Quand le dérailleur
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 the...
Look closer still and you will be able
to count the 'teeth' on each sprocket...
'Crankset' has three sprockets, each
one selectable by the 'front dérailleur'
'Freewheel' has 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'...
Crankset: 28, 38, 48, and...
Freewheel: 13, 15, 18, 19, 21,
The puzzle entitiled "Inches
per What?" provides the rationale for measuring the 'speed' of a bicycle
in 'inches' along with how to perform the requisite calculations.
#1~28, #2~38, #3~48, and...
#1~34, #2~24, #3~21, #4~19, #5~18, #6~15, #7~13
How many 'speeds' are determined
by the dérailleurs on Brigitte's mountain bike?