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Description
Shimano 105 FC-RS520 Crankset - 172.5mm, 12-Speed, 50/34t, 110 Asymmetric BCD, Hollowtech II Spindle Interface, BlackThe Shimano 105 FC RS520 is a 2 piece, 4 arm crank that's compatible with modern disc brake road frames. 4 arm crankset for 12 speed drivetrain Compatible with frames of O. L. D. 135mm and 410mm chainstay length 44. 5mm chainline 150mm Q factor Compatible with HG 12 speed chains Product Specifics Color: Black Rings: 50 34 Number of Chainrings: Double Crank Length (mm): 172. 5 Crank Intended Use: Road Drivetrain Speeds: 12 BB Included: No Pedal
The Shimano 105 FC-RS520 is a 2-piece, 4-arm crank that's compatible with modern disc brake road frames.- 4-arm crankset for 12-speed drivetrain
- Compatible with frames of O.L.D. 135mm and 410mm chainstay length
- 44.5mm chainline
- 150mm Q-factor
- Compatible with HG 12-speed chains
Product Specifics
- Color: Black
- Rings: 50/34
- Number of Chainrings: Double
- Crank Length (mm): 172.5
- Crank Intended Use: Road
- Drivetrain Speeds: 12
- BB Included: No
- Pedal Spindle: 9/16"
- Spindle Interface Type: Shimano Hollowtech II
- Chainring BCD: 110 Shimano Asymmetric
- Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay
Today's Stock Status
6 Available to ship in 2-4 Business Days
UPC: 192790172446
EAN: Not available
Manufacturer Part Number: Does Not Apply
CK9891
181411-Q0-L
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Tight squeeze for a 240w but works well
Color: Black
This works pretty well. It was a little bit of a tight squeeze for a 240w brick, but it's stable at least. Strong adhesive
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Reviewed in the United States on April 7, 2026
★★★★★ 5
Great for a gaming laptop!
Color: Black, Size: 1.37" without hook
Great product is you want to mount any size laptop under your desk. I used it for my Alienware gaming laptop and it's fantastic! The three points of contact hold the laptop securely, while allowing maximum airflow for the fans. The three "clamps" are rock solid and will definitely outlive the laptop. The installation was simple and easy, just need a drill.
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Reviewed in the United States on March 15, 2026
★★★★★ 5
under desk laptop system
Color: Black, Size: 1.37" without hook
Reclaimed real desk space with this one. The mount holds the laptop securely underneath without any vibration or creaking and the installation required no drilling — clamped cleanly to the desk edge. The ventilation spacing is generous enough that thermals stay reasonable even under load. Works with a solid range of laptop sizes and the adjustment mechanism is easy to use. If your laptop spends most of its time docked this is the cleanest way to get it out of the way.
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Reviewed in the United States on March 25, 2026
★★★★★ 4
Works great, but pads are peeling.
Color: Black, Size: 1.37" without hook
Works for what I needed, which was to mount my work laptop to the side of my desk. However, the rubber pads started peeling the first day. I tried clamping them down overnight, but they still ended up peeling up. They haven't come off completely and are still working, though. I may have to glue them down.
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Quality product.
Color: White, Size: 1.37" without hook
First of all it's made of metal so, I won't worry about accidentally breaking it and dropping my laptop. It came with adhesive rubber pads that fit inside the brackets, which is a nice touch for helping not to scratch up the laptop. It makes a huge difference to help declutter the desktop space.
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Reviewed in the United States on March 18, 2026