Cluster 02 · Bottom bracket

Bottom bracket

The full bottom bracket cluster, linked. Start with the pillar to identify yours, then drop to your bike's exact standard: BSA, BB30, PF30, BB86/92, T47, plus the comparisons and creak diagnosis.

What bottom bracket does my bike use?Start here. The two families (threaded and press-fit), the shortcut by bike type and year, and how to confirm it by measuring. BSA · threadedThe classic threaded standard (1.37″ × 24t). Why it rarely creaks and how to spot it. BB30Press-fit, 30 mm spindle, 42 mm shell. The standard that popularized press-fit — and its noisy reputation. PF30BB30's plastic-cup cousin, 46 mm shell. How it differs and when it creaks. BB86 / BB92Shimano's narrow press-fit (86.5 road / 91.5 MTB). The most common on modern brand bikes. T47Threaded but with a wide 47 mm shell. The standard replacing press-fit on high-end bikes. Press-fitWhat “press-fit” means, why the industry adopted it, and why it creaks the most. Hollowtech II · ShimanoShimano's 24 mm spindle crank system. Which bottom bracket it needs and which shells it fits. DUB · SRAMSRAM's 28.99 mm spindle that fits nearly every shell. What it solves and what it confuses. BB30 vs PF30They look alike and get confused. The shell difference (42 vs 46 mm) and which one you have. BSA vs T47Classic threaded vs modern threaded. Why T47 exists and when it's worth it. Which crank fits?Your shell rules. Which crank spindles (24, 28.99, 30 mm) fit each standard. Why does my bottom bracket creak?The workshop's #1 noise. Real causes and how to silence it without replacing the part.