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PRO Tharsis Trail Stem

Average User Rating: (OK)
PRO Tharsis Trail Stem
 PRO Tharsis Trail Stem  PRO Tharsis Trail Stem  PRO Tharsis Trail Stem  PRO Tharsis Trail Stem  PRO Tharsis Trail Stem
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Not Enduro Capable

Rating: Featured Member Review
The Good:

Gives one of the cleanest, easiest Di2 battery mounting options

The Bad:

BTR expander not secure enough to stand up to all-mountain or enduro use

Overall Review:

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.


Product PRO Tharsis Trail Stem
Riding Type Enduro / All-Mountain, Trail
Material 3D forged and CNC machined AL-7075
Clamp Diameter 31.8mm
  • 35mm
  • 45mm
  • 55mm
  • 65mm
Steer Diameter 1 1/8"
Colors Black
  • 0 lb 3.4 oz (95 g)
  • 0 lb 4.6 oz (129 g)
Miscellaneous Headlock system for a secure front clamp fixation
Allows for internal Di2 cable routing
The BTR expander replaces the typical star nut system for adjusting headset tension and opens up space for mounting a Shimano Di2 battery inside the fork steerer
Price $149.99
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