Originally Posted by
JiveTurkey
2. You could use trigonometry to figure it out, or go to this nifty link:
http://alex.phred.org/stemchart/
For both stems, use "90" for the reach, "72" for the head tube angle, and the same number of spacers.
For red, use an angle of "0" and for blue use the angle of the stem you have. It'll probably be somewhere between 7 and 35 (this is the angle the stem rises out from perpendicular to the steerer tube). If the stem is flipped, then this value will be negative.
It will tell you how much shorter reach the blue stem has compared to red; subtract this from 90mm to get the effective reach of your stem.
Red
Reach: 90
Angle: 0
Spacers: 35(mm)
Blue
Reach: 90
Angle: 35
Spacers: 35
Steer Angle: 72
Results:
blue stem has 31mm less reach and is 44mm higher.
steerer: 72
red stem: 90mm reach, 0 degrees, 35mm of spacers
blue stem: 90mm reach, 35 degrees, 35mm of spacers
Did I do it, right?! But wouldn't this be comparing the 90mm adjustable riser stem with an angle of 0 degrees with the raised height of 35 degrees? What if I want to compare the blue stem [current configuration] with the the red stem of the stock configuration with a 100mm stem and I'm not sure what angle.
Then, I want take the length of the stems and add it to the eTT lengths of both the 56 and the 54cm Cross Checks. Help me out, dude. I gave that website a shot.