Draw a circle on the page the size of the hamster wheel. In order to make the wheel perfectly round, use a compass.
Draw a second circle, centered within in the first circle, only slightly smaller than the first circle. This represents the far side of the hamster wheel. Use a compass to draw this circle.
Draw a line straight through the inner circle, cutting the circle into two symmetrical halves; use a ruler. This line may be drawn in whatever direction you like, as long as it cuts the circle in half. In the center of the line, draw a small circle and shade it in so it appears solid. This represents the part of the wheel that attaches to the cage.
Draw radiating spokes from the outer circle of the hamster wheel to inner circle -- the far side of the hamster wheel -- representing the spokes of the hamster wheel; use a ruler. You may draw as many of these lines as you like and put them as close together as you like. What is important is to make sure the lines all point toward the direct center of the circles, so that if they were extended, they would go straight to the center.