PRO Tharsis Trail Stem

(discontinued)

I used this stem in conjunction with a PRO Tharsis Trail Di2 handlebar and while they're both super attractive and light, and I have no complaints about the bar, the stem being used as intended with a Di2 battery in the steerer tube doesn't stand up to the rigors of aggressive all-mountain or enduro riding. No matter how tight the stem bolts were tightened, and even with the addition of anti-slip paste, I was unable to prevent the stem from slipping up the steerer tube causing noticeable loosening of the headset.

Eventually I sold the Di2 kit and am still using this stem and handlebar with a standard star nut and top cap for which it works just fine (after removing the rotating collet from the bottom) but the entire reason you'd buy this stem is for use with Di2.