New advanced carbon layup for improved performance Differing number and location of pins and shifting zones according to chainring combination ensures optimum location of shift zones during pedal stroke Available in multiple chainring combinations and crank arm lengths Tooth design specific to chainring combination Unidirectional carbon finish 172.5x50/34 UT CRBN 123x4B 2x12UPC/EAN/GTIN: 8053340453885