Stem length + angle calculation

[bewheels]

Years ago I made a blueprint (pre-digital world) that help sort out different stem angle / stem length / stem length. Does anyone know if there is an online calculator that does this? Or an Excel sheet?

The purpose was to help sort out the affective length and angle impacts on stems when mounted on a real bike.

Example:
If we use a baseline of a 73 degree head angle and a 100 mm stem with a -17 degree angle, we get a "true" 100mm length (distance away from the seat).
Same head angle but with a 100mm stem with a 0 degree angle is now "shorter" (closer to the seat) than the 100mm by -17 degree. Due to the affect of the head angle, the stem is no longer parralel to the ground.
Same head angle but with a 100mm stem with a +8 degree angle is even "shorter" (closer to the seat) than the 100mm by 0 degree.

Plug in different head angles (road, cross, mtb), different stem angles, and different stem lengths and you could see what the combos turn out to be.
Is the reach of a 110mm by +8 degree stem the same as a 100mm by 0 degree stem?

Anyway, anyone know of an online calculator for thus?

BTW - the height, or seat-to-bar drop, is ignored for this.

[teleguy57]

Lots out there if you google. This is my newest favorite.

http://www.ttbikefit.com/stemcalc.html

Unfortunately, not Apple compatible as it uses Flash.... And I apologize for referencing a tri site:)

[choke]

A couple more....

http://alex.phred.org/stemchart/Default.aspx

http://www.brightspoke.com/t/bike-stem-calculator.html

[DfCas]

I like the hab one

http://www.habcycles.com/fitting.html

[azrider]

BUMP (so i can keep better record of these calculators)

Nothing to see here

[teleguy57]

Lots out there if you google. This is my newest favorite.

http://www.ttbikefit.com/stemcalc.html

Unfortunately, not Apple compatible as it uses Flash.... And I apologize for referencing a tri site:)

+1 on this calculator -- with all the caveats:)

[zetroc]

Soulcraft has a great tool on their website:

http://www.soulcraftbikes.com/stems.php

[soulspinner]

If yer calculating height at the bars, don't forget to factor in stem collar height, they can vary several millimeters or more.

[azrider]

If yer calculating height at the bars, don't forget to factor in stem collar height, they can vary several millimeters or more.

Speaks the truth! I learned this the hard way

[gospastic]

I use this one. It factors in pretty much everything.

https://public.sheet.zoho.com/publish/lwrncc/stack-reach-calculator-v1-00