The progressive minds at SRAM saw the opportunity to make a better press fit system by combing the best BB30 technology into one captivating package, so they did just that. Their Press Fit 30 features an integrated seal, pre-assembled into the cups, to extend bearing life. The key difference with Press Fit 30 is how the bearings are fitted into the frame. Bearings are housed in nylon cups that you press into the frame's bottom bracket shell. Compatible with 30mm cranks, the Press Fit 30 is an excellent bottom bracket that's built to last.