Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Assuming correct sized headsets are installed correctly, there is zero impact from multiple installations. The level of interference is well within the elastic range of the frame, so each headset stretches the headtube slightly which then shrinks back to it's original dimension when the cup is removed, ready for the next time.
Metal frames can go through this cycle many thousands (if not hundreds of thousands) of times with no ill effects, or permanent change. The only way the headtube would be damaged causing loose fits if an oversized cup were pressed in, expanding the headube beyond it's elastic limit, or if it were reamed removing more metal.
By analogy, consider a spring. You can flex it millions of times and it'll always spring back to it's original size, but if you stretch it to far, it'll rebound to a new size and act like a spring starting from there.
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