absoluteBLACK Premium Oval chainrings for FSA ABS (asymmetric bolt spacing) 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.
These are finest FSA compatible chainrings on the market in terms of shifting, stiffness, smoothness of pedalling and manufacturing quality.
10/11/12spd compatible. Di2 Compatible. Made in EU

Size: (Mass +/-1g): 34T (32g), 36T (33g), 38T (38g), 39T (41g), 50T (115g), 52T (132g), 53T(134g)

BOLTS
For Gossamer - use original FSA bolts and spacers
For SL-K - use original FSA Bolt Covers and bolts
For K-Force - purchase absoluteBLACK bolt covers (necessary!)
Ovality: Optimised to each size separately. 34T- 3.5% ; 36T, 38T, 39T- 11.4%, 50/52/53T - 10-11.2% ; Timing of 108 -110.5° after TDC (top dead centre) - Ideal for road climbing. Patent Pending

IMPORTANT:

• Ramps on big rings are specially configured for combinations: 50/34, 52/36, 52/38, 53/39T
  
• If you wish to use other configuration it will also work, but shifting will be slower and may require more "adjustments" of front derailleur to be acceptable. Also remember that front derailleur can only accept max 16T difference between 2 chainrings - this is how Shimano and SRAM designed them.
  

Advantages of Absolute Black Road Oval chainrings:

• One of a kind special oval shape that helps you climb easier and faster (Patent Pending)
  
• Over 15% stiffer than Rotor Qrings due to thicker, 5mm construction
  
• Bespoke Absolute Black 6 point ramp and recess shifting design shifts better than any other brand and model of oval chainring
  
• Finest design that provides excellent strength to weight ratio
  
• You will not "feel" the oval shape while pedalling
  
• Your pedalling action will feel smoother
  
• Helps reduce stress on knees and helping your legs remain fresher for longer
  
• You will be able to maintain better cadence while climbing
  
• Reduces possibility of leg cramps
  
• You will reduce chainring/cog shifts by at least 15%

All FSA ABS (asymmetric bolt spacing) cranks like Gossamer, SL-K, K-Force, K-Force Light. Both 4 and 5 bolt versions. One model fits them all. Di2 Compatible. 10 / 11 / 12spd compatible. ABS cranks only.