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I am in the process of building a bike with a new frame and fork. The groupset will be from a donor bike. When it comes to fitting the bike and cutting the steerer I would like to do some trial rides to check the fit prior to cutting the steerer.Can I leave the steerer long and install spacers above and below the stem until I get the fit correct? Could I leave a spacer on the top so potential resale would be more likely?

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up vote 9 down vote accepted

Yes. I do this on most of my bikes so I can do a quick fit for a friend when needed and to broaden the appeal for resale. Just make sure to snug up the compression like normal prior to tightening the stem and you will be good.

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And carbon steer tubes are supposed to have a spacer over the stem. – user973810 Sep 30 '12 at 11:41
@user973810: where do you get that from? There's no problem doing this, as long as you stay within the maximum steerer length, but it isn't mandatory either. – zenbike Oct 3 '12 at 3:19

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