Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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As stated, the clamp on Shimano clamp-on front derailleurs can't be changed. You need the right diameter clamp or a braze-on front derailleur with the proper diameter adapter clamp.
Your profile doesn't give a location so we automatically assume you are in the USA. Since you are not it would be helpful to tell us where you are located and perhaps, someone can help you find what you need there.