parts bin mishmash drivetrain

12-32 Sram 7 speed (actually lighter than the old HG50)
870 Sram chain
52-40 Arabesque rings, tricolor bolts, 6500 arms.
Short cage 9 speed Ultegra rd with the b-screw flipped and bent a little.
Campy fd.
105 downtube shifters

30mm grand boy tire just fits in the back. Tight gaps.