I'm looking at purchasing a tadpole trike to replace my Thebis delta. I've looked at the TT Sport, but I'm a bit concerned about its performance. I ride regularly with friends and family w/ DF roadbikes and I don't want to get left behind. I've never been a climber, but on level ground I can hold my own on my Thebis. I've considered upgrading to higher pressure tires such as Scwalbe Duranos. Are the Sport rims up to high pressure tires?