ABSOLUTE BLACK XX1 SHIM 30T 104/64BCD NARROW-WIDE image About 10% lighter than SM-RT53

About 10% lighter than SM-RT53

It evolves from the SmartEVO blend of three polymers with 'smart' characteristics

SHIMANO's CENTER LOCK mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design

sensor pairing - ANT+

It is composed of a 60tpi full double-ply carcass together with a rubber insert in the bead area and an additional layer of fabric which stabilizes the sidewall of the tyre

ABSOLUTE BLACK XX1 SHIM 30T 104/64BCD NARROW-WIDE image About 10% lighter than SM-RT53absoluteBLACK is dedicated to producing the world's finest oval chainrings and were the first to crack the code to discover the correct shape and 'clocking' to make an oval chainring work. They learned how to maximize the part of the stroke where power is produced and minimize resistance where it isn't which has the effect of smoothing out the delivery of power throughout the pedal stroke and improving efficiency. Many other brands have followed suit