c.i.m.
the bicycle entered by the "constructeur" imbert, who did not start, presented some very interesting points:
1: The steel stem is of small diameter so as to keep the alloy steerer tube of sufficient thickness.
2: replacement bulb kept in the handlebar plug.
3: moyne freewheel removal tool with alloy handle.
4: the colomb bell also contains the headlight switch.
5: the taillight is protected rather effectively.
6: the cyclo derailleur is equipped with a control cable on an eccentric lever, ensuring equal spring tension in all gears.
7: to follow the regultions, the headlight had to be protected : here is what they arrived at.
pitard
8: protection of the taillight : the attachment screw of the cover is a wingnut. the wire is evident on the outside.
9: it was necessary to modify this mafac lever to attach the cable with a screw.
10: le chat derailleur and its lever. the cable tension of the cyclo is controlled by this lever : the other end of the cable is connection to a spring, as shown in the lower drawing, by a pinch bolt.
11: the barralumin frame is equpped with a prototype externally jointed / coupled headset.
c.d.f.
1: the lighting switch is mounted on the d.f.v. stem.
2: the mechanism for slackening off the rear brake cable.
3: the cipaphote reflector, which equipped all bikes.
4: under the dome of the sonn-nett, a steel wire supports a spare bulb.
5: a small supplementary lever, mounted on the pivot of the cyclo lever, assures derailleur tension.
hugonnier-routens
6: the taillight of routens, fixed to the mudguard, conforms to regulations.
7: the two buld headlight assures lighting in accordance with the highway code.
8: light brake lever, with a sturdy nut replacing the traditional, but prohibited, welding.
9: the ultralight dynamo, from czechoslovakia, seems to be composed only of one serrated roller. note the complicated wiring, because of the improvements made to the return wiring system.
10: bell wingnut, reduced to one wing.
11: simple front derailleur of very reduced weight.
12: in order to win pounds and bonus points, the chain tension lever is mounted quite close to the cranks.
13: light, but not very commercial, attachment of the sadde. two separate screws ensure fixation on either side, in order to avoid the crushing which would be caused by a single bolt.