With the AMA Holeshot Series Races coming to the short track at the end of May I have been asked by several racers what is the difference between a DTX bike and a Modifed bike. Basically the difference is changes that are made to a bike from OEM configuration that give a competetive advantage. With the exception of changing tires and wheels and suspension componants. DTX bikes must remain in oem configuration as far as the motor is concerned except for Reed valves, exhaust. The questions that have been asked are steering stabilizers and or handel bar replacement, does that mean that bike has to be ridden in the mod class. The answer is no. Those items may be added to a dtx bike. Modified would mean that you have modifed a motor coponant such as air box, carberator, head, cam, ect. You may not run a quick change rear wheel on a DTX bike but you may on a Mod bike. If you ride a Framer bike it may only be ridden in the Mod class. You may ride your DTX bike in both the DTX and the mod class.