Ultegra SL's version of the Dura-Ace type HollowTech II oversize, outboard bearing bottom bracket cupset. External placement provides for larger and more durable bearings. Ultegra SL Ice Grey finish. Compatible with all Shimano brand HollowTech II type cranksets. Use the Park BBT-9 (#2443) to install cups and adjust cranks or the BBT-19 (#2446) to install cups only.