Stack Question for Stems?

Triathlon Forum
1

I’m trying to determine the effective stack of both my stem and aerobar in order to determine my “ideal” frame. I’m sure this has been discussed somewhere, however I was not able to find a quick answer to the following question:

For a 110mm stem @ 86* with a 35mm clamp area what is the effective stack for the stem? I’ve read the information regarding angled stack on the “Stack & Reach” tables, but how do you account for the stem angle?

Thanks

2

Clamp height 35
Length 110
Angle -4
Head tube angle 73
Stack 41.5
Reach 102.1
.

3

Thanks! Assuming this is a simple trig calc…what is the equation?

4

Stack = Length*SIN(radians(angle+(90-HTA)))+(clamp/2)*SIN(RADIANS(HTA))

Reach= Length*COS(radians(angle+(90-HTA)))-(Clamp/2)*COS(RADIANS(HTA))

Note that the angle needs to be expressed the way I have - as a difference from 0/90.