There is a Canal Winchester loop that is approximately 33.5 miles and is considered "easy". It is possible to extend to 102 miles. The address provided is for Shades Restaurant -- where one group starts (Option One). See below for another option and use link to learn more.
The Tuesday Night Group Ride leaves at 6p SHARP on Tuesdays starting at Canal Winchester which is about 20 miles SE of downtown. The ride starts in downtown Canal Winchester (which is a 20 minute drive southeast from downtown). Park in the public parking lot behind Shades (restaurant). Take US33 towards Lancaster and take the High St exit. (First right after the 674-Gender Road exit.) Left into alley at Huntington Bank. The ride starts exactly at 6P. For routes, check out http://www.ridewithgps.com and keyword search for CWTNR.
Other groups do Sunday morning rides beginning at 8a (check link to be sure) at distances between 40 and 60 miles. This group meets at the Cyclist Connection Bicycle Shop, 200 Cemetery Road, Canal Winchester. Follow Route 33 east and exit at Gender Road/Rt. 674. Turn right, then left at the traffic light onto Waterloo Road. Drive past the Wal Mart and turn left onto Win-Cemetery Road.