The BB30 bottom bracket shell is typically 68mm (road) or 73mm (mtb) wide with an inside diameter of 42mm. Originally the BB30 system was designed to use 30mm diameter crank spindles. However, frame's with BB30 shells can be used many other sized crank spindles.

To accurately determine the bottom bracket standard in your frame, it is best that you remove your crankset, and any installed bottom bracket cups or bearings. Then measure both the inner diameter and width of your frame's bottom bracket shell. The chart below lists most of the current bottom bracket standards found on today's frames.

SRAM DUB BB30 Bottom Bracket 42mm x 68/73mm. The SRAM DUB bottom bracket series has a simple job- to connect crankarms and protect the smooth long-lasting application of power to the drivetrain. SRAM engineered the oversized DUB spindle to work across every bottom bracket standard simplifying crankarm compatibility.Gut

BB30 fits into a 42mm shell—a shell with an internal diameter of 42mm. PF30 bearings fit into bb shells with an internal diameter of 46mm. As for the sealed bearings themselves they are identified as 6806 bearings.

2018年1月23日 · BB30 73mm ; Gutter Seal Technology drastically improves sealing against the elements ; Sealed cartridge bearings ; One oversized spindle to work across every bottom bracket standard ; Significantly lighter than GXP system ›

The BB30 bottom bracket allows you to pair 30mm spindle cranks to 42mm inner diameter bottom bracket shells. Cannondale pioneered this standard along with specially designed cranks and many have found the benefits to them. Road versions have a 68mm width, MTB has 73mm.

2016年12月22日 · bb30 Shell width: 68 mm for road, 73 mm for MTB. Shell inner diameter (Shell ID from now on): 42 mm. BB30 bearings have the same, matching outer diameter of 42 mm.

BB30 uses a 42mm x 68mm Shell and was originally developed by Cannondale as an open standard, other manufacturers soon adopted this standard. Hambini bottom brackets are available to interface this frame type to Shimano and SRAM cranksets.