MTB stems for TBD Bikes

In spring 2025 I designed a set of parts for TBD Bikes: two MTB stems, two BMX stems, a 3-piece crankset in SRAM 3-bolt and Shimano direct-mount versions, the same crank design for ISIS-drive e-bikes with Bosch motors, and pedals. This page is the two MTB stems. The rest of the set is on the BMX stem, crank arm and pedal pages. We were still finishing the designs then, and the plan was for every part sold to help fund Dirt Jumper V2.

The video shows my CAD process for the MTB stem, then the crank arms. I wanted a simple design that's strong and easy to manufacture, and the plan was to take the parts from CAD models to ride-ready parts.

I printed the trapezoid-body stem: two bodies, a four-bolt faceplate and two clamp halves. The clip shows them up close with other parts I printed for the set. The last two images are the other stem, with side windows, in Fusion 360. Most of my printed MTB and BMX stems were SLS PA12, and some were resin or FDM. I didn't ride any of them.