SHIMANO BBES300 BSA octalink bottom bracket shell 126/73

SHIMANO BB-ES300 126mm bicycle bottom bracket.

It is the basic (and currently the only) model of Shimano bottom brackets with an Octalink mount dedicated to MTB and trekking bikes. Used in Shimano ALIVO, ACERA, ALTUS groups, as well as in older models of crank mechanisms, also in higher groups. The Octalink technology, thanks to the axle with a large tube cross-section, provides much greater stiffness than traditional square bottom brackets, thus ensuring better energy transfer to propel the bicycle.

Specification:

• Octalink crank axle
• Adapted to support joints with a width of 73 mm
• Axle length: 126 mm
• Standard BSA (English) 1.37 "x 24T thread
• Works with M15 crank mounting bolts
• Average weight: 290 g
• The set does not include bolts securing the crank arms to the bottom bracket

Technologies used:

OCTALINK bottom bracket mount

• Comparing the OCTALINK power transmission to conventional square lugs, the 8-spline OCTALINK, which combines the bottom bracket shell and crankset, increases the stiffness of the overall structure. This is all thanks to the use of a hollow axle and a more effective connection of the crank arms with the bottom bracket axle. Bicycle crank mounting system, created and patented by Shimano. It is the successor of the square crank mounting system. Its shape, i.e. a round shaft with eight protrusions (this is where the name of the system comes from: octa or eight), can withstand and dissipate the forces that this place is subjected to better, in addition, this connection is much stiffer than the previous solution.