Token TK878EX Integrated Premium Sealed 68mm Bottom Bracket - Black Category_Tubeless Rim Tape The third port is for

The third port is for riders who seek the redundancy of Shimano's 12-speed Di2 wired option

the DURA-ACE is still lightweight at 54 grams

Carogna is designed and has been tested to perform flawlessly on any rim material (aluminum

Seating area has cushions of silicone gel with different thicknesses

Large X-SYNC pulleys for increased durability and efficiency

Token TK878EX Integrated Premium Sealed 68mm Bottom Bracket - Black Category_Tubeless Rim Tape The third port is forTK878 TOKENs 878 external bottom bracket is an extremely high quality bottom bracket that was designed for use with all Shimano and SRAM GXP cranksets (with additional adapters). The bottom bracket is precision made for durability and smoothness and did we mention it also looks pretty fantastic! We designed this bottom bracket so the bearings rest on the axle of the crankset to provide a straight load to the bearings, which results in a longer life