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In the spirit of Zero Constraints, the engineers decided that conventional bottom bracket design had no place on the new Madone.
That is where the Trek’s new Precision Fit Sockets come in; the bottom bracket bearings sit directly into the “sockets” in the frame which are essentially integrated sealed bearing races built into the frame.
The current standard outboard bottom bracket bearings are scrapped and the extra width is absorbed into the frame design itself.
There is no need for Loctite or any other retaining method.
The carbon technology is so sophisticated that testing indicates that the bearings will wear out with no adverse effects to the Precision Fit Sockets.
The resulting new structure is 90mm wide with no impact on Q factor.
The new format is compatible with two piece cranks from FSA, Bontrager, Shimano, SRAM and Campagnolo.
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