THM creates 78g Tibia stem

THM claims 'world's best stiffness-to-weight ratio' on new stem

While a sometimes forgotten notion, lightweight means little without proper strength. A very shallow search on the internet can reveal all sorts of crazy lightweight parts and bike builds. But are they even rideable? Or do they ride well? 

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German carbon manufacturer THM has put a few unique spins on the traditional stem to come up with what it claims is the “world’s best stiffness-to-weight ratio” stem, the 78-gram (10cm length) Tibia.  

The face plate is an all carbon piece
The face plate is an all carbon piece
Russell Eich / Immediate Media

Nuts, not bolts

To achieve the feathery weight, yet retain the stiffness THM claims, the company flipped the stem’s face plate mounting system around. 

That means instead of threading bolts through the face plate into the stem body, the stem bolts protrude from the stem itself. 

The bolts are independently adjustable to minimize stress
The bolts are independently adjustable to minimize stress
Russell Eich / Immediate Media

The bolts are independently adjustable so as the face plate and bars are snugged up, the bolt is free to shift and orient itself in a place of least stress. 

The T15 Torx stem nuts have a tapered end for simplified centering in the face plate holes as well. 

Steerer clamp

Like the stem/bar interface, the steerer clamp is also designed to minimize stress. The bolts are threaded through a shaft that is allowed to rotate to compensate for the tightening deformation. 
The steerer clamp is designed to relieve stress as well
The steerer clamp is designed to relieve stress as well
Russell Eich / Immediate Media

Weight and availability 

The 100mm Tibia stem they had available has a claimed weight of 78g and should be available in July.

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Additional lengths of 80mm, 110mm, and 120mm did not have published weights and are due in September.