KCNC K5 Rectangular Road Rings

They call them "rectangular" chainrings, but they are an extreme a-symetric ring!!  They are certainly not round!!  Designed to reduce the effect of the "dead spot" as the crank arms come round top dead centre (12 and 6  o'clock).

They can increase power, they can increase efficiency, they can make you pedal smoother!

KCNC use what they call an ovality ratio of 1.225  on the K5 pattern rings, with a bi-radial symmetry offset by 88.3 degrees.

• 110bcd 39T and 53T Blade pattern rings
• Machined from Al7075 alloy
• outer ring is 6mm thick to improve stiffness
• inner ring is 5mm thick to save weight
• ramped with 10 pick up pins for smooth up shifts
• weight : 39T 59g     53T  146g

Note : because of the out-of-round shape the bcd is 110mm for 39T and 53T rings