Thomson X4 Mtn Stem (31.8) 0d x 90mm Black MFPN=80-90916 DUB-PWR spindle-based unit measures left

DUB-PWR spindle-based unit measures left side power to calculate total watts

Shift from the big to small chainrings or vice versa whenever you like while minimizing the risk of a dropped chain

Low profile push-button open/closure system

DI2 11-speed and FC-M8150 serration

color black weight 42g

Thomson X4 Mtn Stem (31.8) 0d x 90mm Black MFPN=80-90916 DUB-PWR spindle-based unit measures leftCNC machined from 1 piece 7000 series aluminum (no welds) X4 dress up kits can add color to any 31. 8mm X4 stem, available separately use TP105* 48mm wide 4 bolt faceplate. 147g (70mm) Model X4 Steerer Dia. 1 1 8" Bar Dia. 31. 8mm Rise 0 Deg Length 90mm Color Black