Been thinking 'bout a seatpost upgrade for a while, but I can't find any info on the seat post length or diameter of my current post. I ride a Trek Fuel EX7. Also, diameter is more important since I think Speedball's only come in one length.

There should be sizing written on the seat post down the bottom.

You can always measure the diameter, but make sure you get it right!

Danke, meine freund! 31.6mm.

Next time your near the hardware store, do yourself a favor and invest in a caliper. The cheapo plastic ones only cost a few bucks. A metal one, $10.

Calipers are a good addition to one's toolbox. I have the aforementioned cheapos although I don't trust them at a 0.05mm accuracy level.