The Ironman ? BOB's lightest stroller, designed for the serious runner ? offers superior on-road performance and responsive handling. A stiffer suspension maximizes maneuverability and response while jogging, and 16? aluminum wheels with high-pressure, slick road tires provide a smooth, seamless roll. The Ironman's caliper hand brakes help decrease speed while running on a decline, while the new foot-activated parking brake locks out the rear wheels when the stroller needs to be kept stationary.