25.4 size handlebars with 31.8 size stem
#26
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I'm looking to put a 31.8mm handlebar into a 26.0 stem
#28
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If you could accurately remove enough metal from the stem to allow this (Which would be very difficult indeed.) the remaining metal would probably be too thin to provide enough strength. You may also have interference between the new bar ant the bolt or bolts.
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