AeroCoach Aten DUAL road 2x aluminum/carbon chainrings

Please note: Aten 2x 110bcd 4bolt and 130bcd chainrings are in stock, 107bcd 4bolt shipping Spring 2024

Aten road 2x chainrings are the most aerodynamically advanced chainrings for top level time trial and triathlon usage, featuring the AeroCoach ARC subtle noncircular design

Machined from aluminium and reinforced with a carbon backer plate, Aten chainrings feature a lenticular outer profile with an undulating chain ridge, helping to keep the airflow attached over the chain as it passes down the face of the chainring. Aten road chainrings are 11 and 12 speed compatible.

Removable bolt covers ensure that the surface of the ring is uniform to the crankset spider.

Aten 2x chainrings have 4 shifting ramps on the outer ring and custom teeth profiles to enable smooth and effective shifting.

AERODYNAMICS

Aten road chainrings benefit from the unique Aten design which provides optimal airflow transition from chain to chainring, and across the chainring itself with the smooth lenticular profile.

BIOMECHANICS

Due to the higher speeds involved in a time trial, inertia and momentum is much greater than normal. This causes pedal speed to be much smoother, and means that for a time trial (high speed) large increases in gearing and dramatic noncircular shapes are not optimal:

The ARC shape increases gearing quickly at the beginning of the pedal stroke as this is when the main force producers activate (gluteus maximus, vastus medialis & lateralis, as well as the tibialis anterior). After this period gearing is maintained all the way through the highest torque phase before gradually decreasing down to a minimum gearing at bottom dead centre. This smooth dropoff is when the effect of gravity and the lower leg muscles come into play.

The unique time trial specific design will help increase power output by 3-5w, and allow a smoother pedal stroke than normal. Unlike other noncircular designs you can train on an Aten ring without causing a detriment to your pedal stroke and swap between round/Aten rings without difficulty. In addition, there will be little to no artificial power inflation when using the Aten with a crank/pedal based power meter.

UCI LEGAL

Aten chainrings are compliant with the latest UCI regulations regarding equipment and may be used in UCI sanctioned events.

COMPATIBILITY

Aten road chainrings are compatible with 11 and 12 speed chains, and with the following cranksets:

130bcd 5 bolt (non-power cranks, and power meter cranks where the power pod is contained within the chainring spider)

110bcd 4 bolt (Shimano 8000, 8100, 9100, 9200 – including Shimano power options)

107bcd 4 bolt (SRAM AXS Quarq and non Quarq - not SRAM Direct Mount)

Please note Aten road chainrings are not compatible with Shimano cranksets that are fitted with aftermarket power meter pods (eg. 4iiii, Stages). Please also check chainstay clearance for larger sizes.

INSTALLATION

When installing Aten 2x rings, please set your front derailleur height when the chainring teeth are at their highest point. Chainring bolts should be tightened to 4-5Nm.

Please note that a front mech spacer may be required on some bikes for the larger sizes (58/44) to raise the front mech higher than the mounting bracket allows as standard, which can be purchased HERE.

WHAT'S INCLUDED

1x Aten aluminium/carbon outer chainring

1x Aten aluminium inner chainring

1x set of M5 allen key double chainring bolts (optional)

1x set of Aten bolt covers (optional)

European Union registered design no. 008931950-0002

United Kingdom registered design no. 6200835