Bottom bracket height
The bottom bracket height is a very important but often insufficiently considered dimension in bike design. It determines the depth at which the rider is integrated into the bike in order to achieve a maximum of riding safety and good handling on descents and in corners. It also has to offer the rider enough ground clearance on a trail so that no contact occurs with the surface (e.g. when riding over roots). The bottom bracket height always has to be considered in combination with the tyres used, their diameter, the tyre pressure and the sag setting on the shock absorber. Due to the new wheel sizes such as 27.5” and 29”, the bottom bracket always lies above the wheel axles (see above for drop), which noticeably improves the handling of the bike.