Just come across some pictures of Michelle Pirro, Johann Zarco and Stefan Bradl testing at Jerez, https://www.motogp.com/en/gallery/2021/01/22/motogp-stars-return-to-action-in-jerez/360426. No prize, but does anyone (else) know why the difference between Pirro’s and Zarco’s V4 ? Andy
I don't think Zarco is allowed to ride anything other than a road bike under Motogp rules. Pirro's bike looks like a race bike.