What is BB shell width?

The width of a BB30 bottom bracket is 68mm or 73mm. On road bikes, it’s always 68mm. With mountain bikes, 68mm is most common too, but sometimes the wider version with 73mm width can be found. The diameter of the bottom bracket is 41.96mm, and the bottom bracket bearings are always pressed into the frame separately.

How do I measure my BB shell?

With both crank arms attached to the spindle, measure the distance across the spindle between the crank arms. This is the space that your BB shell plus bottom bracket has to fit into.

How is BB spindle length measured?

In order to measure the spindle length, you need to remove the cranks and then measure the spindle length. There is no guarantee that the spindle is symmetric or the width of the cranks on both sides is the same. In any case, you’ll need to pull off the cranks to replace them.

How big is the inside of a BB shell?

The main dimension with this standard is the inside diameter of the BB shell: 41mm. There are other standards that also have a 41mm ID: PF24, PF41, PF107, PF121, PF132 Common Shell Widths: 86.5mm (road) or 91.5mm (mountain)

What is the diameter of a BB30 bottom bracket?

BB30 bottom brackets have been used frequently since 2006. 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.

How big is the BB shell on an Italian road bike?

Generally Italian road frames have 70mm wide BB shells and British and French use 68mm shells. Track frames can use 65mm shell to pull the arms in a little closer to the center line of the frame to give the pedals a little more clearance on a banked track. English: 1.370″ x 24 TPI.

How big is the bottom bracket of a BB86 wheel?

The BB86 bottom bracket shell is 86.5mm wide and the BB92 shell is 91.5mm wide. Both have an inside diameter of 41mm.

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