Manitou mastodon comp forks 15mmthe manitou mastodon comp forks provide all terrain trail suspension for your fat bike it has been specifically designed to handle the situational extremes that a fat bike must endure all temperature performancethe damper provides all temperature performance soaking up rough terrain rocks roots and big hits when riding across freezing cold snow as well as when riding on shimmering hot sand and everything in between featuresmaterial 6061 aluminium spring