Are all BB30 bottom brackets the same?

Are all BB30 bottom brackets the same?

DUB is compatible with BSA threaded, PF86, PF92, BB30 (73mm shell) and PF30 (73mm shell) bottom brackets and cranksets are completely interchangeable between the different standards.

What type of bottom bracket is BB30?

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.

What’s the difference between BB30 and PF30?

Both standards are designed to use a crank arm spindle with a 30mm diameter (hence the ’30’ in the name), but with a BB30 set up the bearings sit directly in the frame, and with a PF30 the bearings are housed in a nylon or aluminum retainer that gets pressed into the frame.

How can you tell if bottom bracket is BB30 or BB30?

Another way to identify a BB30 bottom bracket besides looking at the size is the fact that you don’t see bearing shells because the bearings are pressed into the frame. On most frames with a BB30 Bottom Bracket you’ll also find a sticker with ‘BB30’. Which cranks fit onto a BB30 bottom bracket?

What’s the difference between BB86 and PF30 bottom brackets?

Besides BB86/92 Press Fit there is also Press Fit 30. This is based on the BB30 Bottom Bracket. The quick creaking common with BB30 is not a problem with PF30 because the bearing shells balance play a lot better. To provide space for the plastic bearing shells, PF30 bottom brackets have a diameter of 46mm (compared to 42mm for a BB30).

What’s the difference between BB 30 and BB30?

The term BB30 was an early term in the history of this standard and refers to the 30mm diameter of the spindle used at that time. However, bottom bracket bearings are available in this standard for 28.99mm, 24mm and 22/24mm spindle systems. The only commonality amongst these different terms is the 42mm nominal press fit dimension.

What should the diameter of a bottom bracket be?

The spindle always has a diameter of 30mm. This ensures a low weight and lots of stiffness. The bearings in the bottom bracket shells are pressed directly into the carbon or aluminum of the bottom bracket. This is a precision task though. Even with a slight deviation the cranks won’t turn smoothly.