ThreadFit™ T47 30i will fit 68mm, 73mm, 83mm, 86mm, and 92mm shell widths with 30mm spindles. All our bottom brackets come with King's legendary, angular-contact bearings, either steel or ceramic. These are the best bearings in the industry, and actually get faster over time, as their contact surfaces wear.You want this bottom bracket because it offers super low drag. You want this bottom bracket, because it can be opened, cleaned and repacked for years of faithful service. You want this bottom bracket, because you don't want to think an awful lot about your bottom bracket.Features:- Legendary made-in-house bearings- Ceramic bearing upgrade available- Threaded security with PressFit 30 shell stiffness- A Fit Kit is required for use and included in the purchase price- Uses Chris King bottom bracket cup tool for installation