I'm frustrated with my nishiki landau circa 1975-77.
When i pedal off the saddle and press down hard on the crank the chain flies off the large chain ring. makes for an increadibly loud sound and embarassing moment putting it back on.
I've since adusted the fd properly. sill happens. The big chain ring doesnt seem to be more worn than the little chain ring although there is some sign of wear.
The most important observation is that when around the chain rings, the chain can be pushed down further onto the ring than when it rests. In other words, the chain is not flush against the teeth of the chain ring - i can push it down a couple of mm. I dont think this is normal compared to all other bikes in the garage.
where does the problem lie? is it the chain ring that needs to be replaced... or do i need a new chain (possibly streched?)
thanks for helping out,