>>1283117I recently got a late 70's (1979?) Centurion Japanese road bike. The gear shifts are on the downtubes like most vintage road bikes. I plan on doing some touring this summer with it and I want to know how to shift better with it. Sometimes I'll shift and it just wont click right and when I stop pedalling the chain will fall off partially until I pedal again. How do I shift properly with these things?