The most obvious category of specialist stems is the direct mount versions that bolt directly onto the top crown of a double crown DH fork. There are some other outliers though, like Syntace’s cunning and reliable angle-adjustable stems. Others include optional mounts for cameras/lights in the front plate. The OneUp Components stem even works as the anchor block for preloading the steering bearings, leaving the inside of the fork steerer clear to mount their hidden tool system inside.