Black La Lane
Join Date: Dec 2004
Location: Maplewood, NJ
Bikes: EPX 303 (You probably never heard of it)
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First. The pic shows cross chaining. That is use of little chainring+little cog combination. It is best to avoid the two extreme combos of big chainring+big rear cog and little chainring+little cog because of the combination of slack or tight chain tension and extreme angle of deflection.
Second. If your gears slip in other combinations, it may be time to have the deraileur cables either tightened or replaced. As this is a vintaged bike that looks like it has been around a while, you may benefit from cable replacement. They will replace the cables and adjust so that your shifts are clean and effortless.
By the way, you can only shift cleanly if you "light pedal" during the actual shift. In other words, ease up on the pedal pressure once you have shifted until the chain has complteted its shift. Then resume normal pedal pressure. Make sure to allow additional time for shifting the front chainring. You are moving more chain during the shift and it takes a half-second longer for that to happen. Read the road ahead and plan your shifts in advance to be in the right gear at the right time and you should be fine.