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Questions & Answers (1) Q & A
- HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameters for increased stiffness and efficiency
- HollowTech II integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durability
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Questions & Answers (1)
Replacement For Ultegra Fc6600 Outboard Cup Bb?
13 Jun 2015
My Ultegra bb SM_FC6600 ( english 68mm ) has seized up. What replacement should I get?

As the dimensions haven't changed in any way between the FC-6600 chainset and the FC-6800 chainset in regards to how they fit with the bottom bracket so this one you are looking at is a suitable replacement.