Mon-Sat 8am-5pm PT
Sign Up
Serving cyclists
since 2002
Shimano Ultegra FC-R8100 12 Speed Crankset
Shimano Ultegra FC-R8100 12 Speed Crankset
Shimano Ultegra FC-R8100 12 Speed Crankset
Click Here for Larger Image
Shimano Ultegra FC-R8100 12 Speed Crankset
Shimano Ultegra FC-R8100 12 Speed Crankset
Shimano Ultegra FC-R8100 12 Speed Crankset

Shimano Ultegra FC-R8100 12 Speed Crankset

Mfg PartNum:
In Stock
Ships Free!
Earn $18.89 in VIP credit. Click to Learn More.
This model is not eligible for VIP points
Please Confirm Model

Backorder: This item is currently not in stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

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.


  • 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.

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 

Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 4/19/2023
by Anonymous
Cycling Enthusiast
San Diego, CA
Value Rating
Overall Rating
great crankset at a reasonable price

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!

Was this review useful to you? Yes/No
Thank you for your feedback.
Reviewed 9/5/2022
by BB in AZ
Overall Rating
Easy installation and setup

As with all Shimano cranksets, easy to install and adjust Di2. Finish isn't as nice as Dura Ace, but is half the price and works just as well

Was this review useful to you? Yes/No
Thank you for your feedback.

Articles will open in new tab.

A guide to understanding and calculating bicycle gear inches.

We are committed to delivering outstanding value and service to our customers, every day.
Try us today to see why so many of our customers come back again and again.

*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Fri). Orders over $50
are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 79


Want to save on all your Bike Tires Direct purchases? Sign up here for exclusive discount offers.

BikeTiresDirect on Facebook BikeTiresDirect on Instagram BikeTiresDirect on Strava
5741 NE 87th Ave (I-205 exit 23B) Portland, OR 97220 | 800-682-0570 | [email protected]