This guy has a schwinn mesa GS for sale ... he says it's steel but he doesn't know what year it is, however, it's blue.

I need to know if it's got a 1 1/8th headset unthreaded.

he currently has a Rockshox indy on it .. if that helps.

I can't find the info anywhere.

Please help

if i saw it i could tell you for sure. depending on the year it very well could be a 1 1/8 threadless or if it's a newer one it could be 1 1/8 zero stack. i have a 98-99 mesa and it has a standard 1 1/8 headset