For sale is a used Giant Contact SL threadless stem, 70mm x 6 degree rise. This stem is compatible with the oversized Overdrive 1 1/4” diameter steerer tubes Giant used in the past on some bikes.

There is a removable shim in the steerer tube clamp that also makes it compatible with standard 1 1/8” diameter forks.

Handlebar clamp: 31.8mm diameter