531 Reynolds Comp build, comfortable with a neutral ride, more so now with 23-25c tyres than the 20c I used to run in the 90's.
Trek Emonda S6 build, comfortable and a far more responsive ride, better power transfer through a sizeable chunk of frame around the bottom bracket and 2.5Kg (5.5lbs) lighter than the 531.
I still do most of my riding on steel...
