Description
Shimano Ultegra 10-speed CS-6600 12-23t Cassette
Has been inspected, ultrasonically cleaned, and lubricated. Ready to be used.
Inventory number: 10122
Industry Description:
The Shimano Ultegra CS-6600 is a 10-speed road cassette, a key component of the venerable Ultegra 6600 groupset from the mid-2000s. The “12-25t” designation refers to its gear range, with the smallest cog having 12 teeth and the largest having 25.
Key Features and Compatibility:
- 10-Speed System: This cassette is designed exclusively for use with 10-speed drivetrains. It must be paired with a 10-speed chain (like the Shimano CN-6600 or CN-5600) and 10-speed shifters and derailleurs. It is not compatible with 9-speed, 11-speed, or 12-speed systems.
- Hyperglide (HG) Technology: Like other Shimano cassettes, the CS-6600 features Hyperglide technology. The cogs are specially shaped with strategically placed ramps and tooth profiles to facilitate smooth, rapid shifting under load.
- Freehub Compatibility: The CS-6600 cassette is designed to fit on a standard Shimano/SRAM-style freehub body. It can fit on both 8/9/10-speed freehubs and the wider 11-speed road freehubs (with the use of a 1.85mm spacer behind the cassette).
- Weight and Construction: The cogs are made of steel for durability, but some of the larger cogs may be mounted on an aluminum spider to reduce weight. The 12-25t is considered a “close ratio” or “racing” cassette, offering small jumps between gears for smooth cadence transitions.
- Dura-Ace 7800 Hubs: There is a known and specific compatibility issue with some older Shimano Dura-Ace FH-7800 hubs and WH-7800 wheels. Certain CS-6600 cassettes with 13-16 tooth smallest cogs will not fit properly on these hubs due to a different spline depth. The 12-25t version, however, generally does not have this problem.
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A little about the seller:
I’ve been in the cycling industry for more than 30 years (I know, that makes me old!). I’ve been a professional bicycle mechanic for most of those years, including working locally at Lee’s Cyclery before they became Trek Stores. Now I work from home as a Customer Success Manager for a software team. But I still love fixing up and working on bikes and riding them too!
Purchase from me with peace of mind. Not only can you trust my years of experience, but I will also fit you for the bike and provide any mechanical insight at the time of purchase.
Shipping information:
I ship USPS Ground. I try to keep it simple. It will be packed very well, but if you see any damage to the box or Part, keep the box and packing material plus, take pictures. I do insure all parts that are shipped. In addition, if shipped out of Colorado, there is no Sales Tax. You can also combine shipping with multiple items.
