FC-R7100 An attractive aluminum crank with hollow arms for lightweight, rigidity, and durability The newly designed crank arms offer an optimized balance between lightweight and efficiency. The crank, formed with hollow aluminum technology, is anodized with a beautiful gloss black anodized finish, giving it a luxurious look. The resin ribs on the back of the chainrings are SHIMANO 105's unique structural design that achieves both thorough weight reduction and crisp shifting performance. FEATURES ~Optimal balance of stiffness, strength, weight and rotational performance ~HOLLOWTECH II structure cuts weight yet maintains strength for better power transfer ~Crank arm length: 160, 165, 170, 172.5, 175 mm ~Gear combination: 50-34T, 52-36T ~Q-factor: 148 mm PRODUCT SPECIFICATIONS MODEL NO FC-R7100 SERIES SHIMANO 105 R7100 Di2 Series Color Black Average weight 754 (50-34T) Rear speeds 12 Compatible chain HG 12-speed Chain line (mm) 44.5 P.C.D. (mm) 110 Spider/gear arms 4 Chainring combination 50-34T Q-factor (mm) 148 Crank arm length (mm)|170 ✔ Crank arm length (mm)|172.5 ✔ Optional chain guard|Without chain/bash guard ✔ HOLLOWTECH II ✔ HOLLOWTECH crank arm ✔ Compatible bottom bracket type|Outboard ✔ Recommended bottom bracket|Threaded (normal) SM-BBR60 Recommended bottom bracket|Press-Fit SM-BB72-41B Threaded bottom bracket shell width (mm)|68 ✔ Threaded bottom bracket shell width (mm)|70 ✔ Crank fixing screw included ✔ Can Whatsapp / Call . https://wa.me/60126960321 Vince . https://wa.me/60126105929 Shop . office 03-8060 8967 Operation Hour Monday to Saturday (10.30AM TO 7PM) SANTA CRUZ (VK CYCLES PUCHONG) Map - https://goo.gl/maps/8y79tAyzkEE2 (LOCATION) No 39, Jalan BP 7/2 , Bandar Bukit Puchong, 47100, Selangor , Puchong Facebook - https://www.facebook.com/SpecialistRepairBicycles/ Instagram - VK CYCLES PUCHONG Buy on shopee: VK CYCLES PUCHONG https://shopee.com.my/product/78112047/22355021055/ Buy on LAZADA: VK CYCLES PUCHONG https://www.lazada.com.my/products/i3796158595.html?spm=a1zawi.24863640.table_online_product.1.4c2d4edfaGT2Pe Buy on Tiktok: VK CYCLES PUCHONG https://shop.tiktok.com/view/product/1729486235945567414?region=MY&locale=en