Great thanks to the BookNook for bringing Werewolves of New Idria to my attention before the series was 2 or 3 volumes in….
A new breed of werewolf! Holy warriors, led by a 900-year-old knight who fought beside El Cid, now in a deadly struggle against a motorcycle gang headed by Satan's ken, hell bent on revenge! The Aceves family is like no other. With patriarch, Roberto Aceves, forever a Spanish knight after being bitten by a werewolf, he and his clan have secretly fought man's wars for 900 years. Today, near the abandoned mining town of New Idria, they must battle against a demon and his biker gang who want nothing more than to destroy the entire clan.