180mm/68mm shelll. Isis. Very smooth still. Sold out cranks without bottom bracket, and isis wont’ work with my srms. $70 (offers considered) (finding it online for $250 new right now). Here’s the info:
**Zipp 185 Bottom Bracket ** The 185 BB is the result of years of research into making a better BB, and after careful work with our bearing supplier, we feel that we have created the ultimate ISIS compatible BB. The 185 BB uses 6A1/4V titanium and a proprietary heat treating process after machining to create a super light spindle, which rides inside two twin-row bearings. Titanium allows the spindle to be the standard 21.5mm diameter within the bearings, but nearly 23mm diameter between the bearings, thus making for a stiffer spindle than lightweight steel spindles that use a reduced diameter between the bearings. List Price Your Price Qty **$250.00 ** **$250.00 **