You'd have to spend alot of money to get the traditional axle pegs. Most likely you'd have to have a new hub and it would be a cheapie which means you'd probably just buy a new rear wheel. Then you'd have to buy a new rear gearset that probably wouldn't work with your current rear derailer. Your new rear derailer probably wouldn't work with your current shifter either. The best and cheapest way to go about this would be to have "pegs" welded onto the frame.