Description

absoluteBLACK Oval chainrings for FSA ABS (Asymmetrical Bolt System) cranks like Gossamer, SL-K, K-Force. This model fits all 4 and 5 bolt design cranks. 4&5 bolt cranks are identical except the one hidden bolt behind the crank arm in 5 bolt design which is not needed. Some of the finest FSA compatible chainrings on the market in terms of shifting, stiffness, smoothness of pedaling and manufacturing quality.

• All FSA ABS (Asymmetrical Bolt System) cranks like Gossamer, SL-K, K-Force, K-Force Light
• Both 4 and 5 bolt versions
• Di2 compatible

Feature

• Designed using 3D CAD software, CNC machined, anodized
• Long-lasting construction (5 mm)
• Smoother, more efficient pedaling action, helps you climb easier and faster
• Reduced stress on knees
• 6 point ramp and recess shifting design
• Excellent weight to strength ratio
• Reduces chainring/cog shifts by at least 15 %
• Ovality and timing (108-110.5°) optimised for each size separately (TDC technology, top dead center)

Technology

Why absoluteBLACK oval chainrings work

Oval rings work with the natural human physiology. Oval chainrings maximise the part of the stroke where power is produced and minimise resistance where it isn't. As a direct consequence, oval rings enhance a cyclist's ability to spin with a smoother power delivery and feel easier on legs while climbing.

You will actually feel your pedal stroke to be more " round" with an oval chainring than with a round chainring.

Why using oval chainrings matters

In comparison to round chainrings, when using oval chainrings, human legs utilise more muscle groups - but each of them to lesser degree. The overall load from pedalling an oval chainring is spread over a greater muscle mass, which reduces the peak loads on knee joints.
This has three key benefits: firstly, it gives you the feeling of fresher and more relaxed legs. Secondly, it allows you to achieve higher average speed riding uphill. Thirdly, spreading the pedalling load over more muscles reduces the risk of cramp, even when riding hard. This means your overall enjoyment of the ride is enhanced. On MTB side in addition rear tyre traction improves greatly on loose and slippery terrain when using oval. Climbing becomes much easier in demanding terrain.

Specification

• Application: Road
• Mount: 110 mm bolt circle diameter, 4-arm asymmetrical
• Teeth: 34 t, 36 t, 38 t, 39 t, 50 t, 52 t, 53 t
• Gearing: 2x10-speed, 2x11-speed, 2x12-speed
• Type: oval, 3.5 % (34 t), 11.4 % (36 - 39 t), 10 - 11.2 % (50 - 53 t)