Small pump on training rides, CO2 for rallies and sportives. I ride tubeless, so I'm only concerned with being able to get the tire up to 60-80psi with the pump, and if it doesn't seal back up properly, I know I have the pump to be able to air it up every few miles if need be. Most of the rallies and sportivies I do have SAG, so I carry 2 CO2s in my saddle pack, and if I go through that, I'll just catch a ride back to the end.