Stem angles?

[PLuKE]

Hi guys.

I have been looking at changing my stem, not for any reason, I just fancy a change.

I have been looking at the Pro Vibe Sprint which is -10, at the moment I have an FSA -6, will there be any difference is drop being 4degree different?

I would like to get lower on the bike, but not all the way to a -17.

Thanks
Luke

[Bigger Gear]

For a stem of 120 mm length a change from -6 to -10 will put the bars ~ 8 mm lower, provided the stack (clamp height) of the stem is equal. If not, the difference of the stack needs to be factored in. For example if the stack of the FSA is 38 mm and the PRO is 42 mm then the PRO stem is effectively 2 mm taller before the rise difference is accounted for, that is its handlebar center is raised by half the difference in the stack.

To calculate the change for angle you can use: drop/rise = tan(angle difference) * stem length

[vejnemojnen]

Not a bad place to start either.

http://yojimg.net/bike/web_tools/stem.php

takes into account the headtube angle, stem length, angles and also the spacer stack height. allows you to judge thing by a glance

I've found these charts useful as well when comparing different types of stems.

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

Another solution is to alter the "tilt" of your handlebars, or, to get some stems which are designed for 1/4th steerer tubes and use different shims to alter the angle (or to opt for specialized stems which offer those shims allowing you to choose different angles)

Good luck

[PLuKE]

For a stem of 120 mm length a change from -6 to -10 will put the bars ~ 8 mm lower, provided the stack (clamp height) of the stem is equal. If not, the difference of the stack needs to be factored in. For example if the stack of the FSA is 38 mm and the PRO is 42 mm then the PRO stem is effectively 2 mm taller before the rise difference is accounted for, that is its handlebar center is raised by half the difference in the stack.

To calculate the change for angle you can use: drop/rise = tan(angle difference) * stem length

Thanks that's fantastic info.

I would be going from a 100mm to 105mm stem.

I would ideally like to go a it lower, maybe something with -12 degree would be more noticeable.

Thank you

[LionelB]

Good luck finding a -12 deg stem though !

[Ravnsnaes]

The Zipp Sprint SL is -12 degrees. And almost identical to the Pro Vibe Sprint in stiffness.

[LionelB]

I stand corrected then !

[basilic]

-12: extralite as well now (they do -6 and -12, previously only -8)
http://www.extralite.com/Products/HyperStem%20O12.htm

[p3dalfaster]

Is your stem already slammed though?

[PLuKE]

Thanks guys.

Yes stem is slammed no spacers.