ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins65% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
Pirelli's[2] own 40th-anniversary article says "The first appearance of the P Zero brand dates back to 1985, with the debut on the Lancia Delta S4 Stradale" - a year rather than a day.Pirelli introduced the P Zero on the Lancia Delta S4 Stradale, the tire that gave rise to the Ultra High Performance category; the first generation followed in 1987 to equip the Ferrari F40. It launched the company's 'Perfect Fit' strategy of bespoke tires for premium automakers.
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