Just a guess, but a 14-32, 6 speed Suntour is most likely a ProCompe or Perfect model. They came in two different 6 speed spacing configurations, Suntour standard or Suntour Ultra (narrow) spacing. Neither are truly compatible with Shimano SIS 6 speed index shifting. If your shifters have a friction setting, you will need to switch to that for a Suntour. I have the spare sprockets needed to convert to a 14-28T. Can you check the Suntour model and post a picture?
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Bob
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