Ferrari 308 GTB Qv
Ferrari 308 GTB QV Tyres
Ferrari developed the 308 even further by developing the Quatrovalvole or 308 qv with 4 valves per cylinder. These cars stuck with the 220/55VR390 Michelin TRX tires initially, then later cars moved onto 16" wheels.
It is worth referencing that when Ferrari did put their 308 GTB qv and 308 GTS qv onto 16" wheels they didn't fit wider tyres, they actually fitted thinner front tyres. The common thought among people is that "bigger is better", and so many people with these cars often want to take off their standard wheels and fit wider tyres. If this were the better option then Ferrari themselves would have done it.
Ferrari 308 GTB Qv Recommended Tyres