Our original post on the DM3 F69 single leg carbon fiber and steel fork left a few questions, so we followed up.
To recap, it’s a steel single legged fork that works with both 26″ and 29er wheels via different axle slots with a sliding carbon fiber and alloy shaft inside the leg to adjust the height. Shown here is a much more polished version, but creator Dimitri Robin is quick to point out it’s still a test unit. After they finish their own testing on both 26″ and 29er mountain bikes on the trails and roads, they’ll go after CEN certification.
In the meantime, he’s given us a bit more of a breakdown on its construction…
Inside the steel tube is a carbon fiber tube to add rigidity. Attached to that at the bottom is a 7075 T6 aluminum tube where the axle mounts.
The axle is the same alloy and is 20mm in diameter, using an M8 bolt to attach and hold it in place in the fork. The axle is held by a supported hole in the steel outer tube and counter-bored in the internal alloy tube.