The only difference between the Arbor Summit 78a Longboard Wheels and plain old urethane wheels is that the person riding the Summit's aren't sweating bullets or feeling the chatter of a burly road. There is no reason to be concerned when the 2.5 mm offset increases road grip to absurd levels and the softer durometer will keep your board flowing over anything. Slash the hills with the Arbor Summit 78a Longboard Wheels when the going gets steep.