A bottom bracket is under a great amount of pressure and force, this component assists in transmitting your power into forward movement. Bottom brackets have changed over the years evolving and become more efficient for transferring power from the body to the bike. As well as longer lasting due to sealed bearing technology.
Choosing a bottom bracket is based upon your chainset and frame type. External bearings and pressfit bearings are becoming standard fitment on bicycles. Generally, the higher up a brand hierarchy you go, the better the bearings, sealing and material quality will become. Sealed bearing bottom brackets are pretty much standard these days due to the maintenance free benefits.
Bicycle bottom brackets connect the cranks to the bike and allow the crank arms to rotate. There are various sizes of bottom bracket shell on the market, so compatibility needs to be checked. The three most common frame bottom bracket shell widths are 68mm (English threaded road and mtb), 70mm (Italian threaded road) and 73mm (British threaded mtb). There are also many axle shapes and styles, from JIS or ISO square tapers through to the round splined axles such as ISIS or Octalink and then there is the new external cup systems which have the axle built into the crank arms. Some frames are now using the new BB30 system which uses bearings pushed directly into the frame and removes the needs for cups to be threaded into the frame.
Wiggle Ltd. 1000 Lakeside, Suite 310, Third Floor N E Wing, Portsmouth, Hampshire, PO6 3EN, United Kingdom /
Company No: 2667809 /
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