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Stem Rise?

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Stem Rise?

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flag O-7plymaple-O
Posted: Mar 16, 2012 at 13:15 Quote
How do you measure the rise of the stem? Is it from the bottom of the stem to the center of where the bar is held? Is there any pictures/diagrams that show where to measure to find out the rise of a stem?

I would like to measure my stock stem and compare that to the specs of new stems to see how much rise I would actually get.

Thanks.
flag O-7plymaple-O
Posted: Mar 19, 2012 at 8:03 Quote
Well in case anyone else was wondering this too. I found out the rise of a BMX stem is measured from the bottom surface that sits on the spacers, to the center of the bar when clamped by the stem. And the stack height is just the height of the back end that is clamped between the head set spacers and the compression cap/bolt.

So if you are going for maximum rise when you buy a stem you want the most rise and the smallest stack height. Smaller stack height will allow you to put more spacers under the stem. Giving you that much more rise.

For example if you look at the Cult Salvation stem vs the Profile Push stem. Both have almost the same rise (31.8mm vs 31.7mm) but the Cult Salvation has a stack height of 29.2mm while the Profile push has a stack height of 33mm. Meaning if you tried both stems on the same bike you would have 3.8mm more steer tube sticking out the top of the Cult. And this allows you to put that much more height worth of spacers underneath it for more overall bar rise.

Cult Salvation specs on danscomp.com:
http://www.danscomp.com/products-PARTS-STEMSTOPLOAD/370029/Cult_Salvation_TL_Stem.html

Profile Push specs on danscomp.com:
http://www.danscomp.com/products-PARTS-STEMSTOPLOAD/370106/Profile_Push_Stem.html

I know with the numbers I used as an example 3.8mm seems like height weenie'ism. But it's something to keep in mind when looking for a stem. Dont just look at the rise. Look for the rise vs stack height. If you buy a stem with the same rise as your old stem, but with a taller stack height you may have to remove some spacers for it to fit. Lowering your overall bar rise.

I am not trying to say either of these stems is better than the other. But I noticed they are very similar and thought it would be a good example.

Just sayin...
flag
Posted: Mar 19, 2012 at 9:17 Quote
It makes no difference just go ride
flag O-7plymaple-O
Posted: Mar 19, 2012 at 9:31 Quote
Joedavidson wrote:
It makes no difference just go ride

That's the spirit!
flag DaltonBourne
Posted: Aug 21, 2021 at 5:35 Quote
A bicycle with insufficient reach is usually uncomfortable as it causes cramping. That's the reason why you must measure your bike stem for optimum performance and comfort throughout the road. The first thing to do is to place your road bike against something firm. Know the length by measuring from the middle bolt of the bike’s headset top to the center of the handlebar. A bike stem length usually runs in 10 mm increments and starts from 70 mm to 140 mm. The measurements you get are possibly off by a few millimeters, you must adjust the measurement to the closest 10 mm increment.
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