Biggest. Baddest. Best....that's the SRT-XD and we are proud to call it ours. Meet the SRT-XD, a favorite in our Spartan lineup. The biggest Vanguard® 896cc and 993cc, 125 lb engines, along with the two 66 lb Parker HTG-16cc extreme duty transmissions and the five layers of Smart Ride Technology comfort put the SRT-XD at the top of the food chain for COMMERCIAL quality mowers.