Bike Reviews Video Review: The Pivot Mach 4 SL, in Action! By Matt Miller June 21, 2019 If you missed our first ride review of the new Pivot Mach 4 SL, or just want to see the bike in action, check out this video review. Share This: Tweet Matt Miller Matt is a staff writer at Singletracks and lives in the Front Range of Colorado. He served in the Marines and has a journalism degree from MSU-Denver. Subscribe! Enter your email address to receive our top stories via email each week.