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Ships within 48 hours · Estimated delivery Jul 28 - Aug 2
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Description
Ultegra FC-R8100The ULTEGRA FC R8100 crank performs two vital functions: transferring your pedaling effort into the drivetrain and ensuring the fastest, most precise front shifting available. Thanks to HOLLOWTECH II and HOLLOWGLIDE technologies, Shimano's class leading chainring designs, the FC R9200 strikes the optimal balance of stiffness, strength, weight and rotational performance. Optimal balance of stiffness, strength, weight and rotational performance
- The ULTEGRA FC-R8100 crank performs two vital functions: transferring your pedaling effort into the drivetrain and ensuring the fastest, most precise front shifting available. Thanks to HOLLOWTECH II and HOLLOWGLIDE technologies, Shimano's class-leading chainring designs, the FC-R9200 strikes the optimal balance of stiffness, strength, weight and rotational performance.
- Optimal balance of stiffness, strength, weight and rotational performance
- HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting
- Available chainring options: 52-36, and 50-34T, and crank lengths: 165, 170, 172.5, and 175mm
- HOLLOWTECH II Technology
- BB set not included
Attributes
| BB Inclusion | No |
| BCD | 110 |
| Chainline | 43.5mm |
| Crank Spindle Diameter | 24mm |
| Crankset Material | Aluminum |
| Drivetrain Spacing | Road Disc |
| Interface | Hollowtech II |
| Pedals Thread | 9/16'' |
| Primary Color | Black |
| Speed | 12 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 27 reviews
Sort
Product Reviews
★★★★★ 5
I use these exclusively for when I'm hiking, cycling and walking ( exercising )
Size: X-Large, Color: Black
5.7.2019 Update:
I have probably five packs of 3 of these socks. Can't explain it but recent pairs I've been using have lasted longer than previous two packs ( 6 socks )... So I'm going to get some more...
They are my #1 go to sock for cycling, hiking, climbing, walking ( serious, training, speed, distance )...
10.30.19:
I use these exclusively for when I'm hiking, cycling anqd walking ( exeqrcising )...
They are light, comfortable, keep feet dry, cool & comfortable... They don't shift around on feet. They stay put once put on and running, climbing or cycling shoes are put on and laced up or ratched...
I do a lot of hill climbing and also use on terrain where there's lots of long periods ( hours ) going up & hours going down...
They don't appear to be very durable, get holes in toe or holes in heels, but 3 pack is relatively inexpensive so I continue to buy them.
I do not use them for everyday casual wear because they would wear out very quickly compared to other similar sockets...
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 30, 2018
★★★★★ 4
These socks are just OK. One arrived with a ...
These socks are just OK. One arrived with a hole (easily sewn up, but kind of bummed about that). I prefer the Under Armour Resistor socks - they have support built into the socks that you actually can feel, and they were same price for 6 pairs!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2017
★★★★★ 5
Asics is SOUND
Size: Small, Color: White
prefect to wear with asics wrestling shoes
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 29, 2025
★★★★★ 5
Excelente
Size: Medium, Color: Black
Excelente
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Bellas
Size: 13 Little Kid, Color: Pink/Glitter
Son una belleza quedan muy lindas puestas se las recomiendo para las niñas de la casa
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 7, 2025
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