Chain jumping between gears

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Hip Priest

Veteran
I put a brand new cassette & chain on my father-in-law's old Peugeot, but the gears are skipping when a decent amount pressure is applied to the pedals. It's an old-fashioned bike with downtube shifters, and the limit screws are set correctly. What could be causing it?
 

Herzog

Swinglish Mountain Goat
I put a brand new cassette & chain on my father-in-law's old Peugeot, but the gears are skipping when a decent amount pressure is applied to the pedals. It's an old-fashioned bike with downtube shifters, and the limit screws are set correctly. What could be causing it?


Index or friction shift?
 
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