My guess is that the seller had it set-up as a 9 spd with nice wheelset he couldn't part with and replaced it with the original wheelset to sell it. I'd replace the fugly stem and adapter with a quill, unless the bars are 31.8 for some reason, keep it 9 spd and buy a decent 130mm wheelset for it. Nice bike BTW. Not sure why you can determine the frame tubing. What does the Columbus decal say? If it doesn't say, it is probably SP I believe.