Upgrade AERO Kit for ULTEGRA R9100 2x11sp. Chainrings + Cover

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Technical specifications

Intended use	2X 11sp. for Road and Time Trial bike
Optimum chainring combinations	50-34; 52-36; 54-40
Mounting position	outside 50T; 52T; 54T; inside 34T; 36T; 40T
Bolt circle diameter	110 mm Shimano Asymmetric
Weight	50 teeth - 112g; 52 teeth - 126g; 54 teeth - 142g; 34 teeth - 26g; 36 teeth - 29g; 40 teeth - 39g; Cover - 17g; Bolts (M8 11,5mm) - 8g
Material	Aluminum 7075-T6
Made	CNC milling
Surface coating	Anodizing

Compatibility

Shifting	Shifting: 2x11
Chains	Chainrings you may use the following chains: all 10sp, 11sp Shimano; SRAM 10sp, 11sp; KMC chains
Cranks	For 2×11 cranks Shimano Dura-Ace R9100 with 110 mm Asymmetrical bolt circle diameter (4-arms); Not compatible with Shimano 2×11 cranks with PowerMeter

Shifting

Shifting: 2x11

Chains

Chainrings you may use the following chains:

all 10sp, 11sp Shimano;

SRAM 10sp, 11sp;

KMC chains

Cranks

For 2×11 cranks Shimano Dura-Ace R9100 with 110 mm Asymmetrical bolt circle diameter (4-arms);

Not compatible with Shimano 2×11 cranks with PowerMeter

Recommendations

It is also a good idea to use a new chain with your new ALUGEAR chainrings
It is recommended to use a well-lubricated chain on every ride
We recommend using the Optimal Alugear 2-speed chainrings combination
The correct operation of the 2X set is guaranteed only when using Alugear outer and inner chainrings together
Please use only original ALUGEAR Bolts during installation. Using other bolts may cause damage to the Сover
Tool holder: 5 mm hexagon socket maximum permissible torque: 10 Nm

Installation Instructions

Alugear 2X chainring installation with the AERO cover	Download
Front Derailleur Adapter Installation for 56T-40T set	Download

7075-T6

Aerospace grade aluminium

Ramped & pinned

Reliable 2X shifting under any conditions

8+ colours

Match your bike with multiple anodized options

Information

Engineering excellence

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, ramp and climbing aids allow the chainrings particularly soft and fast shifting. So with them, shifting under load is easy. 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.

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Designed with real riding experience in mind

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