The hidden number that decides how a bike corners.
Monsoon Cycles, Colorado Springs · Updated August 21, 2026
Bottom bracket drop is how far the crank spindle sits below the wheel axles. Not height above the ground; drop below the axle line. It is the number builders argue about, because the marketing sheet rarely prints it.
More drop (70mm and up on road) puts your weight lower between the wheels. The bike corners like it is on rails and feels calm at speed, which is why stage racing bikes and our Italian Stage Racer preset run deep drop. The cost is pedal clearance: lean a deep-drop bike hard through a corner while pedaling and the inside pedal finds the pavement.
Less drop (under 60mm) buys crank clearance for exactly the bikes that need it: crit bikes that pedal through corners, track bikes on steep banking, mountain bikes clearing rocks.
Roughly: 55 to 60mm crit, 65 to 72mm road and touring, less for track. Our presets carry real values; open the Frame Lab and compare the Criterium Special to the tourer.