Bianchi made and still makes well put together bikes. If its a road bike frame I would still use it but be aware that the tubing used is thinner due to the expectation that the bike will live a relatively easy life. 4130 has a great ride quality and is less prone to bending than high tensile steel. You wont get very wide tires if it is a road bike but bianchi made and still does make all kinds of bikes.