11-18-2014, 08:45 AM
~1970 Gitane Mixte. Prior to rebuild wife could only pedal forwards, as peddling backwards would have chain occasionally jump off.. but only in larger rear gears and larger front sprocket.
To my knowledge, this bike has not been serviced.
I believe I now know why.
If I look from rear of bike forwards with eyes at axle height, I'm seeing the that the chain from what would be the middle of 2 front sprockets, would hit the 4th of 5 gears (next to smallest rear gear)...
Looking at internet posts, this would seem to want to be aimed for the 3rd (middle)...
When I did the rear bearings last night I found 2 spacer washers in between gear side cone and gear side nut... but only 1 in-between non gear cone & nut.... which would seem to shift the gearset to the left, moving 'center of chain' toward the 4th gear.
Methinks if I remove one spacer washer, this should move the gearset to the right, moving the optimum chain positioning toward gear 3, and hopefully pedaling backward, on large sprocket will keep chain on???
????
To my knowledge, this bike has not been serviced.
I believe I now know why.
If I look from rear of bike forwards with eyes at axle height, I'm seeing the that the chain from what would be the middle of 2 front sprockets, would hit the 4th of 5 gears (next to smallest rear gear)...
Looking at internet posts, this would seem to want to be aimed for the 3rd (middle)...
When I did the rear bearings last night I found 2 spacer washers in between gear side cone and gear side nut... but only 1 in-between non gear cone & nut.... which would seem to shift the gearset to the left, moving 'center of chain' toward the 4th gear.
Methinks if I remove one spacer washer, this should move the gearset to the right, moving the optimum chain positioning toward gear 3, and hopefully pedaling backward, on large sprocket will keep chain on???
????