I've got one on my bike, albeit 28.6. I was heading to the hardware store today anyways. I'll see if I can match up the thread pitch and length while I'm there.
M5 - .8 pitch - 40mm length
Shouldn't cost more than $1 or so.
I'd try a bike shop before you go to a hardware store. My local hardware store has a larger selection of screws than than big box home improvement stores, and they didn't have the correct length in stock. Worst case scenario, try contacting Salsa.
Last edited by Shang; 11-01-09 at 03:20 PM.
Reason: Size update