Description
Shimano Ultegra ST-6600R ST-6603L Road Bike 2×3 10 Speed STI Shifter Brake Lever
Has been inspected, ultrasonic cleaned, and lubed. Ready to be used.
Inventory number: 08306 TM-SL25
Industry Information:
The Shimano Ultegra ST-6600R and ST-6603L STI (Shimano Total Integration) shifters were the benchmark road bike control levers for the mid-2000s, part of the legendary 10-speed Ultegra 6600 groupset. These levers are known for their smooth, ergonomic shape and “Hidden Cable” design, where the shift cables are routed neatly under the handlebar tape, a significant aesthetic and functional upgrade from previous generations.
Key Features and Compatibility:
- 10-Speed System: The “ST-6600R” (right) is a 10-speed shifter, while the “ST-6603L” (left) is a 3-speed shifter, designed to work with a triple crankset.
- Derailleur Compatibility: For optimal performance, these shifters must be paired with their corresponding 10-speed derailleurs:
- Rear Derailleur: A Shimano 10-speed road rear derailleur, such as the RD-6600 (short cage for double) or RD-6603 (long cage for triple). It is also compatible with other 10-speed Shimano road derailleurs from that era, including those from the Dura-Ace 7800 and 105 5600 series. It is not compatible with newer 10-speed Tiagra 4700 derailleurs, which use a different cable pull ratio.
- Front Derailleur: The “ST-6603L” triple shifter is specifically designed for a triple front derailleur, like the FD-6603.
- Brake Compatibility: These levers use Shimano’s “Super SLR” brake pull ratio. They are compatible with most standard road caliper brakes and cantilever brakes. They are not compatible with V-brakes or linear-pull brakes, which require a different cable pull ratio (often referred to as “long pull”).
- Ergonomics and Design: The ST-6600 series was praised for its smooth lever action and comfortable hoods, which are still popular for vintage road bike enthusiasts. The internal cable routing was a major feature, cleaning up the cockpit for a more professional look.
- Maintenance: The shifters contain a complex internal mechanism. While they are generally durable, they can sometimes be prone to sticky shifting if the grease inside hardens over time. This can often be fixed by a careful cleaning and re-lubrication.
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(Bike Part Picker) Suggestions: (Powered by eBay Affiliate)
Shifter: (Double) Shimano Ultegra 6600 STI Dual Control ST-6600 (Triple) Shimano Ultegra 6600 STI Dual Control ST-6600/6603
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 do have a video to help in putting back together. 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.
