I recently found out about a vintage flat track event somewhat locally, and have a spare 83 DR125. I've got no idea what makes a good flat tracker, so educate me! I'd like to avoid buying say a Champion frame, but I'm not opposed to chopping the frame to change the rake, or chopping up the swingarm. Are 19s the only way to go for flat track, or do I use 17s and grooved supermoto tires? Thanks for any and all help guys!