i have a 1980 Schwinn Cruiser in building up and I'm putting a freewheel on it. I already have a 39 tooth chainring, looking for advice on freewheel tooth. The bike will be more of a cal cruiser/Strandie with a lil BMX flair. Will mostly be ridden around camp grounds, beach sidewalks. I looked at the new SE 26" BMX bikes and they have a 39 chainring, and a 17 tooth freewheel. Thoughts?