It will effect your handling... especially at slow speeds. On my bike, I can actually feel the bumps in the tire as a roll over them. It's disconcerting... and I don't like it.Does cupping hurt anything on a front tire of a trike? The tire is like new with about 3000 miles on it and I ran it low on air for two weeks before I realized it and that is what caused the cupping.
Yup- the front of the tread block 'digs' in, the rear tends to lift due to quirm/distortion (talking front tire under braking) causing un even tread block wear. That was why I commented it shouldn't affect balance too much because it tends to happen fairly evenly around the circumfrence of the tire, worse if the tire was unbalanced while getting worn. But, I am no scientist or engineer!The reason for cupping is the fact that the tire has good road adhesion. That stretches the rubber whenever steering occurs. It's inevitable. It's worse on heavy bikes and probably worse on trikes that have a lot higher steering loads and front wheel slippage than a two wheeler. Trikes scrub more in curves since the tires can't lean so they are likely to cup sooner. Different brands and types of tires will cup at more or less mileage.
Cupping per se isn't dangerous. I doubt it will bother a trike as much as a bike since the trike is running on the same area of the tire all the time. As long as the tread is still adequate I'd just run the tire.