Aprilia's RSV4 X grabbed all the eyeballs at the 2019 Aprilia All Stars event at Mugello. The sportsbike is an even more hardcore track-only version of the RSV4 with a production run of only ten units. The ‘X’ symbolises the ten years of Noale's finest superbike as it was being ridden around Mugello by none other than former WSBK and 250cc world champion Max Biaggi.