http://www.sheldonbrown.com/schwinn-braze.html about sports tourer brazed frame.
http://re-cycle.com/History/Schwinn/SwnB_Serial.aspx Schwinn Serial Numbers and Date Codes
http://johns-recycled-bicycle.blogspot.com/2014/07/1973-schwinn-sports-tourer-restoration.html
http://www.bikewebsite.com/spokes.htm tipical length for 27in wheel .
http://centurycycles.com/tips/tech-talk-know-your-tire-size-pg1275.htm Tech on tires and tubes english and metric.


Bottom Bracket removal   https://www.youtube.com/watch?v=yBnYoYVTnlo     rj the bike guy How To Remove/Install Sealed Cartridge Bottom Bracket
Rebuild a bottome bracket  https://www.youtube.com/watch?v=lar7mIMmTRE   rj the bike guy