Bike Reviews

I think I realized what the problem is… I have a specialized alum mountain bike. In the rear sometimes the tires rub against the rear of the frame because the wheels get out of place when I’m straining going uphill climbs. I think its because my wheel clamps.. the long rob and clamp that keeps my wheel in place is stripped? Meaning where the metal from the clamp meets the metal where the hub rests on the frame is grinded down giving no grip at all. The metal seems kind of worn down and getting thin on the frame itself there. What can I do so keep the wheel in place so it doesn’t move around in rough situations?