Performance and 0 - 60 time > Light weight means brisk performance, despite the rear tyre's constant struggle for traction. (evo.co.uk)
And it can well appear that these opposing entities are in constant struggle — we would probably say, constant tension. (religion-online.org)
Almost all kids hate doing homework or having to clean their rooms, and this can be a source of constant struggle between parents and their children. (babygaga.com)