Round Outer for 110 BCD 4b Shimano Asymmetric 2x11 speed

Chainring Outer ROUND AERO for 2-speed Shimano 110 BCD 4 holes Asymmetrical Dura-Ace R9100, Ultegra R8000, 105 R7000 (11 speed)

Size: 50T
Color: Black

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Processing time: up to 10 business days


Shipping time: 2 to 7 business days. Provided by FedEx

  Return Policy

You can return an unused product within 30 days

The original AERO design ALUGEAR chainring 2-speed



  • Intended to use: 2×11 speed for Road and Time Trial bike

  • Weights: 50 teeth – 112g; 52 teeth – 126g; 54 teeth - 142g

  • Optimum chainring combinations: 50-34; 52-36; 54-40

  • Mounting position: outside of the crank

  • Bolt circle diameter: 110 mm Shimano Asymmetric

  • Attachment: 4-arm spider

  • Material: Aluminum 7075-T6

  • Made: CNC milling

  • Surface coating: Anodizing


Delivery includes: 1 x outer chainring

(without Aero cover, without nuts and bolts)



  • For Shimano 2×11 speed cranks with 110 mm Asymmetrical bolt circle diameter (4-arms): Dura-Ace R9100; Ultegra R8000; 105 R7000 and Dura Ace 9000; Ultegra 6800; 105 5800; Tiagra 4700

  • Compatible with ALUGEAR Inner Сhainring only

  • Chainrings you may use the following chains: all 10sp, 11sp Shimano, SRAM; 10sp, 11sp Campagnolo, KMC chains

  • Shifting: 2x11 speed (only for use with double system and front derailleur)



ALUGEAR chainrings are some of the lightest chainrings on the market. Using our experience and vigorous testing, we tweaked the arm design and strategically machined the chainrings so that only minimal sacrifices were made in impact strength in exchange for large gains in weight reduction

With special tooth profiles, mount and climbing aids allow chainrings a particularly soft and fast switching. So with them a shift under load easily. The chainrings have been specially tuned by climbing aids and can only achieve their superior shifting performance in the combinations provided by Alugear

The chainrings are CNC machined from 7075 T6 aluminum and hard coat industrially anodized to provide protection from mechanical impacts, a good look, and an excellent tactile feel to each of the chainrings that lasts a long time
A unique tooth profile eliminates chain noise, reduces wear, and provides smooth operation on the entire system of all the most common combinations drive trains

The tooth profile is specially designed for use with Road chains

ALUGEAR chainrings are the best choice if you are looking for a technologically sound chainring with a unique design and low weight



  • For the best appearance you may use ALUGEAR AERO COVER (for Ultegra R8000 cranks)

  • Also you may use ALUGEAR chainring bolts and nuts for mounting

  • It is also a good idea to use a new chain with your new ALUGEAR chainrings

  • Optimum chainring combinations: 50-34; 52-36; 54-40

  • We recommend using the optimal ALUGEAR 2-speed chainring combinations

  • The correct operation of the double set is guaranteed only when using ALUGEAR outer and inner chainrings together

  • Please remember that when replacing chainrings (especially when altering the size of the outer chainring), it is necessary to adjust the front derailleur


Delivery includes: 1 x outer chainring. (without Aero cover, without nuts and bolts!)


Data sheet

for 11sp 110 BCD 4b Shimano Asymetric

Specific References

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