Description
Shimano Ultegra FC-6600/6603 48/39 teeth 175 Cranks Crankset Double Road/Cross/Gravel Bike 10-Speed
With Hollowtech II bottom bracket.
Has been inspected, sonic cleaned, and lubed. Ready to be used.
Inventory number: 09110
Industry Description:
The Shimano Ultegra FC-6600/6603 crankset, specifically with 48/39 teeth and 175mm crank arms, is a component that highlights versatility and the end of one era of road cycling
Here is a detailed breakdown of its industry information and compatibility:
Industry Information
- Market Position: The Ultegra FC-6600/6603 series was the core crankset of Shimano’s 10-speed Ultegra groupset (circa 2005-2009). It was positioned as the “workhorse” crank, offering the superb stiffness and efficiency of the top-tier Dura-Ace line but at a better value. It was a benchmark for mid-to-high-end mechanical drivetrains.
- Hollowtech II Technology: This crankset was one of the early adopters of Shimano’s Hollowtech II system. This design became the industry standard for road and mountain bikes, featuring:
- Integrated Spindle: The bottom bracket spindle is permanently attached to the right crank arm.
- Outboard Bearings: The large bearings sit outside the bottom bracket shell, increasing stiffness and durability.
- Ease of Installation: This system made installation and removal significantly simpler than previous standards like Octalink or square taper.
- The Chainring Configuration (48/39T): This tooth combination is a notable feature for this crankset, as it is a non-standard setup for a road crank.
- Standard Double (FC-6600): Typically came with a 53/39T or 50/34T (compact).
- Triple (FC-6603): Typically came with a 52/39/30T or similar.
- The 48/39T setup suggests the crank has been customized or was part of a specific OEM specification intended for cyclocross, touring, or early gravel use. The 48T outer ring is smaller than typical road rings, offering lower top-end speed but better clearances and a gear ratio more suitable for mixed terrain.
Crank Arm Length: The 172.5mm length is a very common size, suitable for a wide range of riders. Other lengths were also available (e.g., 170mm, 175mm).
Is the item out of stock, or not exactly what you are looking for?
(Bike Part Picker) Suggestions: (Powered by eBay Affiliate)
Crankset: (Double) Shimano Ultegra 53/39 teeth 172.5mm FC-6600 (Triple) Shimano Ultegra 53/39/30 teeth 172.5mm FC-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 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.
