New model for 2010. Strong and crack proof super thick axle. Because of the ISIS bb axle size and small euro bb shell used on all MTB frames the bb sealed bearings are always tiny & weak. No matter if 2, 3 or 4 of sealed bearings they will die sooner or later. We were tired of broken bottom bracket bearings and instead of using small and weak sealed bearings we decided to offer a new type of bb which act itself as a big sealed bearing. The result is a durability way greater than other bottom bearings with 4 sealed bearings! Aluminum cups for weight reduction.