ZwiftSteering

For use with an indoor trainer and Zwift and their new steering feature. It allows the front wheel to freely pivot at an angle and prevent "walking" the trainer forward.

It is designed for a 700cm x 25mm or less. The wheel gap is actually 28mm so you may be able to squeeze a 28mm in there. The angle is 20 degrees which should be close to the angle of the stem.

Update: As I've used it, I've had an issue with it sliding out from the front tire even with non-slip applied to the base. The solution was to get a non-slip rug pad, put one end under the trainer and literally screw the base of the pivot in place. It works a treat and can be taken up if needed.