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Old 06-01-06, 09:07 AM   #1
Raleighroader
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How to measure stem size?

Is it the total length of the stem, front to back, or is it only the distance from the center of the handlebar to the center of the top tube?
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Old 06-01-06, 09:19 AM   #2
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The nominal length of a stem is from the center of the handlebars to the center of the fork steerer.

Usually the stem's quill bolt (threaded) or headset adjusting bolt (threadless) marks the steerer center.
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Old 06-01-06, 09:50 AM   #3
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Thanks. I did a brain lock when I referred to the top tube, when I meant the head tube.
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Old 06-01-06, 09:52 AM   #4
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Quote:
Originally Posted by HillRider
The nominal length of a stem is from the center of the handlebars to the center of the fork steerer.

Usually the stem's quill bolt (threaded) or headset adjusting bolt (threadless) marks the steerer center.
I've also always been curious whether it is measured along the length of the stem (red line) or outward, perpindicular from the steerer (blue line). With a zero degree stem, these lengths will be the same, but on a stem with rise, they will be different. Maybe not much, but some.
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Old 06-01-06, 03:06 PM   #5
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Quote:
Originally Posted by acape
I've also always been curious whether it is measured along the length of the stem (red line) or outward, perpindicular from the steerer (blue line). With a zero degree stem, these lengths will be the same, but on a stem with rise, they will be different. Maybe not much, but some.
I've seen both quoted. I believe the more common mesurement is along the stem itself, not along a projected horizontal line.

Unless you have a seriously up-angled stem the differences will be fairly small. Assuming a 90-degree stem and a 73-degree headtube angle, the projected horizontal distance will be 96 mm for a nominal 100 mm stem.
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Old 06-01-06, 03:07 PM   #6
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Quote:
Originally Posted by acape
I've also always been curious whether it is measured along the length of the stem (red line) or outward, perpindicular from the steerer (blue line). With a zero degree stem, these lengths will be the same, but on a stem with rise, they will be different. Maybe not much, but some.
I've seen both quoted. I believe the more common mesurement is along the stem itself, not along a projected horizontal line.

Unless you have a seriously up-angled stem the differences will be fairly small. Assuming a 90-degree stem and a 73-degree headtube angle, the projected horizontal distance will be 96 mm for a nominal 100 mm stem.
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