Love seeing these old tracker cycles , some real beauties. We also rode them here in South Australia Here we called them Skid Kid bikes. They were patterned on cycle speedway bikes. Cycle speedway was very popular in this state and is still going here with 3 clubs, the most well known here being the Findon Skid Kids.Bikes that copied the look of cycle speedway were popular here with teenage lads. used old 26" roadsters, same cow horn bars and 26" x 1 3/8 tyres. Most had rear brakes only or no brakes, stopping by shoving your foot between rear tyre and seat tube. Here are photos of the one that I built in about 1982, using a South Australian made 26" Porshe (correct spelling) 5 speed racer which had drop bars It was a hand me down from brother. I put 27" straight forks on, BMX stem & MX bars. I rode it hard for yrs: 2 frames, 3 sets of forks, rear wheel, cranks & derailler. converted to cotterless cranks, used Trelleborg sweedway tyres when I could afford them.They wore out quickly. Local track was a creek with big jumps and used to bomb down steep dirt roads. I did big wheelies and lost heaps of skin. Hope you enjoy Pics