Actually tires shouldn´t cup like that...tire cuppings 2 major causes r under inflation or bad balancing ...its not uncommon 2 have 2 rebalance bike tires .they take a beating with pot hole e.t.c.....tire presure needs 2 b checked regulary temp affects tire pressure on a bike dramatically. They say worn wheel bearings can also effect tires like u mentioned ...hope this helps u out... also any aftermarket bike manual wiil have a section detailing what I told in more detail .