Dirt Girl and Irulan, thank you both for the info. And don't worry, we didn't ruin any of the nice trails. We were actually riding in the freeway construction across the road from our house. And we did far less damage to their roads than all of the heavy tractors and semis that rumble through there all of the time! But I never even thought about mud riding damaging the trails. I will be sure to pass it on to bikerHen, and make sure we don't damage any trails. And BikeMomma, well spotted! Mine is dirtier because I was having fun riding throught the deep mud, while mom took it easy and stuck to the firmer mud.