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I had one of this vigorelli steel and it was the best track bike i ever had. so much more fun to ride then the alu triple triangle i posted before. i think that the fact that a bike to be fun in the street have to be super step stiff and with no clearance is a false myth. especially the front end of the vigorelli with a 72.5 and a 43mm rake fork was amazing the rear with 75 degrees was still too step and i needed a seat post with setback .
Because it's gone out of fashion, whether a nominal fork will suffice for track racing as long the head angle adjusted accordingly, Cinelli Vigorelli for instance.
Generally a steep seat tube mean the wheel can be move closer to the seat tube.
A slack seat tube mean the wheel cannot be as close as possible as the seat tube is in the way.
The conventional wisdom suggest it help with frames stiffness, drivetrain effectively (shorter chain), etc. which is not the case nowaday.