 3x, not 10.
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Old 08-03-23, 03:56 PM
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Originally Posted by cometboy
I have an old Merlin with a Shimano 6600 set-up. Recently the rear cassette has worn out. Part number is CS-6600 a nine speed unit with 12-27 teeth.

The problem is no new parts, no old parts (except Morocco!). I also need the low gears because I'm an old rider...

The question is what to try. I have a 6600 Left shifter that is 10 speed. So I suppose I could buy a 10 speed cassette. I'm assuming the old rear derailleur would work with
a ten speed shifter.

Or is there some aftermarket cassette that I don't know of?

I keep running into issues like this, wanting to keep an old bike which works perfectly for me.

Any other ideas are welcome. I just want to ride the darn bike...

Cheers.
The CS-6600 should be 10 speed.

Also, what right (rear) shifter are you using? And the rear derailleur model #.
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Old 08-03-23, 03:56 PM
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6600 is a ten speed group from Shimano. If the part number is CS-6600, that is a 10 speed cassette. Low cost cassettes of 9 and 10 speed are easily available from numerous venders. Microshift makes decent cassettes that are heavier than higher cost ones, but work great. You do not state what the rear derailleur is, but 8,9,10 speed are generally compatible, for Shimano, anyway. Your left shifter is normally for the front derailleur, and is either for a double or triple crankset, or both. What right shift lever do you have? That is what normally operates the rear derailleur. If your right shifter is a 9 speed lever, it will not work well with a 10 speed cassette, and vice versa. So, if that is a full 6600 group, I am perplexed at how you were using a 9 speed cassette.
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Old 08-03-23, 04:16 PM
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I'm sorry that I have appeared to have screwed up. Not uncommon lately.

Thank you for the replies. I will look at my set-up and decide what I actually mean.

Cheers.
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Old 08-03-23, 05:17 PM
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Originally Posted by cometboy
I'm sorry that I have appeared to have screwed up. Not uncommon lately.

Thank you for the replies. I will look at my set-up and decide what I actually mean.

Cheers.
Google N speed cassette and you'll find a lot of lower (and higher) cost options.
Just make sure the largest cog doesn't exceed the capacity of your RDER.

If you use a larger largest cog, you'll probably need to lengthen the chain. It's probably a much better idea to get a new chain for a new cassette.
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Old 08-04-23, 08:36 AM
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Don't forget that if you are needing to know where to get something, it helps to know where you are located. Otherwise you'll get a lot of recommendations for places that only ship domestically and if they aren't domestic to you, you'll be SOL.

Welcome to BF.
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Old 08-06-23, 04:50 PM
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Try TotalCycling. They have lots of OEM parts not made anymore.
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Old 08-09-23, 08:20 PM
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It is possible that the cassette is set up as a "9 of 10", where one cog is removed because the rear hub is 7 speed. Only 9 cogs will fit on that. I set up a bike like that once, but after a short time opted to get a new hub that would take the full 10 cogs.

Edit: I should clarify that it will be a 10 speed cassette but with only 9 cogs on it. Spacing and cog pitch will still be 10 speed. That's all assuming that the cassette you have truly has 9 cogs.

Last edited by zacster; 08-10-23 at 11:15 AM.
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Old 08-09-23, 10:27 PM
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