When I looked at my Montana 750, it can handle the impressive size of 100 - 9,999 mm.
With 100 mm, you can measure the speed of wheels on skateboards and roller skates by drilling a small hole and gluing a magnet to the side of the wheel and using an ant+ speed sensor.
With 9,999 mm, you can easily measure the speed of the front wheel from a penny farthing bike.
penny farthing bike
Can anyone check the speed sensor settings and share the results here?