I'm not worried either...my husband's has the discs...but he only got the upgraded DS 8.3 because they wouldn't have the 8.2 for another month in the size he needed. We both rode a little today when we got home (it was too cold for much more!) and we love the bikes. For our purposes (rail trails...mostly flat, neighborhood) I think these are more than fine for us and I feel comfortable pulling the baby in the trailer we got also. I'm not going to be pulling her up or down any steep hills (I wouldn't feel comfortable with that even WITH disc brakes).