Alugear "Round" - 1-speed to 12sp 110 BCD 4b Shimano Asymmetric Road/Gravel

TECHNICAL SPECIFICATIONS

Offset:

38T–52T: 3.0 mm
54T: 2.0 mm
56T: 1.0 mm
58T: 0.0 mm
60T: -1.0 mm
62T: -1.5 mm

Diameter:
38T – 161.3 mm • 40T – 171.0 mm • 42T – 179.0 mm • 44T – 187.0 mm • 46T – 195.5 mm •
48T – 202.4 mm • 50T – 210.4 mm • 52T – 219.0 mm • 54T – 227 mm • 56T – 235 mm •
58T – 243 mm • 60T – 251 mm • 62T – 259 mm

Technology: Narrow-Wide tooth profile (1-speed)
Material: Aluminium 7075-T6
Manufacturing: CNC-machined
Surface treatment: Anodising

COMPATIBILITY

Fits Shimano cranksets with 110 mm asymmetric bolt circle (4 arms):
Dura-Ace R9200, Ultegra R8100, 105 R7100

Compatible chains:

• 12-speed Shimano HG+

• 12-speed SRAM Flattop

• KMC chains

Gear system: 1×12

⚠️ Note:
This 1x (single chainring) is not compatible with 2x (double-setup).
Only intended for use without a front derailleur.

INFORMATION

ALUGEAR chainrings are among the lightest on the market.
Through extensive testing and experience, the arm design has been optimised to significantly reduce weight without compromising strength.

The chainrings are CNC-machined from 7075-T6 aluminium and industrially hard-anodised to provide long-lasting protection against mechanical wear, a sleek appearance, and a pleasant surface finish.

The special Narrow-Wide tooth profile reduces chain noise, minimises wear, and ensures stable and smooth operation across the entire drivetrain – perfect for 12-speed systems.

ALUGEAR chainrings are the ideal choice if you want a technically advanced, lightweight, and stylish chainring.

RECOMMENDATIONS

• For the best look, you can use the ALUGEAR AERO COVER (for 105 R7100, Ultegra R8100, R8100-P (power meter) or Dura-Ace R9200, R9200-P crankset).

• Use only original ALUGEAR bolts for installation – other bolts may damage the cover.

• For installation, we recommend ALUGEAR bolts and nuts: 7 mm nuts and 6.5 mm bolts.

• Use a rear derailleur with a clutch system for optimal chain security.

• It is recommended to use a new chain with your new ALUGEAR chainring.