First we’ll start with the bottom brackets. For a press fit bottom bracket you will need a bearing press. Lightly grease the frame with a carbon safe grease. Taking note of the inner sleeve mark-ings (left and right) and push one side in. Now push the other side in.
For a threaded bottom bracket, lightly grease the bottom bracket threads. Thread the cups in, again taking note of which side is drive and non-drive (it is marked on the outside to the bottom bracket cups). Tighten up the cups to 50Nm.
Grab the left hand crank arm and make sure the bearing preload is wound all the way into the crank arm. Slide the crankset through the bottom bracket.
You would have noticed that your bottom bracket came with some spacers. You will need to work out what spacers you require via the SRAM instructions.
For this press fit setup we will have to use a 2mm one.
For our threaded bottom bracket we will have to use 4mm one.
Lightly grease the splines and thread on the right hand crank arm.
Tightened the crank bolt to 54Nm.
Gently give the right hand crank arm a tap. This will slide any slack in the system to the non drive side.
You should now see a small gap between the bearing preload and the bottom bracket.
Tighten the bearing preload to remove this gap. Do it just enough that it takes up the gap and still spins freely.
Tighten up the pinch bolt using a 2mm Allen key. You only need to tighten it so the top edges touch.
Pop you pedals on remembering to use the pedal washers.
Words: Joe Dodd Photos: Chris Herron
Today in the Workshop we are going to talk you through how to install the new Sram DUB crank standard. SRAM have come up with a spindle and bottom bracket that can fit into any bottom bracket standard. Press fit, BSA, BB30, PressFit 30 – they have the options.
Click through the gallery for the workshop sequence and complete the instructions in the captions.
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