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Stem measurement help(4 posts)

Stem measurement helpdddpt2
Jun 30, 2002 12:31 PM
Are stems measured from the centers of each tube or from an end? Thanks.
Center to centerKerry Irons
Jun 30, 2002 3:27 PM
Although with riser stems, some companies use a "projected center to center" so you have to really know by brand.
Center to center(nm)Dave Hickey
Jun 30, 2002 3:28 PM
once again, there's more to it...C-40
Jun 30, 2002 6:47 PM
There is more than one place to measure center to center.

With threadless stems that may have several available extension angles, most brands have switched to measurements taken along the side of the stem, parallel to the extension angle, from the center of the bars to the center of the steering tube.

Older quill stems could be measured by laying a scale on the top of the stem and measuring from the center of the quill to the center of the bars, since they virtually all had the same 73 degree angle.

If you lay a scale along the top of most new threadless stems, you will find that a 110mm stem may measure 115mm. If the stem has an angle that is much more than 80 degrees, you also have to consider the affect of the angle on the horizontal reach. A 110mm, 90 degree stem, for example, will only have a horizontal reach of about 105mm.