The specialized stumpjumper fsr is the quintessential trail bike building confidence through rowdy terrain like no other thanks to its refined and extremely capable design fully equipped with boost 148 and ample tyre clearance allowing you to switch between 29 and 275 sized wheels as you please for 2017 the specialized stumpjumper fsr comp 29er features the same great m5 alloy construction with its light and extremely durable nature creating a top compliant super stiff ri