Absolutely nothing wrong with your statement. Props to you for knowing and wanting to ride whithin those parameters. You don't need a GPS. A simple map does well. Put a ride together with the parameters in your post and all is good. You will get takers. If you decide to join another posted ride and the pace a little faster than you are looking for don't worry. Like Doc says "no one gets left behind". With that said if it is posted as a spirited pace you should understand what your in for.