There are several differences between my SR and your "unknown" bike.
- Cone Shaped headset on my SR-Semi-Pro
- Aero (AX) shifters on the SR-Semi-Pro
- Non-round seatpost on the SR-Semi-Pro (note the seat tube is round at the bottom).
- Non-round lower headtube lug.
- rear brake cable routed below the Top Tube.
- I like [MENTION=493655]Hubertus[/MENTION]' front cable clip.
There are also quite a few similarities between the bikes. It is possible they are the same, but different years.
However, I would imagine there is a common tube set, and lugs. I need to move my pump peg, and I'll verify my tubing type.