Join Date: Mar 2006
Bikes: Specialized Roubaix Pro (Carbon), Specialized Langster, Specialized Sequoia, No-name MTB
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On 3 bikes, I have 1 adjustable, 1 alloy (Ritchey Comp), and 1 carbon (FSA OS-99 CSI). The only difference I have really noticed is weight. The alloy and carbon are both very light, but the adjustable stem (came on the 2003 Specialized Sequoia) I have might at well be used as a boat anchor, comparatively.
Other than that, I have noticed no difference in performance or problems with them.