carbon stem

The only reason I want to get one is to match the rest of my bike which is as much carbon as it can be. It doesn't seem like carbon stems are any lighter, just look cooler and cost a lot more. Strengthwise, are carbon stems inferior? I was thinking Ritchey 4-Axis matrix carbon.

I've noticed a bit more flex in mine as compared to normal alloy stems. I don't think this translates into much power loss though, just a different and more compliant feel. You're definitely right about the $$ factor - If you're cool with putting down an extra 25% or more on the part, go or it. I'd check out the new bontrager carbon stems if you are in the market - they look awesome and are ROCK solid.

I have a carbon Pro Vibe stem and bar.

Other than being a little trendy (like white components and tape) it's just a stem and feels just as sturdy as any other stem I have used.

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Since you just want some more carbon-bling, consider getting the FSA stem which has a carbon face plate ... the stem, itself, is aluminum.