Route through LO
I commute from inner SE (37th and Lincoln) to Wilsonville a few times a week.
Usually I take the bike path along Oaks Bottom to the Sellwood bridge, up riverview cemetary then down Terwilliger to LO. From there I go along Iron Mountain to upper drive untill it hits Lower Boones Ferry. If you are going to Tigard you could take Washingon (first light after upper hits Boones Ferry) and then a soft right to Lake Forest Drive. Lake Forest intersects Carmen right above the exit which takes you into the 72nd area. All the roads are surface streets barring Terwilliger (there is an available bike path), and Carmen.