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Crank/BB Spec


Click on the links below to download (pdf format).

More Information

My cranks make a creaking sound

In most cases, creaking cranks are caused by a loose chainring bolt. This allows the chainring to move slightly with every pedal stroke. Also make sure your crank bolts are tight, and your bottom bracket cups are tight in the frame.

If those three areas are not causing the creak, then it probably does not come from the cranks. Creaks on bikes can be notoriously difficult to diagnose, because the frame acts like a sound board. Also check your seatpost’s bolts, push on your saddle on either side to make sure it isn’t causing the creak, and make sure your frame isn’t cracked somewhere – all of these can sound like a creaking crank.

Not sure which bottom bracket you need?

Read our blog post “Bottom Brackets Demystified”.

Didn’t find the answer you were looking for?

Write to and we’ll answer your question, usually within 2–3 days.