, T47 Inboard ABEC-3, Threaded Cups, T47, 86-121mm, 30mm

The Wheels Manufacturing T47 Inboard bottom bracket threads directly into a T47 frame shell and carries cranks with a 30 mm spindle. The bearings sit inboard, inside the shell rather than outside it, and the same cups cover a wide span of frames with shell widths from 68 mm to 132 mm.

Machined aluminum cups thread together into the shell, with the drive side cup taking a left-hand thread and the non-drive side a right-hand thread, the same convention as a standard BSA unit. ABEC-3 cartridge bearings can be serviced or replaced. A sleeve spans the gap between the cups to keep grit and internal cable routing away from the spindle.

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