Road Bike Bottom Bracket Standards

Dub durable unifying bottom bracket may sound like a new standard but really it s a new axle diameter specification for mountain bike cranks in 2019 sram also started rolling out dub.

Road bike bottom bracket standards. The world of bottom bracket standards is about as complicated as it gets in cycling. Bikeradar s complete guide to bottom brackets. It s designed to be used with a 24mm axle shimano long shunning the temptation to use a 30mm axle like its major rivals. To accurately determine the bottom bracket standard in your frame it is best that you remove your crankset and any installed bottom bracket cups or bearings.

Shimano developed its press fit standard using 41mm diameter bearing cups with an 86 5mm wide bottom bracket shell for the road and 89 5 or 92mm for mountain bike. Everything you wanted to know but were afraid to ask we run through the exciting world of bottom bracket standards so you ll know your pf30 from your bb386evo. Simon explains all in this. Over the years the bicycle industry has created numerous bottom bracket standards.

Bottom bracket standards and terminology. Then measure both the inner diameter and width of your frame s bottom bracket shell. Finding the correct bottom bracket for your frame can be challenging. The bottom bracket is a bicycle component used to connect a bicycle s crankset to its frame allowing it to rotate independently of the frame itself.