The ornamental design for a treadmillbelt, as shown and described in FIGS. 1 through 5.
FIG. 1 is a perspective view of a treadmill with a first embodiment of a treadmill belt according to the invention, the treadmill belt comprising slats with a grass-like upper surface.
FIG. 2 is a perspective view of the treadmill belt of FIG. 1.
FIG. 3 is a top plane view of the treadmill belt of FIG. 1.
FIG. 4 is a side elevational view of the treadmill belt of FIG. 1.
FIG. 5 is an elevational view of the front or rear end of the treadmill belt of FIG. 1; and,
FIG. 6 is an enlarged view of the area encircled in FIG. 2.
The broken line showing of a treadmill in included for the purpose of illustrating environment and forms no part of the claimed design.