Topanga Diamondback bicycle



OB321D

New Member
Sep 28, 2022
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Was given a used Diamondback bicycle but I have no information on it. I love riding it but do not understand how the gears work. Any advice would be appreciated.
The gears on the left number 1-3 and the gears on the right number 1-7. but do not seem to work and I notice there is no tension when trying to use them. Maybe a the cable is broken?
I have tried to download the manual but I need the year of manufacture for the correct manual and I can't find it on the bike.
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