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Old 01-14-22, 05:59 PM
Road Fan
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Bikes: 1980 Masi, 1984 Mondonico, 1984 Trek 610, 1980 Woodrup Giro, 2005 Mondonico Futura Leggera ELOS, 1967 PX10E, 1971 Peugeot UO-8

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I would say, you NEED to have the ID of the stem handlbar mounting bore and the center of the handlebar OD match. If the bar is too big, the stam clamp should fraccture as you tighten the clap bolt. the bar is too smal for the stem, you will over tighten the clamp screw and possibly never achieve tension. And due to the over tightening, it could still fracture the stem.

When the stem fractures, if you are riding, you will most likely crash and hit the ground, possibly with your face.

There are many sizes for the parts in question, and if they are now distorted, they are already over stressed and hence dangerous. Aluminum does not like to be cold-set.
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