Guys, which stem will go with this?
 

I just bought an profile design, syntace combination bar, obviously it is not fit with my 31.8mm stem, I need to buy a fit stem with this, the shop is quite far from here so I don't know how to buy a fit one, will try to buy the stem on the net so they could send it to me. please check out the photos and help, it doesn't write any diameter on it at all.

If it's not a 31.8, it's 97% most likely a 26.0

Profile Designs list the Airwing as either 26mm or 31.8. So if your 31.8mm stem doesn't fit you will need to search for a 26.0 stem.

http://www.profile-design.com/profil...s/airwing.html

thank you very much guys, will buy a fit stem for this

You can always buy "shims" that will allow you to use your existing stem.