Ames' group includes CarandDriver.com, RoadandTrack.com and Cycleworld.com, whose ad inventory will now be sold by Jumpstart.
Ames was formerly vice president, marketing director, of Hachette's Men's Enthusiast Network.
The Jumpstart deal was completed with an initial cash payment of $84 million. Additional consideration of up to a maximum amount of $26 million will be paid in 2008 and 2010 contingent on the attainment of certain specified earnings targets, the parties said.