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Description
The Epicenter Of Ultegra Power Transfer
The Shimano Ultegra FC-R8100 12 Speed Crankset is built with stiffness, weight, and power transfer in mind. Weighing only around 700g it also has an extremely low rotational weight.
The Ultegra FC-R8100 uses HOLLOWGLIDE for smooth shifting and excellent chain retention along with HOLLOWTECH II technology that stiffens the rotating mechanism, making power transfer more effective.
An integral part of Shimano's new 12-speed road lineup, the FC-R8100 crank builds upon Shimano's legendary front shifting and transmission efficiency. With new refinements for seamless 12-speed shifting, the Ultegra crank is now offered in lengths from 160 to 175 mm, bringing performance and improved fit for smaller riders, triathletes, and riders with specific biomechanical requirements.
Features
- Optimal balance of stiffness, strength, weight, and rotational performance
- HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quick, precise front shifting
- HOLLOWTECH II technology provides the best balance of stiffness, strength, weight and rotating performance
- 52-36 and 50-34 chainring options. 160, 165, 170, 172.5, and 175 mm crank arm lengths.
- Average weights: 711g (52-36T) 700g (50-34T)
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
Specifications
Average weight: 711g (52-36T) 700g (50-34T) | |
BB_Pressfit: SM-BB72-41B | |
BB_Threaded: SM-BBR60 | |
BB Shell Width: 70 | |
Compatible chain: CN-M8100 | |
Q-Factor: 148 mm | |
Chainline: 44.5 mm | |
P.C.D.: 110 mm | |
160mm - 50/34 Tooth | Mfg PartNum: IFCR8100MX04 |
160mm - 52/36 Tooth | Mfg PartNum: IFCR8100MX26 |
165mm - 50/34 Tooth | Mfg PartNum: IFCR8100AX04 |
165mm - 52/36 Tooth | Mfg PartNum: IFCR8100AX26 |
170mm - 50/34 Tooth | Mfg PartNum: IFCR8100CX04 |
170mm - 52/36 Tooth | Mfg PartNum: IFCR8100CX26 |
172.5mm - 50/34 Tooth | Mfg PartNum: IFCR8100DX04 |
172.5mm - 52/36 Tooth | Mfg PartNum: IFCR8100DX26 |
175mm - 50/34 Tooth | Mfg PartNum: IFCR8100EX04 |
175mm - 52/36 Tooth | Mfg PartNum: IFCR8100EX26 |
Reviews
The Ultegra 12 speed group set is as good as advertised, as long as it is set up correctly you really don�t have to worry about dropping chains or sloppy shifts. I bought the 170mm cranks as it is a better choice for my height of 68.5�, I used both calculations found online for correct crank length. I�ve found it easier to breathe while in the drops compared to the 172.5mm cranks that came with my bike as my legs are no longer contacting my gut. I also believe having the shorter cranks has been good for my hips as well, I was feeling some pain at times from a slight impingement but since using these cranks it hasn�t bothered me. I was slightly concerned about losing some power with the shorter lever but I can still hit my max wattage, I might have to spin slightly faster but it�s not really noticeable.
The crankset has a nice finish and a smooth manufactured surface on the cranks and chainrings. This is my first 12 speed product and don't have many miles on the product yet. Installation was easy and once the chain and shifters were calibrated, the crankset operated with little noise and shifted perfectly. I have used Shimano Ultegra on several of my bikes and have had no problems.
reasonably light, solid performance, decent price, all the same features as the top of the line dura-ace product (with only a small weight penalty, but minus the huge extra cost), and in my subjective opinion, a more appealing aesthetic with the matte rather than glossy/polished finish. overall quite satisfied with the purchase, and would buy again and recommend to others!
Mechanic's Corner
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