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  1. or download this
    #!/usr/bin/perl
use strict;
...
    
    print "\n";
}
  2. or download this
    Wheelsize:   26.5
Chainwheels: 42 32 22
...
1: 77.09 2: 65.23 3: 56.53 4: 49.88 5: 44.63 6: 40.38 7: 35.33 8: 30.2
+9 9: 26.50 
Chain wheel: 3 ratios:  
1: 53.00 2: 44.85 3: 38.87 4: 34.29 5: 30.68 6: 27.76 7: 24.29 8: 20.8
+2 9: 18.22