ABSOLUTE BLACK XX1 SHIM 30T 104/64BCD NARROW-WIDE image Reduces stress on knees and

Reduces stress on knees and helps to maintain your legs fresher for longer

About 10% lighter than SM-RT53

The premium-grade formula will leave any matt surface with a streak and gloss-free protective finish that reduces dirt adhesion

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

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

ABSOLUTE BLACK XX1 SHIM 30T 104/64BCD NARROW-WIDE image Reduces stress on knees andabsoluteBLACK 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