SW-Motech GPS mount kit for head tube with T-LockGPS mount for steering head tube with T lock Attaching a GPS device to a sport bike can be tricky business. We've got you covered! Our ball clamp can be fastened by means of two clamping bushes in control head pipes with an inside diameter of 12. 5 to 25. 0 mm. The 1" ball is compatible with our clamp arm and device holders, as well as socket arm systems. Now, you can individually position your GPS device, GoPro or camera, even on a sport bike. In