I acquired an earlier Tunturi hybrid frame. It is triple-butted cromoly steel, not sure what size. It's a huge frame though, appears to be a road bike frame almost. If it werent for the 26" wheels, I'd say it was a road bike frame. When I got it, it was skipping all kinds. I removed the front and rear derailleur, and ran it biggest cog up front/smallest cog in back. It has a 52t chainring up front, and a 19t cog in back. Nice long horizontal dropouts, setting up the chain tension was a breeze. This bike is FAST. As fast I can pedal in these gears looks to be right around 27-28mph. Got mahself a SS!