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Turning stem over?(2 posts)

Turning stem over?Bruce
Sep 11, 2001 12:47 PM
I am wanting to turn my stem on my Trek 2300 over from how it was installed at the bike shop. Do I have to take any precautions or is it as simple as loosening the allen bolt on top until I can take it off and flipping it over or is there something special I need to do?
re: Turning stem over?Atombomber
Sep 11, 2001 4:00 PM
The only thing you need is a 5mm allen key, some grease and common sense.

You will need to remove the stem face that clamps the handle bar, then you will need to remove the headset top cap, then you can remove and flip the stem. Make sure the handle bar is held such that no cables get bent or the housing gets crimped. Be aware that the fork will fall out once the stem is removed. Take care to hold it up with a strap under the crown and over the downtube of the frame, or have the front wheel resting on the ground/floor.

When reinstalling, the spacers that came off can be used above or below the stem, and all must be used until you decide to cut the the fork's steerer tube to the correct length. Set the stem back over the steerer the way you desire, and then put the handle bar where it belongs and snug the face plate to hold the bar so you can still adjust it. The face plate should have the same gap between the stem above and below. Once the stem is in place, and the the remaining spacers are over the stem, such that the steerer tube sits 2 millimeters (less than 1/8") below the spacers (or stem, if all spacers are below stem). Then you can put the headset cap in place and thread the bolt into the star nut inside the steerer tube. Once you have everything in place, you can set the stem straight so it aligns with the front wheel. Leave the stem bolts loose. Tighten the top bolt such that the headset has no play in it, but does not bind either. There is a fine line between too tight and too loose. Once the headset play is adjusted, tighten the bolts of the stem. Now center the handle bars and rotate them to your desired angle (make a mental note of what angle the bottom of the drops (horizontal) are before you disassemble). The grease is for the surface of the spacers where they contact each other. Use only a thin coating. Do not apply it directly to the fork's steerer tube, but don't fret if you get some on it. You might want to take a bit of emery paper and sand off the anodizing on the inside of the stem and stem face plate where it contacts the handle bar. This prevents the bar from slipping.

You might need to re-rotate the handle bar to find the optimal position, and shift spacers around until the proper bar height is achieved. Let common sense prevail, and you should not have any problems.