Yes, as stated above, the 85.5mm inboard/internal T47i BB is exclusive to Trek, but I've never seen a thirdparty BB from any brand that's exclusive to that format. The 1mm difference is easily addressed and several BB I've seen for T47 inboard/internal are adaptable to various widths, some, like Token's models, fit 85.5, 86.5 and 91.5mm.