Hello all I am pretty new to Cycling. My wife and I have picked up cycling last summer. We both went to dicks and bought bike trainers (Blackburn tech mag 1). The question I have is how much tension do I need to have? When I ride on the street and stop pedaling I cruise. When I am on the bike trainer and I stop pedaling my back wheel stops in about 7 seconds.

I normally ride in the big gear on the crank and the wheel i ride on the 2nd or 3rd lowest gear on the trainer. When I am pedaling I am rolling at about 18 mph on the trainer. Is that normal. I want to have as close as the same ride on the road to the trainer. Is that possible with the trainer I have?