est de rigueur?
-- Brigitte Niquette
it may be somewhat difficult to make out in the
photograph on the left,
Brigitte's mountain bike is configured with conventional
gearing as depicted
in the sketch on the right.
Look closely and you will see that
Look closer still
and you will be able
to count the 'teeth' on each sprocket...
three sprockets, each
one selectable by the 'front dérailleur'
seven sprockets, each
one selectable by the 'rear dérailleur'.
It is customary to
provide an 'index'
for each dérailleur
to denote the present position of the 'chain'...
38, 48, and...
13, 15, 18, 19, 21,
The puzzle entitiled
per What?" provides the rationale for measuring
the 'speed' of a bicycle
in 'inches' along with how to perform the requisite
#2~38, #3~48, and...
#2~24, #3~21, #4~19, #5~18, #6~15, #7~13
many 'speeds' are determined
by the dérailleurs on Brigitte's mountain