represented by the Ford Gran Torino from Starsky & Hutch and the tuned imports from 2 Fast 2 Furious. RadioShack marketed a replica of Herbie that tied in with the Walt Disney Studios 2005 release of Herbie: Fully Loaded. In 2007, Radioshack released a set of ZipZaps for the live-action Transformers film, featuring Optimus Prime (the only model to feature a six-wheel chassis), Barricade, and Bumblebee. A series of monster trucks based on a larger chassis and with larger tires and motors and four wheel drive were available as well. The original ZipZaps operated on one of two frequencies: namely 27 MHz and 49 MHz, so no more than two people can reliably race simultaneously. The SE series and monster trucks featured selectable frequencies within the 27 MHz band for up to six racers along with working headlights and taillights. The SE series had proportional control and used a pistol grip style remote control. Motors, tires and wheel covers (called "hubs") were interchangeable between regular ZipZaps and the SE series. The bodies were also interchangeable, but the lights on SE bodies obviously did not work on the regular chassis. Accessories such as lap counters, autocross pylons and carrying cases were available as well. The popularity of ZipZaps waned somewhat in 2004 with RadioShack's introduction of XMODS. Like ZipZaps, XMODS offered customization options in both appearance and performance potential, but were considerably larger at 1:28 scale. XMODS Micro RC In October 2008, RadioShack relaunched the ZipZaps line – this time, as XMODS Micro RC. Only the name was changed; all parts were backwards and forwards-compatible between ZipZaps (except the light features of the SE line) and XMODS Micro RC lines, and used the same chassis and controller of the regular ZipZaps line (as opposed to the more advanced features of the SE line). See also Q-steer References Toy cars and trucks Radio-controlled cars Products introduced in 2002