so i bought a pair of modolo q-race track drops from trackstar about a year and a half ago before i really knew anything and didn't realize they wouldn't fit my 25.4 stem. i finally want to switch out to these, but am not sure if i would need a 26.0 or 26.4 stem as they aren't marked and i don't have any spare stems to test them out with. i've searched around online and can't find anywhere with the diameter. any help appreciated.

mountain bike stems usually come in the 25.4 size, and generally most road stems will be 26.0. most stems labled as a "road stem" should come in the proper diameter for your bars.

good luck!

You need a 26.0. I have the same bars...

You can get modolo stems from Nashbar pretty cheap, they will work.

thanks