No-the solid axle is stronger than those hollow qr axles and better able to handle the long gap between the hub under the 7 speed freewheel cluster than the hollow tube of a quick release hub- you have the additional support of that mass in the center of the axle keeping the axle straight with a bolt on axle. I've never had a bolt on axle fail, I've had plenty of quick release axles break under 5 and 6 speed freewheels.