I did it guys, and after only just over 2 months of being a bike rider. I rode my age, 54 miles, in 3:56. I'm sure my running background and fitness level helped a bunch in accomplishing this.
In other news, on 08/02 my spine specialist gave me permission to return to running. He said I can do a mile at a time and progress in 6 week intervals. I know he means that should pain return, stop running for 6 more weeks and I also suspect he means to increase mileage in the same 6 week intervals.
While on this hiatus from running, I've made some good accomplishments on the bike, made some great new friends here, and had some great fun. I plan on keeping the bike as a permanent part of my fitness regimen. I'm sure the day will come when my spine refuses to allow my running but the bike has been 100% pain free for me.