# the sachs 7 speed
c = 180
24 44 48
13 15 17 20 23 26 30
#
# the sachs 7 speed
# 
c = 180
24 44 48
13 15 17 19 21 24 28
#
# the sachs 7 speed
# 
c = 180
24 44 48
13 15 17 20 24 28 32