The ornamental design of a spoke for reel, as shown and described.
FIG. 1 is a perspective view of a spoke for a reel, embodying my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a sectional view thereof, taken along line V—V of FIG. 2.
The broken line showing the tape winding reel is included for the purpose of illustrating environmental structure and forms no part of the claimed design.