If so, the distance from the outside of one cup to the outside of the other will be 86.5mm, and the diameter of the cromo axle is 24mm.īut, on the other hand, you could have a BB30 (road BB30) or a PF30 bottom bracket where the bearings sit inside the bottom bracket shell (which is still 68mm wide). There’s a good chance that if you’ve bought your bike in the last few years, you have a bottom bracket that is screwed into the frame with the cups sitting externally – such as an FSA MegaExo system. Okay, so if by any remote chance you’re confused by the current state of affairs, here’s where we’re currently at with bottom brackets.Ĭhances are, the bottom bracket shell on your road bike is 68mm wide. ![]() Thankfully, the new BB386EVO system works with most (but not all) current bottom bracket standards and could actually make things easier. Great, because the world is crying out for just one more. We know what you’re thinking: another new system. FSA – Full Speed Ahead, if you want to be formal about it – have developed a new crank, bottom bracket and frame system that they reckon will become the standard for high-end frame and drivetrain component design.
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