Tyre size Sept 28, 2021 13:41:33 GMT 12 via mobile Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by gavin on Sept 28, 2021 13:41:33 GMT 12 Hi, Car was certified with 225/65r17. Can I revert to 225/60r17 ie within 2.5% without having to have recertification.