The ornamental design for clamp for bicycles, as shown and described.
FIG. 1 is a front perspective view of the clamp for bicycles showing our new design;
FIG. 2 is a front elevational view thereof, shown at a larger scale;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a rear side elevational view thereof, shown at a larger scale;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom elevational view thereof; and,
FIG. 8 is a front perspective view of the clamp possibly attached to a support stand.
The broken line showing of features in the drawings is included for the purpose of illustrating “use and environment” and forms no part of the claimed design.